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- COURIER HIGH SPEED MODEMS
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-
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- APPENDIX B. SUMMARIES AND TABLES
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-
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- CONTENTS
-
- The RS-232 Interface, with Pin
- Definitions
- Front Panel Indicators
- DIP Switch Summary
- Default Settings
- S-Register Summary
- ASCII Chart
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- Summaries and Tables B-1
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- COURIER HIGH SPEED MODEMS
-
-
-
- THE RS-232 INTERFACE
-
- DESCRIPTION
-
- The RS-232 interface is a standard
- developed by the Electronic Industries
- Association (EIA). It defines the
- signals and voltages used when data is
- exchanged between a computer or terminal
- and a modem or serial printer. Data is
- transmitted between the devices via a
- cable with 25-pin, 9-pin, 8-pin or
- custom-built connectors.
-
-
- PIN ASSIGNMENTS
-
- The entire standard covers many more
- functions than are used in most data
- communications applications. Pin
- assignments are factory set in the
- Courier to match the standard DB-25
- assignments in the following table. DB-
- 9 connectors for AT-compatible computers
- should be wired at the computer end of
- the cable as shown in the DB-9 column.
- If you're using an Apple computer, ask
- your dealer for the correct modem cable
- for your Apple computer model.
-
- Signal
- Flow
- DB-25 DB-9 Circuit Function D
- TE Ω DCE*
-
- 1 Ω AA Chassis
- Ground both directions
- 2 3 BA Transmitted Data to DCE
- 3 2 BB Received Data to DTE
- 4 7 CA Request to Send to DCE
- 5 8 CB Clear to Send to DTE
- 6 6 CC Data Set Ready to DTE
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- B-2 Summaries and Tables
-
- COURIER HIGH SPEED MODEMS
-
-
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- 7 5 AB Signal Ground both
- directions
- 8 1 CF Carrier Detect to DTE
- 12 Ω SCF Speed Indicate to DTE
- 15 Ω DB Synchronous TX** Timing t
- o DTE
- 17 Ω DD Synchronous RX** Timing t
- o DTE
- 20 4 CD Data Terminal Ready to DCE
- 22 9 CE Ring Indicate to DTE
- 24 Ω DA Synchronous TX** Timing t
- o DCE
-
- * DTE indicates the terminal or
- computer; DCE indicates the modem.
- ** Indicates Transmitter (TX) or
- Receiver (RX)
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- RS-232 Interface Pin Definitions
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- Summaries and Tables B-3
-
- COURIER HIGH SPEED MODEMS
-
-
-
- Minimum Requirements
-
- Some computer/terminal equipment
- supports only a few of the RS-232 signal
- functions set in the Courier. The
- minimum required for the modem to
- operate are as follows:
-
- Asynchronous Calls
-
- DB-25 DB-9
- Pin Pin Function
-
- 2 3 Transmitted
- Data
- 3 2 Received Data
- 7 5 Signal Ground
- 20 4 Data Terminal Ready*
-
- * Required only if you have the Data
- Terminal Ready Override switch OFF (DIP
- switch 1 UP).
-
- Synchronous Calls
-
- You will need all of the above functions
- as well as pin 15 for Transmitter timing
- signals, and pin 17 for Receiver timing
- signals. You may need pin 24, which is
- assigned the external timing source,
- rather than the internal (modem) source
- assigned to pin 15. See Chapter 7 for
- more detailed information.
-
- Additional Flow Control Functions
-
- If your computer and software support
- Clear to Send and you wish to use
- Transmit Data hardware flow control
- (&H1), Pin 5 (DB-25) or Pin 8 (DB-9) is
- required.
-
-
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- B-4 Summaries and Tables
-
- COURIER HIGH SPEED MODEMS
-
-
-
- If your computer and software support
- Request to Send and you wish to use
- Received Data hardware flow control
- (&R2), Pin 4 (DB-25) or Pin 7 (DB-9) is
- required.
-
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- FOR 38.4K DTE RATE
-
- Your terminal or computer must support
- the 38.4K rate. Make sure the RS-232
- cable is shielded. Cables are normally
- six feet long, but longer lengths are
- possible. If you encounter problems
- with signal degradation, try a shorter
- cable.
-
- If you decide to build your own cable,
- use a low-capacitance cable. To
- further minimize the capacitance,
- connect only those functions (pins) that
- your application requires.
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- Summaries and Tables B-5
-
- COURIER HIGH SPEED MODEMS
-
-
-
- FRONT PANEL INDICATORS
-
- SymbolMeaning Status
-
- HS High Speed All calls above 2400 bps: ON
- during call progress, after
- completion of dialing; OFF
- during HST-mode link
- negotiations at 2400 bps,
- then ON during connection.
- Remains ON after disconnect
- until next call is originated
- or answered.
-
- AA Auto Answer/ Answer mode only: ON when
- your modem is
- Answer in Auto Answer mode,
- and when answering a call; in
- HST mode, goes OFF if the
- channel is reversed and your
- answering modem transmits at
- 450 or 300 bps. Also goes
- OFF when the modem originates
- a call.
-
- CDCarrier Detect ON if DIP switch 6 is UP
- (factory setting) and the
- Courier receives a valid data
- signal (carrier) from a
- remote modem, indicating that
- data transmission is
- possible. Also ON when the
- CD override is on, DIP switch
- 6 DOWN.
-
- OH Off Hook ON when the Courier takes
- control of the phone line to
- establish a data link.
-
- RDReceived Data Flashes when the modem sends
- result codes or passes
- received data bits to the
- computer or terminal.
-
- B-6 Summaries and Tables
-
- COURIER HIGH SPEED MODEMS
-
-
-
- SD Send Data Flashes when the computer or
- terminal sends a data bit to
- the Courier.
-
- TRData Terminal ON if DIP switch 1 is UP
- (factory setting) and
- Ready the modem receives a DTR
- signal from the computer or
- terminal. Also ON when the
- DTR override is on, DIP
- switch 1 DOWN.
-
- MR Modem Ready/ ON when the Courier is
- powered on.
- Test Mode Flashes when the modems
- retrain, including online
- fallback, or while the modem
- is in Test mode.
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- Summaries and Tables B-7
-
- COURIER HIGH SPEED MODEMS
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- SymbolMeaning Status
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- RS Request to ON if your terminal or
- software supports RTS
- Send and sends the RTS signal.
- OFF if the Courier is set to
- &R2 (Received Data hardware
- flow control) and the
- computer or terminal lowers
- RTS.
-
- CSClear to Send ON until the modem lowers CTS
- when Transmit Data hardware
- flow control is enabled (&H1,
- &H3). Always ON during
- synchronous connections.
-
- ARQError Control Automatic Repeat Request. ON
- when the Courier is set to
- &M4 or &M5 and successfully
- connects with another modem
- under error control. Flashes
- when the Courier retransmits
- data to the remote modem.
-
- SYN Synchronous ON when the modem is set to
- &M1 and
- Mode enters synchronous mode.
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- B-8 Summaries and Tables
-
- COURIER HIGH SPEED MODEMS
-
-
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- DIP SWITCH SUMMARY
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-
-
- PURPOSE
-
- The DIP switches, located at the rear of
- the modem, are for adapting the modem to
- your equipment and personal require-
- ments. The Settings Supplement that
- comes with the modem indicates the
- recommended switch settings for many
- communications software packages. You
- may also want to experiment and review
- your software documentation as
- necessary.
-
- Some users are able to move a single
- switch with a finger tip. If this
- doesn't work for you, use a toothpick or
- other small instrument.
-
-
- OPERATIONS
-
- The DIP switch settings are power-on
- defaults, read by the Courier when it is
- turned on. If changed when the modem is
- on, switches 2-5, 7 and 9 require the
- ATZ (software reset) command to initiate
- the new settings. If you've set switch
- 8 UP to disable command recognition, and
- want to return the modem to Smart mode
- so that it responds to commands, you'll
- have to power off the modem, reset
- switch 8 DOWN, and power on the modem
- again. The remaining (hardware)
- switches are automatically operative
- when set UP or DOWN.
-
- Factory
- SwitchSetting Function
-
-
- Summaries and Tables B-9
-
- COURIER HIGH SPEED MODEMS
-
-
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-
- 1 OFF Data Terminal Ready Operations
- OFF Normal DTR operations:
- computer must provide DTR
- signal for modem to accept
- commands; dropping DTR
- terminates a call
- ON DTR always ON (Override)
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- 2 OFF Verbal/Numeric Result Codes
- OFF Verbal (word) results
- ON Numeric results
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- B-10 Summaries and Tables
-
- COURIER HIGH SPEED MODEMS
-
-
-
- Factory
- SwitchSetting Function
-
- 3 ON Result Code Display
- OFF Results suppressed
- ON Results enabled
-
- 4 OFF Command Mode Local Echo
- OFF Keyboard commands
- displayed
- ON Echo suppressed
-
- 5 ON Auto Answer
- OFF Modem answers on first
- ring
- ON Auto answer disabled
-
- 6 OFF Carrier Detect Operations
- OFF Courier sends CD signal
- when it connects with
- another modem, drops CD on
- disconnect
- ON CD always ON (Override)
-
- 7 OFF Auxiliary, DIP Switch 3 ON
- OFF Result codes in Originate
- and Answer mode
- ON Result codes in Answer
- mode disabled
-
- 8 ON AT Command Set Recognition
- OFF Command recognition
- disabled (Dumb Mode)
- ON Recognition enabled (Smart
- mode)
-
- 9 OFF Escape Code (+++) Response
- OFF Modem hangs up, returns to
- Command mode, sends NO
- CARRIER result
- ON Modem maintains
- connection, returns to
-
-
- Summaries and Tables B-11
-
- COURIER HIGH SPEED MODEMS
-
-
-
- Command mode, sends OK
- result
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- 10 OFF Power-on and ATZ Reset
- Software Defaults
- OFF Load from nonvolatile
- memory (NVRAM)
- IB Load factory settings from
- read only memory (ROM)
- continued
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- B-12 Summaries and Tables
-
- COURIER HIGH SPEED MODEMS
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- Factory
- SwitchSetting Function
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- QUAD OFF RS-232 Transmit/Receive Pin
- Assignments
- SWITCH OFF Normal assignments; see
- Pin Assignments in
- Appendix B-1
- ON Reversed Transmit/Receive
- pins
- The need to change this switch
- setting is rare. Carefully
- review your computer or
- terminal documentation before
- setting this switch DOWN.
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- Summaries and Tables B-13
-
- COURIER HIGH SPEED MODEMS
-
-
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- DEFAULT SETTINGS
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-
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- USER-PROGRAMMABLE DEFAULTS
-
- You can create your own default
- configuration and store it in
- nonvolatile random access memory (NVRAM)
- using the &W command described in
- Chapter 5. As long as DIP switch 10 is
- UP when you power on the modem, your
- defaults are loaded into the modem's
- random access memory (RAM). To view
- your NVRAM settings at any time, use the
- ATI5 command.
-
- Tables on the next two pages list the
- options you can store in NVRAM,
- including S-Register settings. If DIP
- switch 10 is DOWN at power-on, the
- factory settings listed in the table are
- loaded instead. The first time the
- modem is turned on, the NVRAM settings
- are the same as the factory settings.
-
- The following command example
- substitutes several user-defined
- defaults for factory settings. The
- modem also stores the rate, word length
- and parity it detects from the AT
- command prefix.
-
- AT X4 &B1 &M5 &H1 M3 &W <Enter>
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- B-14 Summaries and Tables
-
- COURIER HIGH SPEED MODEMS
-
-
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- NVRAM Options Factory Setting
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- Handshake option B0/B1 V.32 bis mode/HST
- mode
- Normal/error control modes &M4 Normal/ARQ
- Data compression &K1 Auto enable/disable
- Transmit data flow control &H0 Disabled
-
- Rec'd. data hardware flow control &R1 Ignore
- RTS
- Rec'd. data software flow control &I0 Disabl
- ed
- DTE rate select &B0 Detect from AT
- command; variable
- Link rate select &N0 Variable
-
- Result code subset X1 Extended
- Error-control response codes &A1 Enabled
- Tone/Pulse dialing P Pulse dial
- Online local echo F1 Disabled
- Speaker control M1 ON during dial
- through connect
-
- Remote Digital Loopback (RDL) &T5 Deny RDL
- Normal/Leased line &L0 Normal phone line
- Data Set Ready override&S0 Enabled
- Synchronous clock source&X0 Modem
- transmitter
- Break handling &Y1 Clear buffer, send
- immediately
-
- Stored telephone number&Z0-3=0 Blank
- Pulse dial make/break ratio &P0 U.S./Canada
- Guard tone &G0 U.S./Canada
- Rack Controller Unit (RCU) Access %R0 RCU
- access disabled
-
- Word length* 7
- Parity* 1 Even
- DTE rate* 19.2K
-
- * Detected by the modem from the AT
- prefix of the &W command that writes
-
- Summaries and Tables B-15
-
- COURIER HIGH SPEED MODEMS
-
-
-
- your defaults to NVRAM. Set your
- software to the desired word length,
- parity, and DTE rate defaults before
- sending the modem the AT . . . &W
- string.
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- B-16 Summaries and Tables
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- COURIER HIGH SPEED MODEMS
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- Factory
- NVRAM S-Register Options Setting
-
- S2 Escape code character 43
- S3 Carriage Return character13
- S4 Line Feed character 10
- S5 Backspace character 8
- S6 Dial wait-time, sec. 2
- S7 Carrier wait-time, sec. 60
- S8 Dial pause, sec. 2
- S9 Carrier Detect time, 1/10th sec.
- 6
- S10Carrier loss wait-time, 1/10th
- sec. 7
- S11Touch-Tone duration, spacing,
- msec. 70
- S12Escape code guard time, 1/50th
- sec. 50
- S13 Bit-mapped functions 0
- S15 Bit-mapped functions 0
- S19 Inactivity/hang up timer 0
- S21Break length, 1/100th msec. 1
- 0
- S22 XON character 1
- 7
- S23 XOFF character 1
- 9
- S24Pulsed DSR duration, 2/100th sec.
- 150
- S26RTS/CTS delay time, 1/100th sec.
- 0
- S27 Bit-mapped functions 0
- S28V.32 handshake time, 1/10th sec.
- 8
- S32 Talk/Data Switch Options 1
- S34 Bit-mapped functions 0
- S38 Disconnect wait time, sec. 0
-
- * Bit-mapped registers have up to eight
- functions. See Appendix B-5 in the
- manual or the briefer summary in the
- Quick Reference Card.
-
-
- Summaries and Tables B-17
-
- COURIER HIGH SPEED MODEMS
-
-
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- S-REGISTER SUMMARY
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-
-
- USAGE
-
- The default values are those users
- typically require. Change the settings
- with the ATSr=n command, where r is the
- register and n is a decimal value from
- 0-255:
-
- ATS13=8 <Enter>
-
- The modem does not perform a value-range
- check. Some values you select may not
- work with some equipment, and you'll
- have to readjust the settings.
-
- To display the contents of a register,
- use ATSr? as in this example:
-
- ATS20? <Enter>
-
- Register Default Function
-
- S0 See DIP Sets the number of rings
- on which to
- Switch 5 answer when in Auto Answer
- Mode. S0=0 disables Auto
- Answer, the same as DIP
- switch 5 DOWN (factory
- setting). S0=1 enables
- Auto Answer and the modem
- answers on the first ring.
-
- S1 0 Counts and stores the
- number of rings from an
- incoming call.
-
- S2 43 Stores the ASCII decimal
- code for the escape code
- character. Default
-
- B-18 Summaries and Tables
-
- COURIER HIGH SPEED MODEMS
-
-
-
- character is +++. A value
- of 128-255 disables the
- escape code.
-
- S3 13 Stores the ASCII decimal
- code for the Carriage
- Return character.
-
- S4 10 Stores the ASCII decimal
- code for the Line Feed
- character.
-
- S5 8 Stores the ASCII decimal
- code for the Backspace
- character. A value of
- 128-255 disables the
- Backspace key's delete
- function.
-
- Register Default Function
-
- S6 2 Sets the number of seconds
- the modem waits before
- dialing. If set to X2,
- X4, or X6, the modem
- ignores this register and
- dials as soon as it
- detects a dial tone (fast
- dials).
-
- S7 60 Sets the number of seconds
- the modem waits for a
- carrier. May be set for
- much longer duration if,
- for example, the modem is
- originating an
- international connection.
-
- S8 2 Sets the duration, in
- seconds, for the pause (,)
- option in the Dial command
- and the pause between
-
-
- Summaries and Tables B-19
-
- COURIER HIGH SPEED MODEMS
-
-
-
- command re-executions (>
- and A> commands).
-
- S9 6 Sets the required
- duration, in tenths of a
- second, of the remote
- modem's carrier signal
- before recognition by the
- Courier.
-
- S10 14 Sets the duration, in
- tenths of a second, that
- the modem waits after loss
- of carrier before hanging
- up. This guard time
- allows the modem to
- distinguish between a line
- hit, or other disturbance
- that momentarily breaks
- the connection, from a
- true disconnect (hanging
- up) by the remote modem.
-
- While we do not recommend
- connecting the modem to a
- line with call waiting, if
- you have call waiting you
- may wish to adjust this
- setting upward to prevent
- the modem from
- misinterpreting the signal
- for a second call as a
- disconnect by the remote
- modem. A better
- alternative is to contact
- your phone company to find
- out how to temporarily
- disable call waiting.
-
- S11 70 Sets the duration and
- spacing, in milliseconds,
- of dialed Touch-Tones.
-
-
- B-20 Summaries and Tables
-
- COURIER HIGH SPEED MODEMS
-
-
-
- S12 50 Sets the duration, in
- fiftieths of a second, of
- the guard time for the
- escape code (+++)
- sequence.
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- Summaries and Tables B-21
-
- COURIER HIGH SPEED MODEMS
-
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- Register Default Function
-
- S13 0 Bit-mapped register.
- Select the bit(s) you want
- on and set S13 to the
- total of the values in the
- Value column. For
- example, ATS13=20 enables
- bit 2 (value = 4) and bit
- 4 (value = 16).
-
- BitValue Result
- 0 1 Reset when DTR
- drops
- 1 2 Reverse normal Auto
- Answer operation:
- on incoming RING,
- enter Originate
- Mode and look for
- Answer tone
- 2 4 Disable 250 msec.
- pause before result
- code display
- 3 8 On DTR signal, Auto
- Dial the number
- stored in NVRAM at
- position 0
- 4 16 At power on/reset,
- Auto Dial number
- stored in NVRAM at
- position 0
- 5 32 Disable HST (used
- for testing V.32
- bis in Dual
- Standard modems)
- 6 64 Disable MNP Level 3
- (used for testing
- Level 2)
- 7 128 Custom applications
-
- S14 0 Reserved.
-
-
-
- B-22 Summaries and Tables
-
- COURIER HIGH SPEED MODEMS
-
-
-
- Register Default Function
-
- S15 0 Bit-mapped register. To
- set the register, see the
- instructions for S13.
-
- BitValue Result
- 0 1 Disable the modem's
- extra high-
- frequency
- equalization if it
- causes problems on
- shorter-link
- callsΩHST modems
- only
- 1 2 Disable online
- fallback
- 2 4 Disable 450 bps
- back channel
- 3 8 Reset non-ARQ mode
- Transmit buffer
- from 1.5K bytes to
- 128*
- 4 16 Disable MNP Level
- 4; retransmitting
- the larger Level 4
- data blocks may be
- a problem if you
- expect a great
- number of errors
- during a call
- 5 32 Set backspace key
- to delete
- 6 64 Some earlier 2400-
- bps MNP modems, not
- made by USRobotics
- or Microcom, were
- not fully
- compatible with the
- MNP protocol. If
- you have difficulty
- making a successful
- 2400-bps MNP
-
- Summaries and Tables B-23
-
- COURIER HIGH SPEED MODEMS
-
-
-
- connection with a
- remote MNP modem,
- it may be because
- of this incompati-
- bility. Set S15 to
- 64 and try again to
- make the
- connection.
- 7 128 Custom applications
- only
-
- * The default 1.5K byte non-ARQ buffer
- allows data transfer with X- and Ymodem-
- type file transfer protocols without
- using flow control.
-
- The 128-byte option allows remote users
- with slower modems to stop data you're
- transmitting from scrolling off their
- screens. When remote users send your
- computer an XOFF (Ctrl-S) and you stop
- transmitting, the data in transit from
- your modem's buffer doesn't exceed the
- size of their screen.
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- B-24 Summaries and Tables
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- COURIER HIGH SPEED MODEMS
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- Register Default Function
-
- S16 0 Bit-mapped test register.
- To set the register, see
- the instructions for S13.
- For information on
- testing, see Appendix F.
-
- BitValue Result
- 0 1 Analog Loopback
- 1 2 Dial test
- 2 4 Test pattern
- 3 8 Remote Digital
- Loopback
- 4 16 Reserved
- 5 32 Reserved
- 6 64 Reserved
-
- S17 0 Reserved.
-
- S18 0 Test timer for software-
- initiated loopback testing
- (&Tn), disabled when S18
- is set to 0. See Appendix
- F. Used to set the
- duration of testing, in
- seconds, before the modem
- automatically times out
- and terminates the test.
-
- S19 0 Sets the duration, in
- minutes, for the
- Inactivity Timer. The
- timer activates when there
- is no data activity on the
- phone line and at the
- timeout the modem hangs
- up. S19=0 disables the
- timer.
-
- S20 0 Reserved.
-
-
-
- Summaries and Tables B-25
-
- COURIER HIGH SPEED MODEMS
-
-
-
- S21 10 Sets, in 10-millisecond
- units, the length of
- Breaks sent from the modem
- to the DTE. Applies to
- ARQ mode only.
-
- S22 17 Stores the ASCII decimal
- code for the XON
- character.
-
- S23 19 Stores the ASCII decimal
- code for the XOFF
- character.
-
- S24 150 Sets the duration, in 20-
- millisecond units, between
- pulsed DSR signals when
- the modem is set to &S2 or
- &S3. The default is 3
- seconds.
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- B-26 Summaries and Tables
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- COURIER HIGH SPEED MODEMS
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-
-
- Register Default Function
-
- S25 0 Reserved.
-
- S26 1 Sets the duration, in 10-
- millisecond units, of the
- delay between RTS and the
- modem's CTS response in
- synchronous mode.
-
- S27 0 Bit-mapped register. To
- set the register, see the
- instructions for S13.
-
- BitValue Result
- 0 1 Enable CCITT V.21
- modulation at 300
- bps for overseas
- calls. In V.21
- mode, the modem an-
- swers both Bell 103
- and V.21 calls, but
- only originates
- V.21 calls.
- 1 2 Enable unencoded
- (non-trellis-coded)
- modulation in V.32
- mode; this option
- is part of the
- CCITT V.32
- recommendation, but
- is rarely used.
- 2 4 Disable V.32
- modulation; used
- for testing HST
- modulation in Dual
- Standard modems.
- 3 8 Disable 2100 Hz
- answer tone to
- allow two V.42
- modems to connect
- more quickly.
- 4 16 See below.
-
- Summaries and Tables B-27
-
- COURIER HIGH SPEED MODEMS
-
-
-
- 5 32 See below.
- 6 64 Reserved.
- 7 128 Unusual software
- incompatibility.
- Some software may
- not accept 7200,
- 12000 and 14400 bps
- result codes. This
- setting disables
- the codes and
- displays the 9600
- code instead. The
- call's actual rate
- can be viewed on
- the ATI6 screen.
- continued on following page
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- B-28 Summaries and Tables
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- COURIER HIGH SPEED MODEMS
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-
-
- Register Default Function
-
- Error control handshaking
- options: select the total
- values of bits 4 and 5.
-
- Bit 4Bit 5 Result
- 0 0 Complete
- handshaking
- sequence: V.42
- Detection, LAPM
- error control, MNP.
- 16 0 Disable MNP.
- 0 32 Disable V.42
- Detection and LAPM.
- 16 32 Disable Detection
- phase, if you know
- that the remote
- modem does LAPM,
- but not the
- Detection phase.
-
- S28 8 Sets the duration, in
- tenths of a second, of the
- extra 3000/600 Hz answer
- tones sent during V.32
- handshaking. Default = 8
- (.8 seconds). This gives
- V.32 modems additional
- time to connect in V.32
- mode before timing out.
-
- If there is difficulty
- answering older, manually
- operated V.32 modems, for
- example, modems that
- require a button to be
- pushed in order to dial,
- try lengthening the
- duration of the extra
- tones.
-
-
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- Summaries and Tables B-29
-
- COURIER HIGH SPEED MODEMS
-
-
-
- Setting S28 to zero
- eliminates the extra
- tones, resulting in a
- faster connect time if,
- for example, the modem is
- set to use V.21 modulation
- (300 bps) or V.23
- modulation (1200 bps).Sets
- the duration, in 1/10ths
- of a second, of the V.32
- handshake.
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- B-30 Summaries and Tables
-
- COURIER HIGH SPEED MODEMS
-
-
-
- Register Default Function
-
- S32 1 Sets the function for the
- Voice/Data switch. This
- is not a bit-mapped
- register. Select the
- value for the desired
- function, for example,
- ATS32=6.
-
- Value Result
- 0 Disabled
- 1 Voice/data,
- Originate mode
- 2 Voice/data, Answer
- mode
- 3 Redial last number
- 4 Dial number stored
- at
- position 0
- 5 Auto Answer on/off
- toggle
- 6 Reset the modem
- 7 Initiate Remote
- Digital Loopback
-
- S34 0 Bit-mapped register. See
- instructions for S13.
-
- BitValue Result
- 0 1 Disable V.32 bis.
- Used for
- troubleshooting;
- USRobotics'
- Technical Support
- may require that
- you disable V.32
- bis for testing
- purposes.
- 1 2 Disable the modem's
- enhanced, propri-
- etary V.32 bis
- modulation. Used
-
- Summaries and Tables B-31
-
- COURIER HIGH SPEED MODEMS
-
-
-
- for
- troubleshooting.
- 2 4 Disable the faster
- retrains that occur
- during proprietary
- V.32 bis
- modulation. Used
- for trou-
- bleshooting.
- 3 8 Enable V.23.
- Required for some
- British
- connections.
- 4 16 Change MR LED to
- DSR
- 5 32 Enable MI/MIC; see
- Appendix E-5.
- 6 64 Reserved
- 7 128 Reserved
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- B-32 Summaries and Tables
-
- COURIER HIGH SPEED MODEMS
-
-
-
- Register Default Function
-
- S38 0 Sets the duration, in
- seconds, before a forced
- hang-up and clearing of
- the Transmit buffer, when
- DTR drops during an ARQ
- call. This is provided to
- allow time for a remote
- modem to acknowledge
- receipt of all transmitted
- data. Default = 0: the
- modem immediately hangs up
- when DTR drops. If the
- modem receives the ATH
- command, it ignores S38
- and immediately hangs up.
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- Summaries and Tables B-33
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- COURIER HIGH SPEED MODEMS
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- ASCII CHART
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- B-34 Summaries and Tables
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