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Aminet AMIGA CDROM (1994)(Walnut Creek)[Feb 1994][W.O. 44790-1].iso
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SEVEN.TXT
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1993-05-10
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COURIER HST
CHAPTER 7
QUERIES AND HELP SCREENS
USER INQUIRIES (In)
The Inquiry command has eight options. The most commonly used
options display the following information:
ATI3 Call duration
ATI4 Current settings
ATI5 NRAM settings
ATI6 HST link diagnostics summary
I0 The modem returns a 3-digit product code. If you have a
problem and call USRobotics' Technical Support Department,
you may be asked for this product code.
I1 The modem performs a checksum of its read only memory (ROM)
and returns the result to the screen. This function is used
only in factory testing. The modem should always read the
same number.
I2 The modem performs a test of its random access memory (RAM)
and returns either the OK (0) or ERROR (4) result code,
followed by OK when the test is completed. You may want to
use this command as a checkpoint if the modem appears to be
malfunctioning.
I3 The modem returns the duration of the last call if set the
K0. It displays the actual time if set to K1. See the
description of the Kn command in Chapter 5.
I4 The modem displays its current configuration. The following
illustration is an example.
Figure 7.1 -- Sample Result of ATI4 Command
I5 The modem displays the configuration stored in nonvolatile
random access memory (NRAM).
Figure 7.2 -- Sample NRAM Settings Screen
I6 During a connection, the modem monitors and stores
information about link operations. When the call is ended,
you can request a diagnostic summary, as in the following
example.
7-1
COURIER HST
Figure 7.3 -- Sample Link Diagnostics Screen (ATI6)
Terms used in the display are self-explanatory except for
the following:
Octets Compressed characters
Blers Errors in protocol (non-data) blocks
Link Naks Negative acknowledgments (one or more
blocks)
Link Timeouts Protocol operations, not the retry
timeout; used in internal testing
Data Compression On/Off: indicates if data compression
was negotiated for the call
Equalization Long/Short: status of S15 bit 0; long if
bit 0=0, short if bit 0=1
Fallback Enabled/Disabled: indicates whether or
not the modems negotiated online
fallback during the connection sequence
I7 The modem returns a product configuration. If you have a
problem and call USRobotics' Technical Support, you may be
asked to read this screen.
S-REGISTER QUERY (Sr?)
This command allows you to view the contents of a particular S-
Register, as in the following example that requests the contents
of register S0 ("On what ring will the modem answer?"):
ATS0? <Enter>
Most registers store values that can be user-defined. However,
two registers that are not user-programmable can be queried for
the following diagnostic information.
S17 The reason for a Link Disconnect when two modems try to make
an ARQ connection and fail, or when the remote modem
disconnects from an ARQ session. S17 is used for debugging
purposes. If you're having an ARQ-compatibility problem and
call USRobotics' Technical Support, you may be asked to
check S17.
S20 The reason for a NO CARRIER result code when the modem is in
either ARQ or Normal Mode. Reasons include user aborts
(pressing <any key> during dialing), loss of carrier, and
the automatic hangup that occurs when the modem is set to
&M5 and calls a modem not operating under error control.
7-2
COURIER HST
PHONE NUMBER QUERY (&Zn?)
At this command, the modem returns the phone number stored in
NRAM at position n, as in the following example that includes a
sample modem response:
AT&Z3? <Enter>
5551234
HELP SCREENS
The Courier HST provides four Help screens: summaries of the
basic AT command set, extended ampersand (&) command set, S-
register functions, and Dial command options.
Stop/Restart Display
The following command stops the display. Hold down the Control
key and type "S":
<Ctrl>-S
To restart the display, use the same command or press <any key>.
Cancel Display
Either of the following commands cancels the display.
<Ctrl>-C
<Ctrl>-K
Basic Command Set ($)
At AT$, the Courier displays this command set summary:
Figure 7.4 -- Basic Commands HELP Screen
Extended Command Set (&$)
At AT&$, the Courier displays this summary of the ampersand
command set:
Figure 7.5 -- Ampersand Commands HELP Screen
7-3
COURIER HST
S-Register Functions (S$)
At ATS$, the Courier displays a summary of the S-register
functions:
Figure 7.6 -- S-Register HELP Screen
Dialing (D$)
At ATD$, the Courier displays this Dial command summary:
Figure 7.7 -- Dial Command HELP Screen
7-4