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- x1k1
- ┌──────────────────────────────────────────┐
- │ │
- │ The Norton Commander, V3.0 │
- │ Commander Link and Mail │
- │ Trouble-Shooting Suggestions │
- │ │
- └──────────────────────────────────────────┘
-
-
- If you are having problems with either the Link or the MCI Mail
- portion of the Norton Commander, the problems may be due to the
- configuration of your serial communications adapter. These problems
- could manifest themselves in one of the following ways:
-
- Link:
- Inability to establish connection to other computer: Verify that
- the connection is to the correct serial port, and is connected through a
- null-modem cable.
-
- Extremely high resend rate: try reducing the line noise (described
- below), or try switching out of "Turbo" mode. (See "Turbo-mode Notes"
- below).
-
- The error message "The COM# port is not available.": the serial
- port is not responding. Try using the other setting (COM2: vs COM1:).
- You may have a serial port in your computer that has been deactivated
- (perhaps for an internal modem that was later removed), so you may wish
- to try using a different port.
-
- Mail:
- "Modem did not respond": This is generated when an invalid
- serial port was chosen. Using a valid serial port with no
- modem attached leads to a "Session Complete" message instead. Try
- configuring the program for a different port.
-
-
- ******************************************
- * Diagnosing the serial port *
- ******************************************
-
- The easiest way to determine if the serial port is responding
- properly is to try using it. If it works, it works. To help with
- this, we have included a program called Ser-Test.EXE. We suggest you
- not use it unless necessary because it will reset all of your
- serial ports, messing up whatever mouse drivers are present. This
- program will tell you how many serial ports your computer thinks it
- has, their allocated addresses, and if they are responding. It also
- makes a stab at determining where there are active modems, but due to
- the many different ways modems can be set up and the other types of
- serial equipment out there, this is not to be considered definative.
- This program will NOT tell you whether the IRQs are properly matched
- to the COM numbers.
-
-
-
-
- If you have a diagnostics disk for your PC or AT, and if you have
- problems using or accessing the serial ports, you should run the
- diagnostics. (Alternatively, you may see one of the following messages at
- boot-up, but this is unlikely since serial ports are counted at boot-up,
- rather than before in hardware the way video and disk drives are). The
- error messages to look for span from 1100 to 1157 for COM1: and from 1200
- to 1257 for COM2:. They include:
- XX00: Everything seems to be O.K.
- XX01: Adapter failure
- XX42: Problem with IRQ4
- XX43: Problem with IRQ3
-
- There are many other messages, but these are the most likely
- serial-port specific errors you may run into. Other error messages, such
- as XX11 and XX14, may occur if you have a modem attached (those are "Ring
- Detect" and "Data Signal Ready".)
-
- If you run into any other error numbers, either look them up in a
- Technical Reference Manual or ask your service person- there may be a
- problem with some other area of your system.
-
- If you receive either a 4800 or a 4801 (or 4900/4901), you have an IBM
- modem. The 4801 would indicate that this modem is in fact not working
- properly, which is a moot point at best. Most programs, including the
- Commander, are preconfigured to work only with Hayes compatible modems (of
- which this is not one), so we suggest you purchase a new modem if you wish
- to use the MCI Mail portion of the program. (480X would be on COM1:,
- 490X would be on COM2:)
-
-
- ****************************************************
- * Non-serial-port problems with MCI Mail: *
- ****************************************************
-
- "Session Complete" before anything has been done: the modem
- setting may be too fast for the modem: i.e. you may have configured the
- program to send characters at 2400 baud to a 1200 buad modem. Also,
- modem may not be properly attached to the computer, may not be turned on,
- or simply may be misconfigured so as not to be recognized.
-
- Dials and then "No Carrier or Busy.": the telephone line may
- be busy, it may not have reset from the last call (if it was not
- properly hung up), or the modem may not be properly attached to the
- phone line. If all of these have been checked, try a different phone
- number for MCI, and then go to the "minimizing noise" section of this
- file.
-
- If the problem with Mail is that the modem is not hanging up and you
- are using a 2400 baud modem, you should add two commands to the modem
- initialization string: &C1 &D2
-
-
- *****************************************************
- * Cable Specifications for the Commander Link: *
- *****************************************************
-
- If the problem is with Link, first make certain that you are
- using the correct type of cable: a null-modem cable (3-wire, although
- 7-wire will work). Null-modem cables have pins two and three crossed,
- and are straight pass-through for pin seven (DB-25 connector
- numbers). Pins two and three are reversed on the nine-pin connectors,
- and pin seven on the DB-25 is connected to pin five on the DB-9.
-
-
-
-
-
- *****************************************************
- * Turbo-Mode and Speed Notes (Commander Link): *
- *****************************************************
-
- The Turbo Mode refers to the speed that characters are sent. The
- speed of reception is not affected. This is a different speed measurement
- than that of the baud rate.
- The baud rate refers to the speed that the serial port is run at.
- This is the maximum speed that characters can be sent at. Non-Turbo mode
- inserts an extra delay between characters to aid in the recognition of the
- characters. If the characters are sent before the other computer is ready
- for them, some of the data can be lost. This loss is recognized by our
- error-checking, and the data is resent (the NAK'd and resent numbers on
- the slave computer), but the resend rate rate speeds up the transfer rate.
-
- When running a 386 to an 8086, if you receive many NAK'd errors (if
- the 8086 is the slave), you should switch "Turbo" OFF on the 386 computer,
- leaving Turbo ON on the 8086 computer. Doing this can increase the
- transfer rate by a factor of two, if the error rate was around 10%!
-
- Some computers, such as the IBM PS/2 386 models (70 and 80) can not
- run the serial port at 115,200 baud. They must be run at 57K instead.
- However, even at 57KB, one or both of the computers may need to be taken
- out of Turbo mode.
-
- NOTE: TURBO and NON-TURBO modes refer to the Link dialog box. They do NOT
- refer to the speed of the computer on which they are running, such
- as a Turbo-XT.
-
- ***********************************
- * Serial Port Solutions: *
- ***********************************
-
- The serial ports MUST be configured for COM1: on IRQ4, and
- COM2: on IRQ3. Although some programs support COM3 and COM4 (which
- should be configured on IRQ4 and IRQ3 respectively), we do not:
- versions of DOS prior to 3.3 did not explicitly support these ports,
- nor did the ROM-BIOS of computers prior to the PS/2 series.
-
- Examine your AUTOEXEC.BAT file for "mode" commands and
- printer drivers that are sending data to the serial ports (most
- likely if you have an older LaserJet).
-
- Check for mouse drivers. In general, mouse drivers will not
- install themselves if a mouse was not found at boot-up, but some may.
- The mouse driver will install itself if it saw the mouse. When the
- mouse driver is installed, it expects control of the serial port, and
- may cause some problems with our program if you plug the modem into
- the same port the mouse was in. (This only applies to serial mice.
- PS/2 and Bus mice do not share this problem.)
-
-
-
-
-
- ******************************
- * Minimizing Noise: *
- ******************************
-
- 1) Use a shielded RS-232 cable (a round cable) instead of a
- ribbon (flat) cable, either as your null-modem cable or to connect the
- modem to your computer (not an issue with internal modems).
- 2) Keep the cables as far away from the monitor and power
- supply as possible.
- 3) If line noise still persists, try turning off all other
- electrical appliances (especially televisions and florescent lights)
- to see if that eliminates the problem. If so, turn them back on a
- few at a time until you find the offending units.
- 4) You may not be able to do anything about it: some
- switching stations are noisier than others (the noise may come from
- the phone company). Try calling numbers in different areas. If this
- fails, it may be the line and station that your dwelling is routed
- through.
- 5) As always, make certain that all connections are tightly
- attached.
-
-
-