CHAPTER 9: Diagnostics
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A remotely attached terminal or printer does not communicate with the LinkUp 5294.
1. Ensure that the terminal/printer, the LinkUp 5294, and modems are all configured to support the
same baud rates.
2. Make sure the modem attached to the LinkUp 5294 is configured as follows:
A. To ignore modem commands.
B. Not to echo received characters.
For switched lines, the modem must also be configured as follows:
C. An auto-answer modem must pass RI (Ring Indicator, Pin 22) to the LinkUp 5294, and allow the
LinkUp 5294 to raise DTR in response to RI.
D. Loss of Carrier Detect must be enable. (causes modem to drop DSR if line becomes
disconnected).
E. External DTR must be enabled, (Data Terminal Ready, Pin 20) control. Causes modem to
disconnect from phone line if the LinkUp 5294 drops DTR.
3. The LinkUp 5294 requires RI (Ring Indicator) when used with auto-answer modems.
4. Make sure the asynchronous port of the LinkUp 5294 is configured as DTE (a remote connection).
The Host does not poll the LinkUp 5294.
1. Confirm that the host is on-line.
2. REMOTE CONNECT: Make sure the Sync port is configured for DTE. Also make sure that the BIT
RATE is set for EXT.
3. DIRECT CONNECT: Make sure the Sync port is configured for DCE. Also make sure the BIT RATE
is set for a specific rate (in keeping with the host configuration).
4. Review the LinkUp 5294 Sync port configuration with that of the Host systems. Pay particular
attention to Control Unit Address, HALF/FULL DUPLEX, NRZI, and CLOCKING.
5. Ensure that the RS-232C cable for the Sync port has, at a minimum, the following Pins: 1 through 8,
l5, 17, 20, and 22.
6. Ensure that a hardware reset has been performed since the last synchronous port changes were
made.
The Host is polling the LinkUp 5294, but the terminal does not receive a sign-on screen. Or instead, a
0099 error occurs.
1.
Confirm that the host is indeed on-line. If yours is a remote connection, this necessitates calling the
host and the LinkUp 5294 site.
2.
Normally this means the LU (Logical Unit) you are trying to access the Host through has not been
assigned to a valid Host Workstation ID. This may be because:
A.
The valid Host address (LSID) has not been assigned to the LinkUp 5294 Logical Unit (LU)
through the LinkUp 5294 Configurator Mode.
B.
The Host address (LSID) assigned to the LinkUp 5294 Logical Unit (LU) has not been assigned
on the host system (meaning it is an invalid LSID).
