Troubleshooting Terminal, Printer, and Serial Device Connections - Edition 5 (32022-90058)
Troubleshooting Procedures
Troubleshooting the Device
Chapter 2
28
Troubleshooting the Device
Most problems can be diagnosed and/or resolved quickly at the device (terminal or serial
printer). It’s best to do simple verifications before using TermDSM for more involved
diagnostics. First, note the following:
• How many devices are affected?
• Which devices are affected?
The number and proximity of devices affected provides a clue to the cause. If all devices
are affected, the fault is likely to be with the system. If several devices on a DTC are
affected, the DTC is suspect. If all devices on a DTC are down, the DTC or LAN might be
at fault.
If only one device is affected, the fault is likely in that device, the device cable, or the
DTC components (hardware or software) that serve the device. If only one device is
affected, verify that:
• The serial interface is connected.
• The power cord is connected and is powered on.
If the device is “hung” (the port is not responding), do the following:
• Press
[CONTROL]-Q
.
• Check that the device is in remote mode.
• Attempt a soft reset. Press
[SHFT]-Reset
.
• Attempt a hard reset. Press
[CTRL]-Reset
.
If the device is not hung, but transmission or reception is “garbled”, check that speed and
parity sensing is enabled. Also check that the XON/XOFF protocol is enabled. If the user
cannot logon, check that the device is configured correctly.