Troubleshooting Terminal, Printer and Serial Device Connections - Edition 4 (32022-90030)

26 Chapter 2

Troubleshooting Procedures

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.