Troubleshooting Terminal, Printer, and Serial Device Connections - Edition 5 (32022-90058)

Troubleshooting Procedures
Testing DTC Device Connections
Chapter 2
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• If the test fails, the fault is in the DTC (refer to “Testing the DTC” later in this
chapter).
• If the test passes, do the Terminal Write/Read Test.
2. Terminal Write/Read Test.
• If the test fails, and a loopback connector is available, do the External Port
Loopback Test.
• If the test fails, but no loopback connector is available, alternate testing is
required (fault might be in the DTC, the device, or the device cable).
• If the test passes, the fault is in the software.
3. External Port Loopback Test.
• If the test fails, the fault is in the DTC (refer to “Testing the DTC” later in this
chapter).
• If the test passes, the fault is in the device cable or the device.
The test sequence to use for printers or unsupported devices is as follows:
1. Internal Port Loopback Test.
• If the test fails, the fault is in the DTC (refer to “Testing the DTC” later in this
chapter).
• If the test passes, but no loopback connector is available, alternate testing is
required (fault might be in the DTC, the device, or the device cable).
• If the test passes, and a loopback connector is available, do the External Port
Loopback Test.
2. External Port Loopback Test.
• If the test fails, the fault is in the DTC (refer to “Testing the DTC” later in this
chapter).
• If the test passes, do the Print-to-Port Test.
3. Print-to-Port Test.
• If the test fails, the fault is in the device or the device cable.
• If the test passes, the fault is in the inbound data path of the device or in the
device cable.