© National Instruments
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GPIB-140A User Manual
Step 4. Verify the Connection
Each GPIB extender has a self test that determines whether the GPIB extender receivers,
transmitters, and packet transmission and reception circuitry are working properly.
To run the self test, complete the following steps:
1.
Power off the GPIB extender.
2.
Disconnect the fiber-optic cable from the GPIB extender.
3.
Power on the GPIB extender.
The
POWER
LED lights, indicating that power is supplied to the extender. The
LINK
LED remains off.
4.
Connect the connector marked T (transmit) on one end of the fiber-optic cable to the
connector marked TRANS on the side panel of the GPIB extender.
5.
Connect the connector marked R (receive) on the opposite end of the fiber-optic cable to
the connector marked RCVR on the side panel of the GPIB extender.
Figure 2-3.
GPIB Extender Self-Test Configuration
The
LINK
LED lights, indicating that the cable is connected. The
ERROR
LED should
remain off, indicating that the GPIB extender is working properly.
6.
If the
ERROR
LED does not remain off, complete the following steps to solve the problem:
a.
Verify that the fiber-optic cable is connected to the GPIB extender, as described in
steps 4 and 5. If the problem persists, continue to the next step.
b.
Repeat steps 4 and 5 using the unconnected ends of the fiber-optic cable. If switching
the fiber-optic cable connectors solves the problem, you need to replace your
fiber-optic cable. To order a new fiber-optic cable, contact National Instruments. If
switching the fiber-optic cable connectors does not solve the problem, continue to the
next step.
c.
If possible, repeat steps 4 and 5 using a different fiber-optic cable. If the problem
persists, you might need to replace your GPIB extender. For more information, contact
National Instruments.
GPIB-140A or
GPIB-140A/2
Fi
b
er-Optic
C
ab
le
TRAN
S
RCVR
R
R
T
T
