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Troubleshooting
TM-XR9B-01XN 3–23
RS-232 Mode Troubleshooting Tips
RS-232 and/or Ethernet Mode Troubleshooting Tips
Table 3-11
RS-232 Mode Tips
Cannot establish
communication
Using straight through
RS-232 cable instead of
Null Modem cable
Loose cables
Baud rate mismatch
Trying to communicate via
the wrong COM port
The interface card is
configured for Ethernet
communications
Use a Null Modem cable
Ensure that the cables are securely connected to
the computer and the power supply.
Select a baud rate that matches the instruments
settings. See “Baud Rate Selection” on page 2–
18 for details on changing this setting.
Most computers have two COM ports, COM1
and COM2, so ensure you have selected the
correct COM port.
Reconfigure the interface card for RS-232
communications. See “Configuring for Ethernet
or RS-232” on page 2–12 for details.
Table 3-12
RS-232 and/or Ethernet Mode Tips
Instrument not
responding to new
user settings
The unit is in local mode Put the unit into remote mode by sending the
command REN ON.
The output is
displaying zero
volts and zero amps,
but the setpoints are
non-zero
The output is off
The output has tripped due
to an OVP, or foldback
protection event
Send the command OUT ON
Correct the condition that has caused the fault,
and send the command RST
TM-XR9B-01XN.book Page 23 Monday, April 19, 2004 9:00 AM