Chapter 3 Front-Panel Operation
RS-232 Interface Configuration
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The power supply holds the DTR line FALSE while output is suspended. A form of
interface deadlock exists until the bus controller asserts the DSR line TRUE to allow
the power supply to complete the transmission. You can break the interface deadlock
by sending the <Ctrl-C> character, which clears the operation in progress and
discards pending output (this is equivalent to the IEEE-488 device clear action).
For the <Ctrl-C> character to be recognized reliably by the power supply while it
holds DTR FALSE, the bus controller must first set DSR FALSE.
RS-232 Troubleshooting
Here are a few things to check if you are having problems communicating over the
RS-232 interface. If you need additional help, refer to the documentation that came
with your computer.
• Verify that the power supply and your computer are configured for the same baud
rate, parity, and number of data bits. Make sure that your computer is set up for 1
start bit and 2 stop bits (these values are fixed on the power supply).
• Make sure to execute the SYSTem:REMote command to place the power supply
in the remote mode.
• Verify that you have connected the correct interface cable and adapters. Even if
the cable has the proper connectors for your system, the internal wiring may be
incorrect. The HP 34398A Cable Kit can be used to connect the power supply to
most computers or terminals.
• Verify that you have connected the interface cable to the correct serial port on your
computer (COM1, COM2, etc).
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