Chapter 3 Front-Panel Operation
RS-232 Interface Configuration
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The power supply monitors the DSR line to dete rmine when the bus controller
is ready to accept data over the interface. The power supply monitors the DSR
line (pin 6 on the RS-23 2 connector) before each c haracter is sent. The output
is suspended if the DSR line is FALSE. W hen the DSR line goes TRUE,
transmission will resume.
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 acti on).
For the <Ctrl-C> character to be recognized reliably by the power supply
while it holds DTR FALS E, the bus con troll er m us t first set DSR FALS E.
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 w ith your compu ter.
• 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 h as the proper connectors for your system, the internal
wiring may be incorre ct. The
HP 34398A Cable Kit
can be used to connect
the power supply to most computers or terminals.
• Verify that you have connected the interfac e cable to the correct seria l port
on your computer (C OM1, C OM2, etc).
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