User and Programming Manual - Rev H
California Instruments
May 2000
P Series
42
Symptoms:
1. Unable to verify connection to the power source through RS232C interface. Timeout occurs
and dialog box appears that asks if you want to switch to simulation mode. An error
message (ERR -100) may appear on the front panel LCD’s of the power source.
- Or -
2. Verification is successful but slewing of voltage, frequency or current limit results in an
ERR -100.
Things to check first:
1. Is the PC com port you selected to use really available for this purpose? On older PC’s
com port interrupts are often shared between com 1 and com3 as well as com2 and com
4. If any of these other com ports is in use, it may prevent you from using the com port
that shares the same interrupt.
2. Did you use the RS232C cable that was supplied with the P/RP AC source? This is not a
null-modem cable and cannot easily be obtained at a computer store. If you do not have
the original cable, consult the PGUI on line help under Interface settings for a wiring
diagram.
3.
Did you connect the cable in the right direction? This cable is uni-directional and should be
marked with a SOURCE and a PC label. Make sure you connect the SOURCE side of the
cable to the back of the AC source and the PC side of the cable to the PC port.
