RP Series
March 2011
35
Note: The PGUI32 can be run in the absence of a power source. If no AC source is
available , the PGUI32 can be operated in a simulation mode. The program will
detect these conditions and start up in simulation mode after notifying the
operator. Measurements in this case will be simulated and should not be used
for any analytical purpose.
8.4.
RS232C Cable Wiring
California Instruments AC power sources require a special RS232C cable to communicate
with a PC. Standard null-modem cables obtained from a computer hardware store most likely
will not work. For this reason, all California Instruments power sources that operate over
RS232C are supplied with a RS232C 9 pin female to 9 pin female cable.
If for some reason this cable cannot be located, the following cable diagram shown in Figure
8-1 should be used when constructing a serial cable.
Figure 8-1: RS232C Cable Wiring
DB-9 PC
DB-9 AC Source
Pin
1
2
3
4
5
6
7
8
9
Pin
1
2
3
4
5
6
7
8
9
Direction
output
input
output
output
-
input
-
-
output
Description
reserved
Receive data(RxD)
Transmit data (TxD)
Data Terminal Ready (DTR)
Signal Ground
Data Set Ready (DSR)
no connect
no connect
reserved
Note: This cable is not bi-directional so it is important to mark the PC side and the
AC source side of this cable. If the cable is connected in reverse, it will not
operate correctly.
