Remote Operation
There are four types of communication interfaces available:USB, Ethernet, GPIB and RS232.You can choose any one of
them to communicate with a PC.
8.1 RS-232 Interface
RS232 interface:use a cable with two COM interface (DB9) to connect power meter and PC. It can be activated by menu
key on the front panel. All SCPI commands are available through RS-232 programming.
• RS-232 data is a 10-bit word with one start bit and one stop bit. The number of start and stop bits is not program-
mable.
• Baudrate Available baudrate:4800 9600 19200 38400 57600 115200
• RS-232 connection The RS-232 serial port can be connected to the serial port of a controller (i.e., personal com-
puter) using a straight through RS-232 cable terminated with DB-9 connectiors. Do not use a null modem cable.
Table [tab:rs232pinout] shows the pinout for the connector.
If your computer uses a DB-25connector for the RS-232interface, you will need a cable or adapter with a DB-25 connector
on one end and a DB-9 connector on the other, wired straight through(not null modem).
Pin Signal
1 NC
2 TX
3 RX
4 NC
5 GND
6 NC
7 CTS
8 RTS
9 NC
Figure 8.1
RS-232 DE-9 Connector
8.1.1 RS-232 troubleshooting
If you are having trouble communicating over the RS-232 interface, check the following: The computer and the power
meter must be configured for the same baudrate, parity, number of data bits,and flow control options. Note that the
eledtronic load is configured for 1 start bit and 1stop bit (these values are fixed). The correct interface cables or adapters
must be used, as described under RS-232 connector. Note that even if the cable has the proper connectors for your
system, the internal wiring may be incorrect. The interface cable must be connected to the correct serial port on your
computer (COM1, COM2, etc.).
