HP4402.book : chapter2.fm 54 Thu Feb 11 15:53:59 1999
Power Meter Operation
Configuring the Remote Interface
2-54 HP E4418B User’s Guide
RS232/RS422
With RS232 selected as the serial interface the power meter
communicates through the serial port with single ended drivers and
receivers. With RS422 selsected, the serial port uses balanced drivers and
receivers.
The power meter acts as a DTE device.
To select RS232 or RS422 as the remote interface press ,
, , or .
RS232/422 Connector
The serial port connector is a 9 pin male D-type wired as shown in
Figure 2-18.
Figure 2-18: RS232/422 Pin Assignment
System
Inputs
Remote Interface Select Interface RS232 RS422
Pin RS232 RS422
1 DCD CTS-
2 Rx Rx-
3 Tx Tx+
4 DTR Tx-
5 GND GND
6 DSR Rx+
7 RTS RTS+
8 CTS CTS+
9 RI RTS-
12
34
5
6
7
8
9
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