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RS-232 connections
The RS-232 serial port can be connected to the serial port of a controller (i.e., personal
computer) using a straight through RS-232 cable terminated with DB-9 connectors. Do not use
a null modem cable. The serial port uses the transmit (TXD), receive (RXD), and signal ground
(GND) lines of the RS-232 standard. It does not use the hardware handshaking lines, CTS and
RTS.
Figure 11-10
shows the pinout for the connector.
If your computer uses a DB-25 connector for the RS-232 interface, 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).
25-pin (DB-25) serial port connector on the computer (PC).
Figure 11-10
RS-232 interface connector
5 4 3 2 1
9 8 7 6
RS232
Rear Panel Connector
Table 11-2
RS-232 connector pinout
Pin Number
1
2
3
4
5
6
7
8
9
* RTS and CTS are not used.
shows the rear panel connector for the RS-232 interface, and
Table 11-3
provides pinout identification for the 9-pin (DB-9) or
Description
No connection
TXD, transmit data
RXD, receive data
No connection
GND, signal ground
No connection
RTS, ready to send*
CTS, clear to send*
No connections
Remote Operation
11-29
Table 11-2
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