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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 4-1 shows the rear panel connector for the RS-232 interface, and Ta
-
ble 4-2 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).
See Appendix B for RS-232 error messages.
Table 4-2
RS-232 connector pinout
Pin number Description
1
2
3
4
5
6
7
8
9
no connection
TXD, transmit data
RXD, receive data
no connection
GND, signal ground
no connection
CTS, clear to send
1
RTS, ready to send
1
no connection
1
CTS and RTS signals are not used.
Rear Panel Connector
54321
9876
RS232
Figure 4-1
RS-232 interface
connector
2000-900 (J - Aug 2010) BOOK.fm Page 8 Wednesday, October 12, 2011 12:29 PM
87


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