
Cabling and Wiring the System
6-32
SIMATIC 545/555/575 System Manual
6.4 Connecting Modems
545, 555, and 575 CPUs can communicate through Port 1 (RS-232) to an
operator interface or programming station through a dedicated line or
dial-up phone modems. Dedicated line operation is a line used exclusively to
connect the modems. Dial-up phone operation connects the modems by
telephone lines. Refer to Figure 6-22 for a typical configuration.
RS-232
(9-Pin Port
for
545/555)
(25-Pin Port
for
575)
CPU
Programming
Device
Modem Modem
Connect in accordance
with the modem manual
545/555 CPUs require
25-9 pin female adapter,
INMAC 359–4 (or equivalent)
Cable
(2462553–0001)
Cable
(2462553–0001)
25-9 pin female adapter,
INMAC 359–4 (if needed)
EIA RS-232C
connectors
EIA RS-232C
connector
Figure 6-22 Modem Configuration
NOTE: The modems must provide an EIA RS-232C DTE interface to the
controller and operator interface and must have a built-in error correction
capability. Although the controller supports both full- and half-duplex
communications, TISOFT only supports full-duplex communications.
Overview
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