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6
Commissioning
6.1
Contact assignment
6.1.1
Contact assignment RS 232
V1
If you have assembled the cables yourself, please note the following:
Statutory EMC requirements also apply to the cable connec-
tions. Use only shielded connection lines with shielded plugs/
sockets.
Reliably isolate all equipment connected to the extra-low
voltage inputs and outputs according to DIN EN 61140
to safeguard against dangerous contact voltages. For
example, use double or reinforced insulation according to
DIN EN 60730-1 or DIN 60950-1.
Note the contact assignment required in each case,
see Ä Chapter 6.1.1 "Contact assignment RS 232"
on page 15and Ä Chapter 6.1.2 "Contact assignment
RS 485" on page 17.
The RS 232/485 interface is designed as a 9-pin D-Sub socket. The con-
nector can be configured for a 9‑ or 25‑pin connection to a PC or control
station according to the contact assignments listed below. The plugs must
always be secured with the integral screw connection.
Refer to Ä Chapter 12 "Accessories" on page 40 for accessory information
on assembling connection cables.
Systems connected to RS 232 connections use so-called "handshake sig-
nals" to transmit status information, which enable the receiving system to
stop transmitting data that it can no longer process. The handshake therefore
helps protect against data loss.
Status information can be transmitted in two different ways:
Software
- The status information is part of the actual data transfer. A
handshake
three-wire cable is adequate, while signaling is performed via
an additional coding.
Hardware
- Status information is transmitted at the same time as the
handshake
data. Status information is not included in the operating
data, but the signaling requires a 7-wire cable for additional
signal lines.
Interface module LRZ 926
15 / 43
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