Central Processing Unit
5–21
1070 072 145-102 (01.07) GB
Pin assignment, female DB-25 connector (active):
Pin Signal designation Signal function
Housing Screen Screening
10 12 V out 12 V out
9 12 V in 12 V in
21 12 V GND 12 V reference conductor
12 RXD+ Receive data +
24 RXD– Receive data –
13 TXD+ Transmit data +
25 TXD– Transmit data –
Connecting cable
. Do not route data lines parallel to power lines.
A premanufactured connecting cable is available to connect to the X31 inter-
face connector:
Designation Order no.
K16 Connecting cable, 5 m 1070 054 956
The maximum permissible length, even of premanufactured cables, de-
pends on the type of cable used. The cable shall be a screened, twisted-con-
ductor 14 x 0.14 mm
2
cable. The following values may not be exceeded:
D Line resistance 0,135 W/m
D Line capacitance 120 pF/m
Interface Baud rate [Baud] max. Cable length [m]
V.24 up to 57600 15
20 mA
9600 300
19200 150
38400 100
57600 50
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