Siemens PGC 302 Edition II - Page 60

Permissible cable length
RS485 TTY
Permissible
cable length
1500 m 9600 Baud:
4800 Baud:
2400 Baud:
400 m
1000 m
2500 m
Recom-
mended cable
shielded,
2 x twisted in pairs
2 x 0,2
¨
LiFYCY
shielded,
2 x twisted in pairs
2 x 2 x 0,5
¨
HINWEIS:
The permissible cable length with TTY depends on the baud
rate. Note that the maximum distance is only half the value
because there is a forward line and a return line!
Pin assignments of
PCPU interfaces SER. 1 to SER. 4
Pin number on 9-pin plug of
PCPU-2 for
Standard Signal SER.1 SER. 2 SER. 3 SER. 4
RS232 GND
TxD
RxD
CTS
DCD
RTS
1
2
3
5
1
2
3
5
1
2
3
5
6
7
1
2
3
5
6
7
TTY TxD-
TxD+
RxD-
RxD+
6
7
8
9
6
7
8
9
RS485 a
b
8
9
8
9
Voltage +5V4444
All connectors on PCPU-2 are 9 pin D-Sub, female
Terminals for interfaces
RS485: SER. 3 and SER. 4
TTY: SER. 1
(PGC 302
edition II
only)
Signal
PGC 302
edition II
Terminal board
SER.1 SER.3 SER.4
RGC 202
edition II
Terminal board
SER.3 SER.4
RS485
a
b
Shield
26
27
28
29
17
16
19
18
TTY
TxD-
TxD+
RxD-
RxD+
Looping
points
20
21
22
23
24
25
Terminals 24 and 25 are used as connection points for
cables which must be looped through.
TxD+ RxD- RxD+ TxD-
PGC 302
edition II
Interface SER.1
21 20
23 22
24 25
TxD+ RxD- RxD+ TxD-
PGC 302
edition II
Interface SER.1
21 20
23 22
24 25
com1:
2 3
GND RxD TxD
Control unit
5
230V
L
PE
N
TxD+
RxD-
RxD+
TxD-
TxD RxD GND
24
25
9
10
Converter
230V
L
PE
N
TxD+ RxD- RxD+ TxD-
RGC 202
edition II
Interface SER.1
7 6
9 8
socket
PCPU-2
ChromLAN with TTY
Active
Passive
Active
Passive
DTE
DCE
TTY RS232
25 pin D-Sub female 25 pin D-Sub male
TxD
RxD
Power switch
9
10
24
25
RxD +
RxD -
TxD +
TxD -
Interface converter RS232 to TTY
ChromLAN networks
3VERDRAH.CHP, Stand Dezember 22, 1999
21