VIPA CPU 21 Series - Deployment of the serial interface

Manual VIPA CPU 21x Chapter 9 Deployment CPU 21xSER-1
HB103E - Rev. 05/45 9-7
Deployment of the serial interface
The PLC has got a RS232C- (Order-No.: 21x-2BS12) or RS485-interface
(Order-No.:21x-2BS32).
Both interfaces are described in the following.
• Interface is compatible to the COM interface of a PC
• Logical signals as voltage levels
• Point-to-point links with serial full-duplex transfer up to 15m of distance
• Data transfer rate up to 115.2kBaud
• Protocols supported: ASCII, STX/ETX, 3964R, USS and Modbus
• receive buffer an send buffer each with 2x256Byte
• The maximum telegram length is 255Byte
9pin plug Connection RS232C
• Logical states represented by voltage differences between the two cores
of a twisted pair cable
• Serial bus connection in two-wire technology using half duplex mode
• Data communications up to a max. distance of 500m
• Data communication rate up to 115.2kBaud
9pin jack Connection RS485
Outline
RS232 interface
Connection
RS232C
RS485 interface
Connection
RS485
RxD
TxD
GND
TxD
RxD
3
2
GND
5
RTS
CTS
7
8
shield
CPU 21x - RS232C Periphery
Pin RS232C
1 CD-
2 RxD
3 TxD
4 DTR-
5 GND
6 DSR-
7 RTS-
8 CTS-
9 RI-
Pin RS485
1 n.c.
2 n.c.
3 RxD/TxD-P (Line B)
4 RTS
5 M5V
6 P5V
7 n.c.
8 RxD/TxD-N (Line A)
9 n.c.
RxD/TxD-P (B)
RxD/TxD-N (A)
shield
CPU 21x - RS485
Periphery
3
8
Periphery
Periphery
RxD/TxD-P (B)
RxD/TxD-N (A)
RxD/TxD-P (B)
RxD/TxD-N (A)
RxD/TxD-P (B)
RxD/TxD-N (A)
1
2
3
4
5
6
7
8
9
5
4
3
2
1
9
8
7
6