Manual VIPA CPU 21x Chapter 10 Deployment CPU 21xSER-2
HB103E - Rev. 05/45 10-7
RS232C interface
• Interface compatible to the COM interface of a PC
• Protocols supported: ASCII, STX/ETX, 3964(R) and RK512
• receive buffer of 256Byte and send buffer with 256Byte.
• The maximum telegram length is 255Byte
• Logical signals as voltage levels
• Point-to-point links with serial full-duplex transfer in 2-wire technology
with data transfers over distances of up to 15m (only at RS232C)
• Data transfer rate up to 115,2kBaud
Via 9pin jack, you may establish a serial point-to-point connection.
9pin jack Connection RS232C
Pin Description
1 CD-
2 RxD
3 TxD
4 DTR-
5 GND
6 DSR-
7 RTS-
8 CTS-
9 RI-
The CPU 21x-2BS02 currently supports the following RS232C signals:
TxD Transmit Data
The transmit data is transferred via the TxD line. When the transmit line is
not used the CPU 21x-2BS02 holds it at a logical "1".
RxD Receive Data
The receive data arrives via the RxD line. When the receive line is not in
use, it must be held at a logical "1" by the transmitting station.
Properties
Properties of the
RS232C interface
Connection
interface
RxD
TxD
GND
TxD
RxD
3
2
GND
5
RTS
CTS
7
8
shield
CPU Periphery
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