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Chapter 4 Serial communication
Manual VIPA System 200V
4-8
HB97E - CPU - RE_21x-2BS03 - Rev. 15/16
RS232 interface
•
Interface compatible to the COM interface of a PC
•
Protocols supported: ASCII, STX/ETX, 3964(R) and RK512
•
Receive buffer of 1024Byte and send buffer with 1024Byte
•
The maximum telegram length is 1024Byte
•
Logical signals as voltage levels
•
Point-to-point links with serial full-duplex transfer in 3-wire technology
with data transfers over distances of up to 15m
•
Data transfer rate up to 57.6kBaud
Via 9pin plug, you may establish a serial point-to-point connection.
9pin
plug
Connection RS232
Pin
Description
1 CD-
2 RxD
3 TxD
4 DTR-
5 GND
6 DSR-
7 RTS-
8 CTS-
9 RI-
The CPU 21x-2BS03 currently supports the following RS232 signals:
TxD Transmit Data
The transmit data is transferred via the TxD line. When the transmit line is
not used the CPU 21x-2BS03 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
RS232 interface
Connection
interface
RxD
TxD
GND
TxD
RxD
3
2
GND
5
RTS
CTS
7
8
shield
CPU Periphery