Chapter 7 Appendix
203
7.3 Extension SIO
It can be applicable to SEL program communication and IAI protocol communication features if
serial communication type (model code SE1: RS232C, SE2: RS485) is mounted to the
extension I/O.
7.3.1 Specification
Item Contents
Interface standards RS-232C Interface standards
Communication system Start-Stop Synchronous
Full / Half Duplex
Communication
Communication system
Connector D-sub9 pin
Baud rate (bps) 9.6k,19.2k,38.4k,57.6k,76.8k,115.2k,230.4k
Data length 7 or 8 bit
Start bit 1 bit
Stop bit 1 or 2 bit
Binary classification None, Odd or even
Connector on Controller Side D-sub, 9-pin (Male)
7.3.2 Functions
(1) SEL Program Communication
It is the communication mode to send and receive data by writing and reading the data of each
SIO channel using the communication SEL commands (OPEN, READ, WRIT, CLOS, TMRW
and SCHA). (Refer to SEL Language Programing Manual for more details. )
The number of maximum available channels is one channels, user release channels 2.
(2) IAI Protocol Communication
It is the communication mode for the host system to refer to the data inside the controller or to
indicate the command execution by using the serial communication protocol dedicated for IAI.
IAI protocol communication makes only one channel, User Release Channel 2, valid. (Valid in
priority in MANU Mode, valid in I/O parameter setting channel in AUTO Mode)
Be careful to the connection as it may get disconnected when execution commands are
received at the same time from multiple connections in MANU mode.
7.3.3 Wiring
Prepare a D-sub 9-pin connector and solder wires to each signal.
Pin
No.
RS232C
Signal
name
RS485
Signal
name
Contents
1 NC NC Not connected
2 RXD NC Received Data (RS232C)
3 TXD SGA
Sent Data (RS232C) /
Communication line A (RS485)
4 NC NC Not connected
5 GND GND Signal Ground (Insulation)
6 NC NC Not connected
7 NC SGB Communication line B (RS485)
8 NC NC Not connected
9 NC NC Not connected
5
1
9
6
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