20.1 PLC Connection 20-5
EH-SIO
PORT1/PORT2
The following table shows the signal level and the communication protocol for each port. Other parameters (7 bits, 1 bit,
even) are fixed.
DIP switch 1/2
Set the baud rate for PORT1/2 using the DIPSW1/2 attached to the side of EH-SIO. For more information, refer to the PLC
manual issued by the manufacturer.
Ladder program
Make initial settings for the transmission control protocol and the station number.
For more information, refer to the PLC manual issued by the manufacturer.
MICRO EH
The following table shows the signal level and the communication protocol for each port. Other parameters (7 bits, 1 bit,
even) are fixed.
Port Signal Level Communication Protocol EH-SIO Version
PORT1 RS-232C
Transmission control protocol 1 Version 2.0 and later
Transmission control protocol 2 Version 2.1 and later
PORT2
RS-232C
Transmission control protocol 1 Version 2.0 and later
Transmission control protocol 2 Version 2.1 and later
RS-422
Transmission control protocol 1 Version 2.0 and later
Transmission control protocol 2 Version 2.1 and later
Transmission control protocol 1 with port Version 2.0 and later
Transmission control protocol 2 with port Version 2.1 and later
RS-485
Transmission control protocol 2 Version 2.1 and later
Transmission control protocol 1 with port Version 2.0 and later
Transmission control protocol 2 with port Version 2.1 and later
CPU Model Port Signal Level Communication Protocol
EH-D10
EH-D14 / EH-A14
EH-D20 / EH-A20
EH-D23 / EH-A23
EH-D28 / EH-A28
EH-D40 / EH-A40
EH-D64 / EH-A64
PORT1 RS-232C
Transmission control protocol 1
Transmission control protocol 2
EH-D23 / EH-A23
EH-D28 / EH-A28
PORT2 RS-422
Transmission control protocol 1
Transmission control protocol 2
Transmission control protocol 1 with port
Transmission control protocol 2 with port
EH-x64xxx + EH-OB232
PORT2
RS-232C
Transmission control protocol 1
Transmission control protocol 2
EH-x64xxx + EH-OB485 RS-422
Transmission control protocol 1
Transmission control protocol 2
Transmission control protocol 1 with port
Transmission control protocol 2 with port
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