Omron 3G3JX

4-77
4-2 Function Mode
4
Functions
Communication Function
•Communication with external network control devices can be carried out from the communication
connector of the 3G3JX, through the RS-485 complying ModBus-RTU protocol.
Communication Specifications
RS-485 Port Specifications and Connection
Details of each communication connector pin are shown below.
Item Description Note
Transfer speed 4800/9600/19200 bps Select using the Digital Operator.
Synchronous system Asynchronous system ⎯
Transfer code Binary ⎯
Transmission mode LSB first ⎯
Complying interface RS-485 ⎯
Data bit length 8 bits (ModBus-RTU mode) (ASCII mode not available)
Parity No parity/Even/Odd Select using the Digital Operator.
Stop bit length 1 or 2 bits Select using the Digital Operator.
Startup method One-way startup via command from the host side ⎯
Wait time Silent interval +0 to 1000[ms] Set using the Digital Operator.
Connection 1:N (N = Max. 32) Set using the Digital Operator.
Connector RJ45 modular jack ⎯
Error check Overrun/Framing/CRC-16/Horizontal parity ⎯
Pin No.: Symbol Description
1 ⎯ Not used. Do not connect.
2 ⎯ Not used. Do not connect.
3 ⎯ Not used. Do not connect.
4 ⎯ Not used. Do not connect.
5 SP Sent and received data: Positive side
6 SN Sent and received data: Negative side
7 ⎯ Not used. Do not connect.
8 ⎯ Not used. Do not connect.
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