4-2 Function Mode 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 4 Functions „ RS-485 Port Specifications and Connection Details of each communication connector pin are shown below. 8k8k8k8 1 2 3 4 5 6 7 8 4-77 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 2 ⎯ ⎯ Not used. Do not connect. Not used. Do not connect. 3 ⎯ Not used.
Do not connect. 4 5 6 ⎯ SP SN Not used. Do not connect. Sent and received data: Positive side Sent and received data: Negative side 7 8 ⎯ ⎯ Not used. Do not connect. Not used. Do not connect.