MODBUS RTU Instruction Manual - 2017-11-02.docx Page 14 of 14 November 2, 2017
3.0 Product Specifications
Communications Protocol: Modbus RTU
Communications Format: RS-485, Half-Duplex
Connection Type: Plug-In Terminal Block with Wire Entries
Input: Ch. A (+), Ch. B (-), Shield
Output: Ch. A (+), Ch. B (-), Shield
Recommended RS-485 Cable: Belden 9841 (PVC Jacket), 89841 (FEP Teflon Jacket) or similar
Maximum Cable Length: 4000 Feet/1200 Meters total to end of run
LED Indicators: TX (Slave Transmit), RX (Global Receive)
Serial Data Format: Fixed, 1 Start Bit, N-8-1
Baud Rate: 9600, 19200, or 38400, Dip Switch Selectable
Slave Address Select: 1 thru 64, Dip Switch Selectable
Maximum Slave Response Time: 400ms
Maximum Number of 16-Bit Registers per READ Command: 64
Maximum Register Update Rate from TMS: 1.2 seconds (0.8 seconds typ.)
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