User Manual

1640-N4X
1640-N4X Instruction Manual Rev. 0.0 Page 17 of 28
5.0 Modbus™ Communications
The 1640 Controller features a Modbus compatible communications protocol and is addressable by a PLC,
PC/HMI, DCS, or other Modbus RTU master-polling devices. Communication is accomplished by two wire
half duplex RS-485, 9600 baud, 8 data bits, 1 stop bit, no parity, through the controller COM1 connection port
(P3). The Slave ID number is defaulted to 01Hex.
Modbus™ Register Detail:
Code 03 - Read Holding Registers, is the only code supported by the 1640.
Register #
40000 Channel 1 Reading
40001 Channel 2 Reading
40002 Channel 3 Reading
40003 Channel 4 Reading
40004 Channel 5 Reading
40005 Channel 6 Reading
40006 Channel 7 Reading
40007 Channel 8 Reading
40008 Channel 9 Reading
40009 Channel 10 Reading
4000A Channel 11 Reading
4000B Channel 12 Reading
4000C Channel 13 Reading
4000D Channel 14 Reading
4000E Channel 15 Reading
4000F Channel 16 Reading
40010 Channel 17 Reading
40011 Channel 18 Reading
40012 Channel 19 Reading
40013 Channel 20 Reading
40014 Channel 21 Reading
40015 Channel 22 Reading
40016 Channel 23 Reading
40017 Channel 24 Reading
40018 Channel 25 Reading
40019 Channel 26 Reading
4001A Channel 27 Reading
4001B Channel 28 Reading
4001C Channel 29 Reading
4001D Channel 30 Reading
4001E Channel 31 Reading
4001F Channel 32 Reading