Manual

1600A-N1R
1600A-N1R Instruction Manual Rev. 0.1 Page 23 of 38
Figure 32 On-Screen Keyboard
5.5 Secondary Modbus™ Port
Model 1600A controllers feature Modbus™ compatible communications protocols and are addressable by a
PLC, PC/HMI, DCS, or other Modbus™ RTU master device. Communication is accomplished by two wire
half duplex RS-485, 9600 or 19,200 baud, 8 data bits, 1 stop bit, no parity, with the 1600A Controller
secondary port setup as a slave device. Wiring should be brought directly to the back of the controller (See
section 3.0 and). A Modbus™ RTU master device up to 4000 feet away can theoretically poll up to 64
different controllers. This number may not be realistic in harsh environments where noise and/or wiring
conditions would make it impractical to place so many devices on the same pair of wires. If a multi-point
system is being utilized, each controller must be set to a different device address.
Modbus™ Register Detail:
Read Holding Registers is the only code supported by the 1600A controllers. The 1600A contains 21 holding
registers that reflect the status its 16 channels. The register data is shown below.
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
40010 Channel 11 Reading
40011 Channel 12 Reading
40012 Channel 13 Reading
40013 Channel 14 Reading
40014 Channel 15 Reading
40015 Channel 16 Reading
40016 Fault Status Bits
High Byte
Bit 7 1 = Channel 16 Fault 0 = Channel 16 no Fault