Detcon 1600A-N1P - Manual (Page 29)

1600A-N1P
Figure 30 On-Screen Keyboard
5.5 Secondary Modbus™ Port
Model 1600A controllers feature a Modbus™ compatible communications port 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, and no parity. Wiring should be brought directly
to the back of the controller (See section 3.0 and
). A Modbus™ RTU master device up to 4,000 feet
away can poll up to 64 different controllers. Noise and/or wiring conditions may limit the number of devices
that can be connected to the Modbus wires. If a multi-point system is being utilized, each controller must be
set to a different device address.
Figure 5
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
1600A-N1P Instruction Manual Rev. 0.1 Page 25 of 40