Detcon 6400-N1P - Manual (Page 25)

1600/6400-N1P
1600/6400-N1P- Instruction Manual Rev. 1.1 Page 21 of 38
When switching between the Program Menu protected mode and unprotected mode, the user must press the
reset key on the back of the controller module to alert the controller to acknowledge the change in setting.
Figure 29 Non-Protected vs. protected
Figure 30 Dip-switches
7.0 Secondary Modbus™ Port
Model 1600/6400 controllers feature Modbus™ compatible communications protocols and are addressable by
a PLC, PC/HMI, DCS, or other Modbus™ RTU master polling 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 1600/6400
Controller secondary port setup as a slave device. Wiring should be brought directly to the back of the
controller (See section Installation and Figure 5). 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.
To set the 1600/6400 controller Secondary ModBus™ to Slave Mode place dipswitch #4 in the “OFF”
position. To set the Baud Rate for 9,600 baud (strongly recommended) place dipswitch #5 in the “ON”
position. To set the baud rate to 19,200 place the switch in the “OFF” position.