RKI Instruments Beacon 410 - Manual (Page 60)

56 • Using the Beacon 410 in a 4-wire Modbus System Beacon 410 Gas Monitor Operator’s Manual
Figure 16: Multiple Beacon 410s in a Two Branch Configuration
Using the Beacon 410 in a 4-wire Modbus System
Although the Beacon 410 is a 2-wire Modbus RTU device, it can be used with a 4-wire
Modbus controller if the system wiring is modified as follows:
• Connect the controller’s TxD0 and RxD0 wires together and use this connection as
the 2-wire Modbus D0 signal.
• Connect the controller’s TxD1 and RxD1 wires together and use this connection as
the 2-wire Modbus D1 signal.
• Connect these D0 and D1 signals and the common wire from the controller to the 2-
wire Modbus Network of Beacon 410s.
Modbus Menu
The Modbus Menu allows you to configure various parameters relating to the Modbus
setup of the Beacon 410. The Modbus Menu includes a 5-minute timeout feature. If you do
not press a control button for 5 minutes, the Beacon 410 automatically returns to normal
operation.
NOTE: If the Beacon 410 returns to normal operation because of a timeout, it enters a
warm-up period just as it does when it is first turned on.
1. While in normal operation, simultaneously press and hold the ENTER and DOWN/NO
buttons for approximately 5 seconds to enter the Modbus Menu. Release the buttons
when the
You Have Entered the MODBUS Menu message appears on the display.
Modbus
Master
Beacon 410
Termination
Jumper
Installed
Beacon 410
Termination
Jumper
Not Installed
Beacon 410
Termination
Jumper
Not Installed
Beacon 410
Termination
Jumper
Not Installed
Beacon 410
Termination
Jumper
Not Installed
ID = 1
ID = 2 ID = 3 ID = 4
Beacon 410
Termination
Jumper
Installed
ID = 32
ID = 31
Up to 32 Beacon 410s can be connected without a repeater.
RS-485 RS-485