BQ351 Modbus IO Device User Manual
Register - Coil Table
Global Modbus specifitions says first address is 1 but sometimes some PLC or scada applications accept
0 as first modbus register address. Our documents are prepared for based 1. If your plc accept 0 based
register addresses; you can decrease -1 from the addresses below.
Device Settings with “Modbus Device Manager”
Device default baudrate is 9600 baud. (8 Bit, No parity, 1 Stop)
You can adjust device address from DIP switch and you can start
using device with 9600 baud easly.
But sometimes you can need other baudrates or you can need
addresses greater then 14. In this situation you can change
device settings with RS485.
For this you must put device to “Settings Mode”. After than you
can change device settings with our “Modbus Device Manager”
application. Also experts users can use Modbus RTU protocol for
changing settins instead of Modbus Device Manager. Expert
users can reach detailed information about our web page or can
contact with us.
Settings Mode
For making settings from “Modbus Device Manager”; you must put device settins mode. Power off
device and put all DIP switchs to “OFF” position. Now you can give power to device. You will see power
and busy led is ON together; this shows device is in “Settings Mode”
Now connect RS485 to computer and use “Modbus Device Manager” application for reading or changing
device settings.
After making changes you must exit from “Settings Mode” For this set all DIP switchs ON position and
reset the power of device.
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