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Configuring the Modbus Models
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3.4.3 Slave Device Address
If the port is to be configured as a Modbus single slave device port, a
slave device address must be assigned to the port in the range 1 ... 247
decimal.
The address is part of the configuration of a port to which a single slave
device is attached. This address is not applicable to Modbus master
devices, as they do not use a device address. It is also not applicable to
Modbus networked devices, as multiple devices can exist on the port.
3.4.4 Communication Parameters
You must set each port's parameters to communicate with the Modbus
device or devices attached to the port. Refer to the documents for your
devices to determine their parameters. Modicon Modbus devices
generally support the following parameters:
V RTU (8-bit binary) mode, 9600 baud, 8 data bits, 1 or 2 stop bits,
even/odd/no parity
V ASCII (character) mode, 9600 baud, 7 or 8 data bits, 1 or 2 stop
bits, even/odd/no parity.
Models NW-BM85C002 and NW-BM85D008 do not have a Stop Bits
setting. These models default to 8 data bits with 1 Stop Bit.
3.4.5 Port Priority
The Purpose of the Parameter
The BM85 services the four Modbus ports in a sequence that you can
establish during configuration by setting the Port Priority parameter.
Setting the Parameter
You set the sequence by assigning a priority to each port in the range
1 ... 4, with 1 being the highest priority. The port that is assigned
priority 1 will be the first port that is serviced on power up.