Serial (Com) Modbus - Microhard Systems BulletPlus Operating Manual

4.0 Configuration
4.11.1.2 Modbus > COM (Serial) Modbus
The BulletPlus can also participate in serial based Modbus, to configure and view the serial Modbus
settings, the COM1 port must first be disabled in the Comport > Settings menu. Only the settings that are
different from TCP Modbus will be discussed.
Disable to select the Serial (COM) mode for the Modbus service. In RTU
mode, communication is in binary format and in ASCII mode,
communication is in ASCII format.
The serial baud rate is the rate at which the modem is to
communicate with the attached local serial device.
This setting determines the format of the data on the serial port.
The default is 8 data bits, No parity, and 1 Stop bit.
© Microhard Systems Inc.
Image 4-11-2: Apps > Modbus Serial Configuration
COM Mode Status
Values (selection)
Disable
Enable COM ASCII Mode
Enable COM RTU Mode
Baud Rate
Values (selection (bps))
921600 57600 14400
460800 38400 9600
230400 28800 7200
115200 19200 4800
Data Format
Values (selection)
8N1 / 8E1 / 8O1
3600
2400
1200
600
135