© Microhard Systems Inc.
135
4.0 Configuration
4.10.5.2 Modbus > COM (Serial) Modbus
The IPn4G 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.
COM Mode Status
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.
Values (selection)
Disable
Enable COM ASCII Mode
Enable COM RTU Mode
Data Mode
Determines which (rear of unit) serial interface shall be used to connect to
external devices: RS232, RS485, or RS422. This option applies only to
COM1. When an interface other than RS232 is selected, the DE9 port will
be inactive.
Values (selection)
RS232
RS485
RS422
Baud Rate
The serial baud rate is the rate at which the modem is to
communicate with the attached local serial device.
Values (selection (bps))
921600
460800
230400
115200
14400
9600
7200
4800
57600
38400
28800
19200
3600
2400
1200
600
300
Data Format
This setting determines the format of the data on the serial port.
The default is 8 data bits, No parity, and 1 Stop bit.
Values (selection)
8N1
8N2
8E1
7E1
7O1
7E2
7O2
8O1
7N1
7N2
Image 4-10-7: Tools > Modbus Serial Configuration