Digi TransPort WR11 User Manual page 658

Configuring legacy protocols
Enable MODBUS Gateway
Enables or disables MODBUS gateway instance.
Async Port
The local serial port number (asynchronous port) for the MODBUS serial interface.
Async Mode
The serial driver for RS232 or RS485 on supported hardware.
Duplex Mode
The duplex mode, which can be half or full. Use full for 4-wire installations; otherwise half is
required.
Operation Mode
The operation mode to master or slave.
Idle Gap
When receiving an modbus response from a station when this idle gap (pause with no reception
of characters) is detected the message (currently received from the station) is at that staged
forwarded on as the complete response.
Fix slave address
The address of the slave is fixed at this value. An address conversion will occur if a message
that does not contain this address is received from the TCP master. If you do not use this
setting, the TCP master must use the correct slave address.
Adjust slave address
The address of the slave is adjusted by this value. If left at 0, the slave address is not adjusted
at all.
Response time
This parameter is used in master mode. It specifies the amount of time, in milliseconds, that
the router waits for a for a response after polling a station. Default is 700 milliseconds. This
timer stops as soon the router receives the first few serial characters from the slave, since a
response is coming and is either end good or a bad CRC.
IP Port
The UDP or TCP port on which to listen for protocol messages.
IP Mode
Select the IP mode using this drop down list. The default mode is TCP.
3. Click Apply.
Digi TransPort® Routers User Guide
Configure a MODBUS gateway
658