Comtrol Modbus TCP Quick Start User Manual
Page 30
30 - Configuring Read-Only Raw/ASCII Devices
DeviceMaster UP Modbus/TCP Quick Start: 2000477 Rev. G
Configuring Read-Only Raw/ASCII Devices
8.
Configure the Modbus/TCP and/or Serial Modbus Master Settings for your environment using one of the
following methods.
•
Master Receive Transfer mode (recommended) writes data directly into the memory of a Modbus/
TCP slave or serial Modbus slave attached to this gateway. This requires the least amount of PLC
programming, requires the least amount of PLC overhead, and provides minimal latency.
Go to Step
on Page 31 to configure Master Receive Transfer mode.
•
Slave Receive Transfer mode requires the PLC to poll for received data. This method is provided for
PLC programmers who prefer polling for data or those who have PLCs that can only operate in master
mode.
Go to Step
on Page 32 to configure Slave Receive Transfer mode.
You can use the Master Receive Transfer method only if your PLC can operate as a
Modbus/TCP slave, Modbus/RTU serial slave, or Modbus/ASCII serial slave.
You can use the Slave Receive Transfer method only if your PLC can operate as a
Modbus/TCP master, Modbus/RTU serial master, or Modbus/ASCII serial master.