Serial modbus master and modbus/tcp settings – Comtrol Modbus TCP User Guide User Manual
Page 47
DeviceMaster UP Modbus/TCP User Guide: 2000447 Rev. I
Chapter 3. Embedded Configuration Pages- 47
Common Configuration Areas (Serial or Ethernet Device)
3.6. Common Configuration Areas (Serial or Ethernet Device)
The Edit Serial Port Configuration and Edit Socket Port Configuration pages have the following areas in
common. This section discusses the following:
•
3.6.1. Serial Modbus Master and Modbus/TCP Settings
•
3.6.3. Filtering/Data Extraction Configuration
•
3.6.4. Application TCP Connection Configuration
3.6.1. Serial Modbus Master and Modbus/TCP Settings
Use this area to set up the Modbus/TCP raw-data settings for a serial or socket port.
Note: (Raw-Data Only) displays on the serial version of the Serial Modbus Master and Modbus/TCP Settings
area.
Serial Modbus Master and Modbus/TCP Settings
Rx (To PLC) Transfer
Mode
Specifies the Modbus/TCP raw-data receive data transfer mode to the PLC.
There are three possible settings.
•
Slave (PLC Polls) – The PLC will poll the DeviceMaster UP for received data
by sending read requests on a continual basis.
•
Master (Write to PLC) – The DeviceMaster UP will write received data into
the specified PLC address using write messages.
•
Off – Received data will not be sent to the PLC.
The default is Slave Mode.
Note: Slave (PLC Polls) must be selected to interface to serial Modbus masters.
Tx (From PLC) Transfer
Mode
Specifies the Modbus/TCP raw-data transmit data transfer mode to the PLC.
There are three possible settings.
•
Slave (PLC Writes) – The PLC sends write messages to transmit data. A
message received with an incremented sequence number indicates new
data to send, unless the Disable Tx Sequence Number Check option is
selected.
•
Master (Poll the PLC) – The DeviceMaster UP sends read messages to poll
the PLC at the specified address, rate, and message length. A message
received with an incremented sequence number indicates new data to send,
unless the Disable Tx Sequence Number Check option is selected.
•
Off – Transmit data will not be accepted from the PLC.
The default is Slave Mode.
Note: Slave (PLC Writes) must be selected to interface to serial Modbus
masters.