Comtrol Modbus TCP User Guide - Manual (Page 46)

46 - Chapter 3. Embedded Configuration Pages DeviceMaster UP Modbus/TCP User Guide: 2000447 Rev. I
Socket Packet ID Settings
ETX Tx Append
When enabled, the DeviceMaster UP appends an ETX (end of transmission) byte sequence
which is configured as one byte or two bytes to the end of the Ethernet packet before it is
sent. The length indicates the number of ETX bytes, valid values for length are:
• none - Disables this function.
• one byte - Inserts one ETX byte at the end of the data.
• two bytes - Inserts two ETX bytes at the end of the data.
Byte 1 - Specifies the transmit character associated with the first ETX byte, if the length is
set to one byte or two bytes. You can specify a value between 0 and 255 in decimal format.
Byte 2 - Specifies the transmit character associated with the second ETX byte, if the length
is two bytes. You can specify a value between 0 and 255 in decimal format.
Strip Rx STX/
ETX
When you select this check box, the DeviceMaster UP strips STX/ETX characters from
received Ethernet packets. Clear the check box when you do not want the DeviceMaster
UP to strip STX/ETX characters from received Ethernet packets.
Packets sent from the PLC to the DeviceMaster UP (over Ethernet), and then sent out the
Ethernet port, are not checked for STX/ETX. No STX/ETX character stripping occurs in
these Ethernet packets.
Socket Packet ID Settings (Continued)