Comtrol UP DeviceMaster User Guide - Manual (Page 74)

74 - Chapter 3. Embedded Configuration Pages DeviceMaster UP Modbus/TCP User Guide: 2000447 Rev. I
Socket Packet ID Settings
ETX (End of
Transmission)
Rx Detect
When enabled, the DeviceMaster UP detects an ETX (end of transmission) byte sequence
that is configured as one byte or two bytes marking the end of the Ethernet packet. The
length indicates the number of ETX bytes, valid values for length are:
• none - Disables this function and the DeviceMaster UP uses the Rx Timeout Between
Packets to indicate the end of data packet.
• one byte - Scans Ethernet data for one ETX byte and when the DeviceMaster UP finds
the ETX byte, it identifies the data as an Ethernet packet.
• two bytes - Scans Ethernet data for two ETX bytes and when the DeviceMaster UP
finds the ETX bytes, it identifies the data as an Ethernet packet.
Byte 1 - Specifies the character to scan for in the first ETX byte, if the length is one byte
or two bytes. You can specify a value between 0 and 255 in decimal format.
Byte 2 - Specifies the character to scan for in the second ETX byte, if the length is two
bytes. You can specify a value between 0 and 255 in decimal format.
PLC Specific Settings and Application Specific Settings
STX Tx Append
When enabled, the DeviceMaster UP appends an STX (start of transmission) byte
sequence which is configured as one byte or two bytes to the beginning of the Ethernet
packet before it is sent. The length indicates the number of STX bytes, values for length
are:
• none - Disables this function.
• one byte - Inserts one STX byte before the data.
• two bytes - Inserts two STX bytes before the data.
Byte 1 - Specifies the transmit character associated with the first STX byte, if the length is
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 STX byte, if the length
is two bytes. You can specify a value between 0 and 255 in decimal format.
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)