Comtrol UP DeviceMaster User Guide - Manual (Page 73)

DeviceMaster UP Modbus/TCP User Guide: 2000447 Rev. I Chapter 3. Embedded Configuration Pages- 73
Socket Packet ID Settings
3.5.2. Socket Packet ID Settings
This subsection discusses the Socket Packet ID Settings area of the Ethernet Device Configuration page.
Socket Packet ID Settings
Rx Timeout
Between
Packets
Specifies the following information, once the start of a packet is received:
• How long the DeviceMaster UP should wait (in milliseconds) before timing-out, if the
ETX Rx Detect length is one byte or two bytes and the ETX byte(s) are not received.
• The time to wait in milliseconds between Ethernet packets if the ETX Rx Detect
length is set to none.
STX (Start of
Transmission)
Rx Detect
When enabled, the DeviceMaster UP detects an STX (start of transmission) byte sequence
which is configured as one byte or two bytes when it receives an Ethernet packet. The
length indicates the number of STX bytes, valid values for length are:
• none - Disables this function and the DeviceMaster UP accepts the first byte received
after the last ETX byte(s) as the start of the next Ethernet packet.
• one byte - Scans Ethernet data for one STX byte and when the DeviceMaster UP finds
an STX byte it collects the data. If the first byte is not the STX byte, it discards the
byte. The DeviceMaster UP continues to discard the bytes until it finds an STX byte.
• two bytes - Scans Ethernet data for two STX bytes and when the DeviceMaster UP
finds two STX bytes it collects the data. If the STX bytes cannot be found, it discards
the bytes. The DeviceMaster UP continues to discard the bytes until it finds the two
STX bytes.
Byte 1 - Specifies the character that represents the first STX byte. The DeviceMaster UP
looks for this character in 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 character that represents the second STX byte. The DeviceMaster UP
looks for this character in the second STX byte, only if the length is two bytes. You can
specify a value between 0 and 255 in decimal format.