CONTREX CX-1200 - Manual (Page 282)

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FUNCTION (06) DATA READ PLC PROGRAM
Table 49 Host Transmission
Byte #
DESC
Decimal
1 2 3 4 5 6 7 8
STX Length Address Function PLC Type ETX CRC
Hex
2 8 1-99 6 0-1 3 0-65535
02 08 01-63 06 00-01 03 0000-FFFF
PLC Program Type:
00 = Default Program
01 = Current User Program
Message Length = 8 bytes
Table 50 CX-1200 Response
Byte #
DESC
Decimal
1 2 3 4 5-132 133 134 135
STX Length Address Msg Error PLC Program ETX CRC
Hex
2 9-135 1-99 0-255 0-255 3 0-65535
02 09-87 01-63 00-FF 00-FF 03 0000-FFFF
PLC Program Field - (2 to 128 Bytes)
This field will contain the PLC Program Requested, which may be any where from 2 to 128 bytes of data.
The format for this data will be in pairs of Commands & Operands:
PLC Command - 1 byte
PLC Operand
- 1 byte
Refer to Appendices: Appendix K for the PLC Program Commands and Appendices: Appendix L for the PLC
Program Operands.
Message Length = 9 to 135 bytes