Thermo Fisher Scientific Micro-Tech 9101/9201 Reference Manual, Rev J C-39
Highway/Data Highway Plus Protocol and Command Set,” publication
1770–6.5, dated 16 September 1991.
NOTE. Only a subset of the protocol has been implemented. The
commands used to read or write the registers are as follows. Typed read
(code 68H) and typed write (67H).
Here are some examples showing how the protocol is used.
Example 1: Connect Message
This message must be sent from the Host to Micro-Tech (Slave) before a request of sending
data can be performed.
Host (PLC) Slave (Micro-Tech)
DLE 10H →
SOH 01H
ADDRESS OF SLAVE
DLE 10H
STX 02H
ADDRESS OF SLAVE
ADDRESS OF HOST
COMMAND 0FH
STS 00H
TMS xxH
TMS xxH
FNC 68H
PACKET OFFSET (LOW)
PACKET OFFSET (HIGH)
TOTAL TRANS (LOW)
TOTAL TRANS (HIGH)
ADDRESS OF DATA (FIRST BYTE)
ADDRESS OF DATA (SECOND BYTE)
ADDRESS OF DATA (THIRD BYTE)
ADDRESS OF DATA (FOURTH BYTE)
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