CONTREX ML-TRIM - Manual (Page 92)

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Control Command Send
The Control Command Send allows the host computer to control the operating
functions of the ML–Trim that are associated with the digital inputs (Run, Stop,
Setpoint Select and Master/Follower).
Table 3-31 Control Command Send - Host Transmission
Character # 1 2 3 4 5 6 7 8 9 10 11 12
DEV # DEV # MSG PAR # PAR # DATA DATA DATA DATA DATA
DESC STX 10s 1s TYPE 10s 1s 1000s 100s 10s 1s FORM ETX
ASCII STX 0-9 0-9 1 0 0 0 0 0-1 0-9 0 ETX
The following is a description of the Control Command Send - Host Transmission.
Character 1 - STX:
This is the first character in the character string. None of the other characters will
be recognized without this character prefix. Always use the ASCII “STX” character;
it enables the ML–Trims receive buffer.
Characters 2, 3 - Device #:
These characters are the access address of the ML–Trim. This number identifies
individual ML–Trims on a mutltidrop system. The ML–Trim will accept data only if
this number matches the ML–Trim's address (CP-70), with the exception of a “00”
address. The “00” address is universally accepted by all ML–Trims that are on the
RS485 Serial Communications Interface.
Character 4 - Message Type:
This character should always be “1”.