CONTREX MLP-Trim - Manual (Page 122)

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Control Command Send
The Control Command Send allows the host computer to control the operating
functions of the MLP–Trim that are associated with the digital inputs (Run, Stop,
Setpoint Select and Master/Follower).
Table 3-53 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 MLP–Trims receive buffer.
Characters 2, 3 - Device #:
These characters are the access address of the MLP–Trim. This number identifies
individual MLP–Trims on a mutltidrop system. The MLP–Trim will accept data only
if this number matches the MLP–Trim's address (CP-70), with the exception of a
“00” address. The “00” address is universally accepted by all MLP–Trims that are
on the RS485 Serial Communications Interface.
Character 4 - Message Type:
This character should always be “1”.