CONTREX ML-Drive - 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-Drive 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-Drives receive buffer.
Characters 2, 3 - Device #:
These characters are the access address of the ML-Drive. This number identifies
individual ML-Drives on a mutltidrop system. The ML-Drive will accept data only if
this number matches the ML-Drive's address (CP-70), with the exception of a “00”
address. The “00” address is universally accepted by all ML-Drives that are on the
RS485 Serial Communications Interface.
Character 4 - Message Type:
This character should always be “1”.