Control command send, Character 1 - stx, Characters 2, 3 - device – CONTREX MLP-Drive User Manual
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Control Command Send
The Control Command Send allows the host computer to control the operating
functions of the MLP-Drive 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-Drives receive buffer.
Characters 2, 3 - Device #:
These characters are the access address of the MLP-Drive. This number identifies
individual MLP-Drives on a mutltidrop system. The MLP-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 MLP-Drives that are on
the RS485 Serial Communications Interface.
Character 4 - Message Type:
This character should always be “1”.