Danfoss VLT MCD 200 Instrukcja instalacji - Strona 9
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MCD Modbus Module Instructions
10. AP ASCII Protocol
The message fragments used to communicate with the Modbus Module as an AP ASCII slave device
are shown below. The message fragments may be assembled into complete messages as described
in the sections that follow.
Message Fragment Type
Send address
Send command
Send request
Receive data
Receive status
ACK (acknowledge)
NAK (negative
acknowledge)
ERR (error)
nn =
lrc =
ccc =
dddd =
ssss =
10.1. Commands
Commands can be sent to the soft starter using the following format:
Send
address
Possible error responses:
=
Command
Start
Stop
Reset
Quick stop
Forced communication trip
N.B.!:
Data must be transmitted in 8-bit ASCII, no parity, one stop bit.
ASCII Character String or
(Hexadecimal Character String)
EOT
(04h
STX
(02h
STX
(02h
STX
(02h
ACK
(06h)
NAK
(15h)
BEL
(07h)
two byte ASCII number representing the soft starter address where each decimal digit is
represented by n.
two byte longitudinal redundancy check in hexadecimal.
three byte ASCII command number where each character is represented by c.
four byte ASCII number representing the current or temperature data where each decimal digit is
represented by d.
four byte ASCII number. The first two bytes are ASCII zero. The last two bytes represent the nibbles
of a single byte of status data in hexadecimal.
ACK
Send
command
Master
=
ASCII
B10
B12
B14
B16
B18
MG.17.F5.02 - VLT® is a registered Danfoss trademark
[nn]
[lrc]
[nn]
[lrc]
[ccc]
[lrc]
[ccc]
[lrc]
[dddd]
[lrc]
[dddd]
[lrc]
[ssss]
[lrc]
[ssss]
[lrc]
or
or
or
ACK
NAK
(Invalid LRC)
Slave
(soft starter)
Comment
Initiates a start
Initiates a stop
Resets a trip state
Initiates an immediate removal of voltage from the motor. Any soft
stop settings are ignored.
Causes a communications trip
AP ASCII Protocol
ENQ or
05h)
ETX or
03h)
ETX or
03h)
ETX or
03h)
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