Specifications

MCD3000 Series
12 MG.15.A4.22 - VLT is a registered Danfoss trademark
Installation
Example 4. MCD3000 controlled by remote 3 wire
push button circuit.
Notes:
1. The MCD3000 must be in remote mode to
function with this circuit. Use the
[LOCAL/REMOTE] push button to switch between
local and remote modes.
■
Serial communications
The MCD3000 has a non-isolated RS485 serial
communications link. The serial link can be used to;
• Control MCD3000 operation
• Query MCD3000 status and operating data
• Read (download) MCD3000 parameter settings
• Program (upload) MCD3000 parameters
ATTENTION
Communications cabling should not be
located within 300mm of power cabling.
Where this cannot be avoided consideration should be
given to providing magnetic shielding to reduce
induced common mode voltages.
Data transmitted to and from the MCD3000 must be
in 8 bit ASCII, no parity, 1 stop bit.
The MCD3000 can be programmed to trip if the
RS485 link fails. This is done by setting Par. 24 Serial
Communications - RS485 Time Out.
Baud rate is set by Par. 22 Serial Communication -
Baud Rate.
The starter address is assigned using Par. 23 Serial
Communications - Satellite Address.
ATTENTION
Slave address must be two digit, addresses
less than 10 must have a leading zero (0).
ATTENTION
If no MCD3000 starter is configured to the
specific slave address, no response will be
received by the host.
ATTENTION
The MCD3000 may take up to 250ms to
respond. The host software timeout should be
set accordingly.
ATTENTION
The satellite address and baud rate may also
be altered through the serial interface.
Behaviour of the serial interface will not be affected by
such parameter changes until the current Serial
Programming mode session is terminated by the
master. The serial master application must ensure that
altering these parameters does not cause
communication problems.
The details of the message fragments used in
communicating with the MCD3000 are shown in the
table below. The message fragments may be
assembled into complete messages as described in
the sections that follow.
Message
Fragment Type
ASCII Character String or
(Hexidecimal Character
String)
Send Address EOT [nn] [lrc] ENQ or
(04h [nn] [lrc] 05h)
Send Command
Send Request
Read Parameters
STX [ccc] [lrc] ETX or
(02h [ccc] [lrc] 03h)