Mx350_01a_oi_e.docx / Nov-19
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Appendix
Data readout via serial interface
All codes shown in the parameter SERIAL VALUE are available for serial readout by PC or PLC. The
communication of Motrona devices is based on the Drivecom protocol according to ISO 1745 or the
Modbus RTU protocol. All protocol details can be found in our manual SERPRO (Drivecom) which is
available for download from our homepage www.motrona.com and in the capter “Modbus RTU Interface”
in this manual.
To request for a data transmission you must send the following request string to the converter:
EOT
AD1
AD2
C1
C2
ENQ
EOT = control character (Hex 04)
AD1 = unit address, High Byte
AD2 = unit address, Low Byte
C1 = register code, High Byte
C2 = register code, Low Byte
ENQ = control character (Hex 05)
The following example shows the request string for readout of the actual input frequency of a monitor
(Code=1) from a unit with unit address 11:
ASCII-Code: EOT
1
1
:
1
ENQ
Hex-Code:
04
31
31
3A
31
05
Binary-Code: 0000 0100 0011 0001 0011 0001 0011 1010 0011 0001 0000 0101
After a correct request, the unit will respond:
STX
C1
C2
xxxxx
ETX
BCC
STX = control character (Hex 02)
C1 = register code, High Byte
C2 = register code, Low Byte
xxxxx = readout data
ETX = control character (Hex 03)
BCC = block check character
