E-2 RS485/MODBUS Protocol
MN767S
E.5 Hardware Specifications
Table E-3 Communication Hardware
Installation
Use RJ11 connector on control (see chapter 5)
Power Supply
Provided by isolated power from the inverter power supply
E.6 Communication Specifications
Table E-4 Communication Specifications
Communication Speed
115200 bps (default), 57600, 38400, 19200, 9600
Error Check
CRC
Data Format
1 start bit, 8 data bits, 1 stop bits, no parity
Physical Signal
RS 485 (2 wire)
User Interface
RJ11
Protocol
Modbus RTU
E.7 Communications Protocol (MODBUS-RTU)
The VS1STS supports Master / Follower Modbus RTU communications, using the 03 Read Holding Registers and 06 Write
Single Holding Register commands. Many Master devices treat the first Register address as Register 0, therefore it may be
necessary to convert the Register Numbers detail in section 0 by subtracting 1 to obtain the correct Register address. The
telegram structure is as follows:
Table E-5 Command 03 – Read Holding Registers
Master Telegram
Length
Follower Response
Length
Follower Address
1 Byte
Follower Address
1 Byte
Function Code (03)
1 Byte
Starting Address
1 Byte
1st Register Address
2 Byte
1st Register Value
2 Bytes
No. Of Registers
2 Byte
2nd Register Value
2 Bytes
CRC Checksum
2 Byte
Etc.
2 Bytes
CRC Checksum
2 Bytes
Table E-6 Command 06 – Write Single Holding Register
Master Telegram
Length
Follower Response
Length
Follower Address
1 Byte
Follower Address
1 Byte
Function Code (06)
1 Byte
Function Code (06)
1 Byte
Register Address
2 Byte
Register Address
2 Bytes
Value
2 Byte
Register Value
2 Bytes
CRC Checksum
2 Byte
CRC Checksum
2 Bytes
Summary of Contents for VS1STS Series
Page 1: ...10 11 Installation Operating Manual MN767S VS1STS AC Microdrive ...
Page 6: ...iv MN767S ...
Page 28: ...5 8 Control Wiring MN767S ...
Page 50: ...8 2 Customizing Your Application MN767S ...
Page 54: ...9 4 Troubleshooting MN767S ...
Page 56: ...A 2 Technical Specifications MN767S ...
Page 68: ...D 2 Options and Kits MN767S ...