Evolution Controls EVO/ECM-Modbus - EVO;ECM-MODBUS RTU PROTOCOL; Read Registers Command (03); Write Single Register Command (06)

©Evolution
Controls Inc.
10-Sept-2020
EVO/™ECM-Modbus RTU Series 2 Page 21
Application Guide
©2020 All Rights Reserved
Evolution Controls Inc.
San Diego, CA USA
Write Multiple Registers Command (16)
Starting
Register
Number of
Registers
Byte
Register 1
Register 2 - 5
Address
Function
HI
LO
HI
LO
Count
HI
LO
HI
LO
Error Check
0-247
16
00
00
00
05
10
0-255
0-255
00
0-100
CRC-16
• All RTUs respond to an address "0" query. All EVO/ECM-Modbus RTUs process the write, but
none reply.
• The command code is 16.
• The EVO/ECM-Modbus RTU only responds to a query for the first five registers.
• The register number is two bytes long. The high byte is 00 and the low byte is 05, representing
the five dynamic data registers the EVO/ECM-Modbus RTU allows to be read by this command.
• The byte count is fixed at 10.
Reply to Modbus Master
Register Number
Data
Address
Function
HI
LO
HI
LO
Error Check
0-247
16
00
00
00
05
CRC-16
• Descriptions of the reply fields are the same as the descriptions of the query fields above.