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2020
EVO/
™ECM-Modbus RTU
Series 2
Page 23
Application Guide
©2020 All Rights Reserved
Evolution Controls Inc.
San Diego, CA USA
Write Single Coil Register Command (05)
Register Number
Data
Address Function
HI
LO
HI
LO
Error Check
0-247
05
00
1-34
XX
00
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 05.
•
The register number is two bytes long. The high byte is 00, the low byte is an integer within the
range of valid register, 1 to 34.
•
The data field is two byte long. XX = FF to switch the coil on, XX = 00 to switch the coil off.
Reply to Modbus Master
Register Number
Data
Address Function
HI
LO
HI
LO
Error Check
0-247
05
00
1-34
XX
00
CRC-16
•
The response to a write single coil register query is identical to the query.
