Table 41: Query
Field name
Example (hex)
Follower address
01
Function
03 (Read holding registers)
Starting address HI
0B (Register address 3029)
Starting address LO
D5 (Register address 3029)
Number of points HI
00
Number of points LO
02 – (
P 5.5.3.3 Reference Maximum
is 32 bits long, that is, 2 regis-
ters)
Error check (CRC)
–
Response
The register data in the response telegram is packed as 2 bytes per register, with the binary contents right justified within each byte. For
each register, the 1st byte contains the high-order bits, and the 2nd contains the low-order bits.
Example: hex 000088B8 = 35.000 = 35 Hz.
Table 42: Response
Field name
Example (hex)
Follower address
01
Function
03
Byte count
04
Data HI (register 3030)
00
Data LO (register 3030)
00
Data HI (register 3031)
88
Data LO (register 3031)
B8
Error check (CRC)
–
6.1.7.6.3
Force/Write Single Coil (05 hex)
Description
This function forces the coil to either ON or OFF. When broadcast, the function forces the same coil references in all attached followers.
Query
The query telegram specifies the coil 65 (parameter write control) to be forced. Coil addresses start at 0, that is, coil 65 is addressed as 64.
Force data = 00 00 hex (OFF) or FF 00 hex (ON).
92
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