Field Name
Example (HEX)
Slave Address
01
Function
03 (read holding registers)
Starting Address HI
0B (Register address 3029)
Starting Address LO
05 (Register address 3029)
No. of Points HI
00
No. of Points LO
02 - (Par. 3-03 is 32 bits long, i.e.,
2 registers)
Error Check (CRC)
-
Table 7.27
Response
The register data in the response message are packed as
two bytes per register, with the binary contents right-
justified within each byte. For each register, the first byte
contains the high order bits and the second contains the
low order bits.
Example: Hex 0016E360 = 1.500.000 = 1500 RPM.
Field Name
Example (HEX)
Slave Address
01
Function
03
Byte Count
04
Data HI
(Register 3030)
00
Data LO
(Register 3030)
16
Data HI
(Register 3031)
E3
Data LO
(Register 3031)
60
Error Check
(CRC)
-
Table 7.28
7.10.5 Preset Single Register (06 HEX)
Description
This function presets a value into a single holding register.
Query
The query message specifies the register reference to be
preset. Register addresses start at zero, i.e., register 1 is
addressed as 0.
Example: Write to
1-00 Configuration Mode
, register 1000.
Field Name
Example (HEX)
Slave Address
01
Function
06
Register Address HI
03 (Register address 999)
Register Address LO
E7 (Register address 999)
Preset Data HI
00
Preset Data LO
01
Error Check (CRC)
-
Table 7.29
Response
The normal response is an echo of the query, returned
after the register contents have been passed.
Field Name
Example (HEX)
Slave Address
01
Function
06
Register Address HI
03
Register Address LO
E7
Preset Data HI
00
Preset Data LO
01
Error Check (CRC)
-
Table 7.30
7.10.6 Preset Multiple Registers (10 HEX)
Description
This function presets values into a sequence of holding
registers.
Query
The query message specifies the register references to be
preset. Register addresses start at zero, i.e., register 1 is
addressed as 0. Example of a request to preset two
registers (set parameter 1-24 = 738 (7.38 A)):
RS-485 Installation and Set...
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HVAC Drive Design Guide
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