Field Name
Example (HEX)
Slave Address
01 (frequency converter address)
Function
0F (write multiple coils)
Coil Address HI
00
Coil Address LO
10 (coil address 17)
Quantity of Coils HI
00
Quantity of Coils LO
10 (16 coils)
Error Check (CRC)
-
Table 8.27
8.10.4 Read Holding Registers (03 HEX)
Description
This function reads the contents of holding registers in the
slave.
Query
The query message specifies the starting register and
quantity of registers to be read. Register addresses start at
zero, that is, registers 1-4 are addressed as 0-3.
Example: Read
3-03 Maximum Reference
, register 03030.
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 - (
3-03 Maximum Reference
is 32 bits
long, i.e. 2 registers)
Error Check (CRC)
-
Table 8.28
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 000088B8=35.000=15 Hz.
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 8.29
8.10.5 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, that is, 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 8.30
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 8.31
RS-485 Installation and Set...
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