Autonics BFC Series, User Manual

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1 Modbus RTU protocol
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1.7 Preset Multiple Registers(Func 16–10H)
Writes the Binary data of Holding Registers (4X reference) consecutively in Slave device.
(1) Query (Master)
Slave
Address Function
Starting Address No. of Register
Byte Count
Data(Data) Data(Data)
Error Check
(CRC16)
Hi
(Upper)
Lo
(Lower)
Hi
(Upper)
Lo
(Lower)
Hi
(Upper)
Lo
(Lower)
Hi
(Upper)
Lo
(Lower) Lo
Hi
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
(2) Response (Slave)
Slave
Address
Function
Starting Address No. of Register Error Check(CRC16)
Hi(Upper) Lo(Lower) Hi(Upper) Lo(Lower) Lo(Lower) Hi(Upper)
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
If writing “10(A H)” in common to the range of Holding Register 400001(0000 H) to 400002(0001
H) on Slave(Address 17) from Master.

Query (Master)
Slave
Address Function
Starting Address No. of Register
Byte
Count
Data(Data) Data(Data)
Error Check
(CRC16)
Hi
(Upper)
Lo
(Lower)
Hi
(Upper)
Lo
(Lower)
Hi
(Upper)
Lo
(Lower)
Hi
(Upper)
Lo
(Lower) Lo
Hi
11 H 10 H 00 H 00 H 00 H 02 H 04 H 00 H 0A H 00 H 0A H ## H ## H

Response (Slave)
Slave
Address
Function
Starting Address No. of Register Error Check(CRC16)
Hi(Upper) Lo(Lower) Hi(Upper) Lo(Lower) Lo(Lower) Hi(Upper)
11 H 10 H 00 H 00 H 00 H 02 H ## H ## H
Please use the Single Register Write function rather than Multi Register Write function if you use
the slave(device) connecting with external devices such as PLC, Graphic Panel, except in the
case of download that presets the minimum/maximum or basic value of parameter by Input
specifications in PC Loader Program.
CRC16
CRC16