Beijer Electronics NA-9379 - Manual (Page 70)

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MODBUS Programmable I/O NA-9379 FnIO S-Series
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A.3.9. 16 (0x10) Write Multiple Registers
This function code is used to write a block of contiguous registers (1 to approx. 120 registers) in a remote device.
The requested written values are specified in the request data field. Data is packed as two bytes per register.
The normal response returns the function code, starting address, and quantity of registers written.
• Request
Field name Example RTU ASCII ASCII (bus line)
Start of Frame - t1-t2-t3 “,” 0x3A
Slave Address 0x07 0x07 “07” 0x30, 0x37
Function Code 0x0F 0x0F “0F” 0x30, 0x46
Starting Address Hi 0x08 0x08 “08” 0x30, 0x38
Starting Address Lo 0x00 0x00 “00” 0x30, 0x30
Quantity of Registers Hi 0x00 0x00 “00” 0x30, 0x30
Quantity of Registers Lo 0x02 0x02 “02” 0x30, 0x32
Byte Count 0x04 0x04 “04” 0x30, 0x34
Register Value #0 Hi 0x11 0x11 “11” 0x31, 0x31
Register Value #0 Lo 0x22 0x22 “22” 0x32, 0x32
Register Value #1 Hi 0x33 0x33 “33” 0x33, 0x33
Register Value #1 Lo 0x44 0x44 “44” 0x34, 0x34
Error Check (CRC/LRC) - 0x3B, 0x12 “31” 0x33, 0x31
End of Frame - t1-t2-t3 CR, LF 0x0D, 0xA
• Response
Field name Example RTU ASCII ASCII (bus line)
Start of Frame - t1-t2-t3 “,” 0x3A
Slave Address 0x07 0x07 “07” 0x30, 0x37
Function Code 0x0F 0x0F “0F” 0x30, 0x46
Starting Address Hi 0x08 0x08 “08” 0x30, 0x38
Starting Address Lo 0x00 0x00 “00” 0x30, 0x30
Quantity of Outputs Hi 0x00 0x00 “00” 0x30, 0x30
Quantity of Outputs Lo 0x02 0x02 “02” 0x30, 0x32
Error Check (CRC/LRC) - 0x43, 0xCE “DF” 0x44, 0x46
End of Frame - t1-t2-t3 CR, LF 0x0D, 0xA
- In case of address 0x0800, 0x0801 output register value: 0x0000, 0x0000 changes to 0x1122, 0x3344.