Beijer Electronics NA-9379 - Manual (Page 69)

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MODBUS Programmable I/O NA-9379 FnIO S-Series
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A.3.8. 15 (0x0F) Write Multiple Coils
This function code is used to force each coil in a sequence of coils to either ON or OFF in a remote device. The
Request PDU specifies the coil references to be forced. Coils are addressed starting at zero. A logical '1' in a bit
position of the field requests the corresponding output to be ON. A logical '0' requests it to be OFF.
The normal response returns the function code, starting address, and quantity of coils forced.
• 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 0x10 0x10 “10” 0x31, 0x30
Starting Address Lo 0x00 0x00
“00”
0x30, 0x30
Quantity of Outputs Hi 0x00 0x00 “00” 0x30, 0x30
Quantity of Outputs Lo 0x0A 0x0A “0A” 0x30, 0x41
Byte Count 0x02 0x02
“02”
0x30, 0x32
Output Value #0 0x55 0x55 “55” 0x35, 0x35
Output Value #1 0x01 0x01 “01” 0x30, 0x31
Error Check (CRC/LRC) - 0x21, 0XC9
“78”
0x37, 0x38
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 0x10 0x10
“10”
0x31, 0x30
Starting Address Lo 0x00 0x00 “00” 0x30, 0x30
Quantity of Outputs Hi 0x00 0x00 “00” 0x30, 0x30
Quantity of Outputs Lo 0x0A 0x0A “0A” 0x30, 0x41
Error Check (CRC/LRC) - 0xD1, 0x6A “D0” 0x44, 0x30
End of Frame - t1-t2-t3 CR, LF 0x0D, 0xA
- In case of address 0x1015~0x1000 output bit value: 00000000_00000000 changes to 00000001_01010101.