Beijer Electronics NA-9379 - Manual (Page 64)

64
MODBUS Programmable I/O NA-9379 FnIO S-Series
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A.3.5. 5 (0x05) Write Single Coil
This function code is used to write a single output to either ON or OFF in a remote device. The requested ON/OFF
state is specified by a constant in the request data field. A value of FF 00 hex requests the output to be ON. A value
of 00 00 requests it to be OFF. All other values are illegal and will not affect the output.
• 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 0x05 0x05 “05” 0x30, 0x35
Starting Address Hi 0x10 0x10 “10” 0x31, 0x30
Starting Address Lo 0x01 0x01 “01” 0x30, 0x31
Quantity of Outputs Hi 0xFF 0xFF “FF” 0x46, 0x46
Quantity of Outputs Lo 0x00 0x00 “00” 0x30, 0x30
Error Check (CRC/LRC) - 0xD9, 0x5C “E4” 0x45, 0x34
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 0x05 0x05
“05”
0x30, 0x35
Output Address Hi 0x10 0x10
“10”
0x31, 0x30
Output Address Lo 0x01 0x01
“01”
0x30, 0x31
Output Value Hi 0xFF 0xFF
“FF”
0x46, 0x46
Output Value Lo 0x00 0x00
“00”
0x30, 0x30
Error Check (CRC/LRC) - 0xD9, 0x5C
“E4”
0x45, 0x34
End of Frame - t1-t2-t3 CR, LF 0x0D, 0xA
- Output bit of address 0x1001 turns ON.