Reflex Anybus CompactCom Original Operating Manual page 23

4. Convert the decimal number 7d into binary,  5.5.1 "Convert number system", 
– Decimal 7 equals binary 0111.
5. Based on the binary code 0111 and index, read off whether the low water switch is ON or OFF.
– Decimal 7 = binary
– Parameter index:
– Read direction:
• Bit value 1 is located at numbering 2 position (second bit, table 2).
– 1 = ON
 The low water switch is ON!
You can find the index in table 2,  5.5 "Read bit addresses",  22.
•
• To read out the binary code,  5.5.2 "Read out binary code",  24.
0 1 1 1
↑ ↑ ↑ ↑
3 2 1 0
<-----------------------------------
Anybus® - CompactCom / Modbus-RTU® — 08.11.2022 - Rev. B
24.
(bit numbering from right to left)
Connecting the bus module
English — 23