Read N Bit - JUMO LOGOSCREEN nt Interface Description

4.6.1 Read n bit

Data request
Response
Example
This function is used to read n bits starting from a specific address.
Slave Function
address 0x01 or 0x02
1 byte 1 byte
Slave Function
address 0x01 or 0x02
1 byte 1 byte
The response always comes in full bytes of 8 bits each.
Non-requested bit values will be complemented with the 0 value.
Reading a bit starting from bit address 0x0340 (this is word address 0x0034).
For the addresses please refer to Chapter 7.2 Modbus addresses of important
device and process data, Page 47.
Data request:
01 02 0340
Response:
01 02 01
4 Modbus protocol description
Address
first bit
2 byte
Number of
byte read
1 byte
0001 B85A
01 6048
Bit value
Number Checksum
of bits CRC16
2 byte 2 byte
Bit Checksum
value(s) CRC16
x byte 2 byte
19