Beckhoff BC8050 - Page 67

RS232 - Interface
BC8050 und BC8150 67Version: 3.0.0
Query
Byte Name Example
Start - frame - - ":" 0x3A
Address 11 0x0B "0B" 0x30, 0x42
Function code 3 0x03 "03" 0x30, 0x33
Start address high 8 0x08 "08" 0x30, 0x38
Start address low 0 0x00 "00" 0x30, 0x30
Count high 0 0x00 "00" 0x30, 0x30
Count low 2 0x02 "02" 0x30, 0x32
Error check, LRC/
CRC
0xC6, 0xC1 "E8" 0x45, 0x38
End - frame t1-t2-t3 CRLF 0x0D, 0x0A
The Fieldbus Box Coupler Box responds with byte count 4, i.e. 4bytes of data are returned. The query was
for 2 analog channels, and these are now distributed over 2 words. In the analog output process image, the
first channel has the value 0x3FFF, while the second channel has the value 0x0.
Response
Byte Name Example
Start - frame - - ":" 0x3A
Address 11 0x0B "0B" 0x30, 0x42
Function code 3 0x03 "03" 0x30, 0x33
Byte Count 4 0x04 "04" 0x30, 0x34
Data 1 high byte 63 0x3F "3F" 0x33, 0x46
Data 1 low byte 255 0xFF "FF" 0x46, 0x46
Data 2 high byte 0 0x00 "00" 0x30, 0x30
Data 2 low byte 0 0x00 "00" 0x30, 0x30
Error check, LRC/
CRC
0xC6, 0xC1 "B0" 0x42, 0x30
End - frame t1-t2-t3 CRLF 0x0D, 0x0A