Deep Sea Electronics Plc 550 User Manual

55xGenComm1_29
11
Exception response message
Byte Field name Notes
0 Slave address
1 Function code +128 (131) Top bit is set
2 Exception code 1 - Illegal function code
2 - Illegal data address
6 - Slave device busy
3 –4 Error check CRC
Unimplemented register and field values
Size of register Value returned Notes
1 bit flag within a register 0 No third state exists for a flag to indicate
it is not valid
2 bit named digital
input/output code
3 Unimplemented input/output
4 bit alarm condition codes 0xF Unimplemented alarm
4 bit LED colour code 0xF Unimplemented LED
16 bit unsigned, any scale 0xFFFF The largest number
16 bit signed, any scale 0x7FFF The largest positive number
32 bit unsigned, any scale 0xFFFFFFFF The largest number
32 bit signed, any scale 0x7FFFFFFF The largest positive number
ASCII strings “ ” A string of spaces (Unicode 0x0020),
NULL terminators are not used
Unicode strings “ ” A string of spaces (Unicode 0x0020),
NULL terminators are not used

Deep Sea Electronics Plc 550 Specifications

General

Brand	Deep Sea Electronics Plc
Model	550
Category	Controller
Language	English