CONTREX CX-1200 - Manual (Page 296)

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Message Error Response Field
This field consists of one byte. Each bit in the byte may be set to 1 indicating a specific error has
occurred.
Message Error Bits Definitions:
Bit 7 = (1) CRC Failure
Bit 6 = (1) Buffer Overflow
Bit 5 = (1) ETX Not Received/Data Field Error
Bit 4 = (1) Invalid Function/Data Error
Bit 3 = (1) Over-Run Error
Bit 2 = (1) Noise Error
Bit 1 = (1) Framing Error
Bit 0 = (1) Parity Error
Example:
“86” = the number 10000110 (binary) would indicate a CRC failure with Noise errors and Framing
errors occurred when the transmission message was received.
Other Errors Returned From Control Through The Serial Communications
0 (00) = OK
1 (01) = General Data Error
2 (02) = Res Byte Error
3 (03) = Invalid Parameter
4 (04) = String too Long
5 (05) = Out of Range
6 (06) = Not Allowed
7 (07) = Lockout During Run
8 (08) = Not Ready
9 (09) = Block Parameter Error
10 (0A) = Block Value Error
11 (0B) = Block Parameter Memory Limit
12 (0C) = MIN Error
13 (0D) = MAX Error
14 (0E) = Invalid Command (PLC/Control Command Send)
15 (0F) = Invalid Operand (PLC)
16 (10) = <END> Statement Missing (PLC)
17 (11) = PLC Program Memory Limit
18 (12) = Defaults Loaded
19 (13) = Backup Loaded
20 (14) = Backup Saved
21 (15) = Checksum Error
22 (16) = Faults Cleared
23 (17) = Test Passed
24 (18) = Test Failed
25 (19) = No Compare Parameter
26 (1A) = Divide by Zero
27 (1B) = Long Word Overflow
28 (1C) = Parameter Transfer Limit Overflow
29 (1D) = Memory Read request too long
30 (1E) = Data Field Length Error
31 (1F) = Message Function Request/Parameter NOT Processed
32 (20) = Invalid Function Request