Martel Electronics LC-110/H - Manual (Page 44)

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22) Busy
The loop device is temporarily busy performing some internal
operation. The command was ignored by the loop device. Try the
command again later. HART response code 32.
23) Command not implemented
The HART command has not been implemented in this loop device.
The command was ignored by the loop device. HART response
code 64.
24) Character parity
The loop device detected a character parity error in one or more
characters received. The command was ignored by the loop device.
Try the command again. If the error persists, check the power and
connections to the loop device. HART response code 192 (hex C0).
25) Character over run
The loop device detected a general communications error. The
command was ignored by the loop device. Try the command again.
If the error persists, check the power and connections to the loop
device. HART response code 160 (hex A0).
26) Character framing
The loop device detected a character framing error in one or more
characters received. The command was ignored by the loop device.
Try the command again. If the error persists, check the power and
connections to the loop device. HART response code 144 (hex 90).
27) Check byte bad
The command received by the loop device did not contain a valid
check byte per the HART protocol definition. The command was
ignored by the loop device. Try the command again. If the error
persists, check the power and connections to the loop device. HART
response code 136 (hex 88).
28) Buffer overflow
The loop device detected a general communications error. The
command was ignored by the loop device. Try the command again.
If the error persists, check the power and connections to the loop
device. HART response code 130 (hex 82).