Chapter Nine: RS-232 Communications
Error Messages
287
Error Messages
If the 146 instrument cannot execute a command, it will respond with an error message.
Error Code Summary
Error Code
Description
E111
Unrecognized command
E112
Inappropriate command
E122
Invalid data field
E131
Bad checksum
Table 85: Error Code Summary
E111: Unrecognized Command
An “unrecognized command” error message will occur if the command syntax is incorrect. The
146 instrument cannot interpret the command string. The syntax error is located in the first four
bytes of the command.
E112: Inappropriate Command
The 146 instrument will return an “inappropriate command” error message if the command
cannot be executed on the selected channel or at this time. Examples of inappropriate commands
include attempting to:
•
Read a channel that is turned off
•
Zero an ion gauge (Ion gauges cannot be zeroed)
•
Read a channel that is out-of-range
•
Read a hot cathode gauge that is performing a high power degas
•
Perform a degas procedure on a channel that is not connected to a hot cathode gauge
•
Span a Pirani gauge that has the gas type set to argon or helium (A Pirani can only be
spanned if the gas type is set to nitrogen.)
•
Enter the Auto (or PID) control mode with the recipe select command set to “none”
E122: Invalid Data Field
An “invalid data field” error message indicates a problem with the data field of the command
string. The data field can contain a maximum of 26 characters. If your data field exceeds 26
characters, the 146 instrument will return an invalid command error message. Other possible
causes of an invalid command error message include an invalid data range, or a data field that
contains numbers instead of letters, or vice versa.
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