Benchtop Serial I/O
7/30/2015 3:30 PM
Page 4
Read Error Number
?ER
Description
Returns the current error number relating to system shutdown.
Prerequisites
Requires Benchtop firmware revision 1.05 or greater.
Syntax
?ER
Parameters
None
Remarks
Data Returned
?ER
returns one of several values indicating the reason(s) that the
system shut down. The value returned can be any one, or an algebraic
combination, of several of the following:
VALUE
DESCRIPTION
0
No error
1
Expansion Valve not closing
2
Flow Valve not Closing
4
No Supply Pressure
8
Reservoir Needs Water
16
PreSat Water Empty
32
Low Pressure Underrange
64
Low Pressure Overrange (Chamber Pressure)
128
High Pressure Underrange
256
High Pressure Overrange
288
Pressure Transducer Failure
320
Low Pressure Overrange (Saturation Pressure)
480
Pressure Transducer Misalignment
16896
Saturation Temperature Underrange
17408
Presaturator Temperature Underrange
18432
Expansion Valve Temperature Underrange
20480
Chamber Temperature Underrange
24576
Reference Temperature Underrange
-16384
Cabinet Temperature Overrange
-24576
Reference Temperature Overrange
-28672
Chamber Temperature Overrange
-30720
Expansion Valve Temperature Overrange
-31744
Presaturator Temperature Overrange
-32256
Saturation Temperature Overrange
-32768
Temperature Overrange
Examples
After an unexpected system shutdown (indicated by the value returned
from the
?RU
command or the last parameter in the
?
command), the
?ER
command is used to determine the nature of the failure:
computer sends
?ER
<CR>
benchtop responds
4
<CR><LF>
The "4" returned indicates that the system lost supply pressure.
