Lake Shore Model 331 Temperature Controller User’s Manual
RANGE
Heater Range Command
Input:
RANGE <range>[term]
Format:
n
0 = Off, 1 = Low (0.5 W), 2 = Medium (5 W), 3 = High (50 W)
RANGE?
Heater Range Query
Input:
RANGE?[term]
Returned:
<range>[term]
Format:
n
(Refer to command for description)
RDGST?
Input Reading Status Query
Input:
RDGST? <input>[term]
Format:
a
<input>
Specifies which input to query: A or B.
Returned:
<status bit weighting>[term]
Format:
nnn
Remarks:
The integer returned represents the sum of the bit weighting of the input status flag bits.
A “000” response indicates a valid reading is present.
Bit
Bit Weighting
Status Indicator
0 1
invalid
reading
4 16
temp
underrange
5 32
temp
overrange
6
64
sensor units zero
7
128
sensor units overrange
RELAY
Relay Control Parameter Command
Input:
RELAY <relay number>, <mode>, <input alarm>, <alarm type>[term]
Format:
n,n,a,n
<relay number>
Specifies which relay to configure: 1 or 2.
<mode>
Specifies relay mode. 0 = Off, 1 = On, 2 = Alarms.
<input alarm>
Specifies which input alarm activates the relay when the relay is in alarm
mode: A or B.
<alarm type>
Specifies the input alarm type that activates the relay when the relay is in
alarm mode. 0 = Low alarm, 1 = High Alarm, 2 = Both Alarms.
Example: RELAY
1,2,B,0[term]
– Relay 1 activates when Input B low alarm activates.
RELAY?
Relay Control Parameter Query
Input:
RELAY? <relay number>[term]
Format:
n
<relay number>
Specifies which relay to query: 1 or 2.
Returned:
n,a,n
(Refer to command for description)
RELAYST?
Relay Status Query
Input:
RELAYST? <high/low>
Format:
n
<high/low>
Specifies relay type to query: 1 = Low Alarm or 1 = High Alarm.
Returned:
<status>[term]
Format:
n
0 = Off, 1 = On.
Remote Operation
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