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 6-37
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