Output Request Commands - Lakeshore 818 User Manual

4.2.2

Output Request Commands

S
(818 Only) Query Sensor Reading, Alarm Setpoints, and Alarm Status
Input: S
Returned: ±<Reading><Units>,±<Alarm 1 Setpoint>,±< Alarm 2 Setpoint >,<Alarm 1 Status>,
<Alarm 2 Status>
Remarks: Units = K (Kelvin), C (Celsius), F (Fahrenheit), or V (Volts). Alarm Status = A (Active) or
I (Inactive)
WA
Query Switch ID and Alarm Data
Input: WA
Returned: Model 818: <Switch ID>,±<High Alarm Setpoint>,±<Low Alarm Setpoint >.
Model 819: <Switch ID>,±<Channel 1 High Alarm Setpoint>,±<Channel 1 Low Alarm
Setpoint>,±<Channel 2 High Alarm Setpoint>,±<Channel 2 Low Alarm
Setpoint>,±<Channel 3 High Alarm Setpoint>,±<Channel 3 Low Alarm
Setpoint>,±<Channel 4 High Alarm Setpoint>,±<Channel 4 Low Alarm Setpoint>.
Remarks: Switch ID = 0 to 7. For Model 819 only, equals the sum of 2 if alarm is set plus 4 for relay
latching.
WD
Query Sensor Reading(s)
Input: WD
Returned: Model 818: ±<Reading><Units>.
Model 819: ±<Channel 1 Reading><Units>,±<Channel 2 Reading><Units>,±<Channel 3
Reading><Units>,±<Channel 4 Reading><Units>.
Remarks: Units = Kelvin (K), Celsius (C), Fahrenheit (F), or Volts (V).
WS
Query Sensor Reading and Alarm Status
Input: WS
Returned: Model 818: ±<Reading><Units>,<High Alarm Status>,<Low Alarm Status>.
Model 819: ±<Channel 1 Reading><Units>,<Channel 1 High Alarm Status>,<Channel 1
Low Alarm Status>,±<Channel 2 Reading><Units>,<Channel 2 High Alarm Status>,
<Channel 2 Low Alarm Status>,±<Channel 3 Reading><Units>,<Channel 3 High Alarm
Status>,<Channel 3 Low Alarm Status>,±<Channel 4 Reading><Units>,<Channel 4 High
Alarm Status>,<Channel 4 Low Alarm Status>.
Remarks: Units = K (Kelvin), C (Celsius), F (Fahrenheit), or V (Volts). Alarm Status = A (Active) or
I (Inactive)
WY
Query Scan Data
Input: WY
Returned: Model 818: N indicating no scanner.
Model 819: <Scan Status>,<Current Channel>,<Channel 1 Dwell Time Index>,<Channel
2 Dwell Time Index>,<Channel 3 Dwell Time Index>,<Channel 4 Dwell Time Index>.
Remarks: Scan Status = H (Holding) or S (Scanning). Channel = 0 to 4. Dwell Time Index: 0 = 0
seconds (skip), 1 = 5 seconds, 2 = 10 seconds, 3 = 30 seconds, 4 = 60 seconds.
4-2
Lake Shore Model 818 / 819 Cryopump Monitor User's Manual
Remote Operation