Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual
Remote Operation
4-11
4.3.1 Operational Commands Description
Below is a list of MPS Operational Commands which configure the various functions.
ERR? Error Status Query
Input: ERR?
Returned: [OVP] [RI] [STEP]
Remarks: Returns 0 if the error is inactive or 1 if it is active. Returns three characters plus up to two
terminators.
IMAX Programs Upper Current Limit
Input: IMAX [current] where [current] = a value between 0 and +50 A (620), 0 and +125 A (622),
0 and +155 A (623), or 0 and +72 A (647).
Remarks: Programs the upper (soft) current limit of the MPS. Truncates the value to the 0.001 place. The
initial condition is +000.0000 A. The current limit is always forced to a plus. Setting is limited by
product limits. Control Bus inputs 4 places, display rounds to 0.01 or 0.001 place.
IMAX? Current Limit Query
Input: IMAX?
Returned: A number between 0 and +50 A (620), 0 and +125 A (622), 0 and +155 A (623),
or 0 and +72 A (647).
Remarks: Nine characters plus up to two terminators are returned. Value is shown as
a “+,” but applies to both positive and negative entries.
IOUT? (I?) Output Current Query
Input: IOUT? or I?
Returned: A number between 0 and ±50 A (620), 0 and ±125 A (622), 0 and ±155 A (623),
or 0 and ±72 A (647).
Remarks: Returns nine characters plus up to two terminators.
ISET (I) Enter Output Current
Input: ISET [current] or I [current] where [current] = a value between 0 and ±50 A (620),
0 and ±125 A (622), 0 and ±155 A (623), or 0 and ±72 A (647).
Remarks: Value is truncated to the 0.001 place. Initial condition is +000.0000 A. Setting is limited by
IMAX. Control Bus inputs 4 places, display rounds to 0.01 or 0.001 place.
ISET? Output Current Setting Query
Input: ISET?
Returned: A number between 0 and ±50 A (620), 0 and ±125 A (622), 0 and ±155 A (623),
or 0 and ±72 A (647).
Remarks: Returns nine characters plus up to two terminators.
IV? Output Summary Query
Input: IV?
Returned: [IOUT], [VOUT], [STB], [I MODE], [V MODE]
Remarks: Returns twenty-seven characters plus up to two terminators.
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