Lakeshore 340 - Page 126

Lake Shore Model 340 Temperature Controller User’s Manual
9-28 Remote Operation
CLIMIT Configure Control Loop Limit Parameters
Input: CLIMIT <loop>, [<SP limit value>], [<positive slope value>], [<negative slope value>],
[<max current>], [<max range>]
Returned: Nothing
Remarks: Configure control loop limits.
<loop> Specifies which loop to configure.
<SP limit value> Specifies loop setpoint limit and at what reading the loop turns off
output.
<positive slope value> Specifies maximum positive change in output.
<negative slope value> Specifies maximum negative change in output.
<max current> Specifies maximum current for loop 1 heater output (Paragraph
6.12.1). Valid entries: 1 = 0.25 A, 2 = 0.5 A, 3 = 1.0 A, 4 = 2.0 A.
<max range> Specifies maximum loop 1 heater range (Paragraph 6.13.3). Valid
entries: 0 - 5.
Example: CLIMIT 1, 325.0, 10, 0[term] - Control Loop 1 limits the setpoint to 325, turns off output when
the reading (based on the setpoint units) reaches 325, limits the change in the output to
+10% with no limit on the output going down.
CLIMIT? Query Control Loop Limit Parameters
Input: CLIMIT? <loop>
Returned: <SP limit value>, <positive slope value>, <negative slope value>, <max current>, <max
range>. Format: ±nnn.nnnE±n,nnn.n,nnn.n,n,n[term]
Remarks: Returns parameters for control loop limits. See the CLIMIT command for parameter
descriptions. <loop> specifies which loop to query.
CMODE Configure Control Loop Mode
Input: CMODE <loop>, <mode>
Returned: Nothing
Remarks: Configures the control mode for a control loop.
<loop> Specifies which loop to configure.
<mode> Specifies the control mode. Valid entries:
1 = Manual PID, 2 = Zone, 3 = Open Loop,
4 = AutoTune PID, 5 = AutoTune PI, 6 = AutoTune P.
Example: CMODE 1, 4[term] - Control Loop 1 uses PID AutoTuning.
CMODE? Query Control Loop Mode
Input: CMODE? <loop>
Returned: <mode>. Format: n[term]
Remarks: Returns the control mode for a control loop. See the CMODE command for parameter
descriptions. <loop> specifies which loop to query.
COMM Configure Serial Interface Parameters
Input: COMM [<terminator>], [<bps>], [<parity>]
Returned: Nothing
Remarks: Configures the serial interface parameters.
<terminator> Specifies the terminator: 1 = <CR><LF>, 2 = <LF><CR>, 3 = <CR>, 4 = <LF>.
<bps> Specifies the bits per second (bps) rate. Valid entries: 1 = 300, 2 = 1200, 3 = 2400,
4 = 4800, 5 = 9600, 6 = 19200
<parity> Specifies communication parity. Valid entries: 1 = 7 data bits, 1 stop bit, odd parity;
2 = 7 data bits, 1 stop bit, even parity; 3 = 8 data bits, 1 stop bit, no parity.
Example: COMM 1, 6, 3[term] - After receiving the current terminator, the instrument responds at
19,200 bps using 8 data bits, 1 stop bit, no parity, and <CR><LF> as a terminator.