Lakeshore Learning Materials 622 - Manual (Page 46)

Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual
Remote Operation 4-8
4.2.1 Serial Interface Hardware Configuration
Below is a technical description of the 6224 option card for the Serial Interface configuration. (Note: See
Appendix C for Serial Interface on CMP.) Table 4.2 defines communication parameters. Terminators are fixed
to Carriage Return (CR) and Line Feed (LF).
The serial interface connector is a standard 6-wire RJ-11 (telephone) jack. Lake Shore offers the Model 2001
10-foot Cable Assembly, Model 2002 RJ-11 to DB-25 Adapter, and the Model 2003 RJ-11 to DE-9 Adapter.
See Chapter 5 for Serial I/O connector and adapter pinouts, and for RJ-11 pinouts. See Paragraph 5.7 for
adapter wiring.
Table 4-2 Serial Interface Specifications
Transmission: Three-Wire Bits per Character: 1 Start, 8 Data, 1 Stop
Baud Rate: 300, 1200 or 9600 Timing Format: Asynchronous
Parity Type: None Connector: Two RJ-11 Modular Socket
Fixed Terminator: CR (0DH) LF (0AH) Transmission Mode: Half Duplex
Data Interface Levels: Transmits & Receives Using EIA Voltage Levels
4.2.2 Serial Interface Settings
To use the Serial Interface, set the Baud rate. Press
the Function Menu key, then press the function key
corresponding to INTERFACE SETUP to display the
screen to the right. Use the cursor keys to move the
arrow indicator to RS232C. Press the Data Entry up
or down arrows to cycle between 300, 1200, or 9600
Baud. The remainder of the parameters are fixed at
No Parity, 8 Data Bits, and 1 Stop Bit.
4.2.3 Sample BASIC Serial Interface Program
The QuickBASIC V4.0 program in Table 4.3 is a sample interactive serial poll routine for the MPS Serial
Interface. Below are typical examples using this BASIC program. (User input is in bold type.)
ENTER COMMAND? *IDN?
Identification Query. Returns manufacturer, model number,
0, and Firmware Date.
LSCI,622,0,120193
ENTER COMMAND? ISET 25;IOUT?
Output Current Setting and Query. Instructs unit to set
current to 25 amps and then asks for current reading.
+24.9975A
ENTER COMMAND? OVP?
Overvoltage (Quench) Protection Circuit Status Query. Unit
returns setting, where 0 = Off and 1 = On.
0
ENTER COMMAND? RI?
Remote Inhibit Status Query. Unit returns setting, where
0 = Inactive and 1 = Active.
0
ENTER COMMAND? MODE?
Mode Status Query. Instrument returns mode, where
0 = Local, 1 = Remote, or 2 = Remote with Lockout.
1
I N T E R F A C E S E T U P :
¤ I E E E A D D
T R M S / E O I
R S 2 3 2 C
C B D E F
C B A D D
V W A N G L E
M F I D
O U T P U T S : *
+1.999A : 1 2
: (CR LF) EOI
: 9 6 0 0 , N , 8 , 1
: 9 6 0 0 , 0 , 7 , 1
: 0
: 9
: 6 2 2 ( 1 )
¥
¥
¥
¥
¥
+ 0 . 0 0 1 V