Lakeshore 620 User Manual
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Lake Shore Model 620/622/623/647 Magnet Power Supply User’s ManualRemote Operation4-84.2.1 Serial Interface Hardware ConfigurationBelow is a technical description of the 6224 option card for the Serial Interface configuration. (Note: SeeAppendix C for Serial Interface on CMP.) Table 4.2 defines communication parameters. Terminators are fixedto 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 200110-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 foradapter wiring.Table 4-2 Serial Interface SpecificationsTransmission: Three-Wire Bits per Character: 1 Start, 8 Data, 1 StopBaud Rate: 300, 1200 or 9600 Timing Format: AsynchronousParity Type: None Connector: Two RJ-11 Modular SocketFixed Terminator: CR (0DH) LF (0AH) Transmission Mode: Half DuplexData Interface Levels: Transmits & Receives Using EIA Voltage Levels4.2.2 Serial Interface SettingsTo use the Serial Interface, set the Baud rate. Pressthe Function Menu key, then press the function keycorresponding to INTERFACE SETUP to display thescreen to the right. Use the cursor keys to move thearrow indicator to RS232C. Press the Data Entry upor down arrows to cycle between 300, 1200, or 9600Baud. The remainder of the parameters are fixed atNo Parity, 8 Data Bits, and 1 Stop Bit.4.2.3 Sample BASIC Serial Interface ProgramThe QuickBASIC V4.0 program in Table 4.3 is a sample interactive serial poll routine for the MPS SerialInterface. 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,622,0,120193ENTER COMMAND? ISET 25;IOUT? Output Current Setting and Query. Instructs unit to setcurrent to 25 amps and then asks for current reading.+24.9975AENTER COMMAND? OVP? Overvoltage (Quench) Protection Circuit Status Query. Unitreturns setting, where 0 = Off and 1 = On.0ENTER COMMAND? RI? Remote Inhibit Status Query. Unit returns setting, where0 = Inactive and 1 = Active.0ENTER COMMAND? MODE? Mode Status Query. Instrument returns mode, where0 = Local, 1 = Remote, or 2 = Remote with Lockout.1 # ! # $ # % & ' ( ) ) * ) ' ( ) ) + ) ' ( # # % & |
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