Omega Multifunction Indicator-Simulator Digital Interface, Digital interface data program mode

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10 DIGITAL INTERFACE

The CL526 portable calibrator is equipped with a digital interface. The interface circuit is essentially based on the serial communication interface subsystem (SCI) on the chip of the microprocessor. The output voltage levels are TTL at 0 to +5 V.

An optional adaptor to convert the voltage level from 0 to +5V to RS232 levels can be supplied on request. This adaptor is required to interface the CL526 with a Personal Computer.

10.1Digital interface data program mode

To enter the procedure, press the <ENTER> + <ON> keys. The display will indicate:

CAL? 65388 N=0

To enter the program mode press the <2> key;

Baud Rate 19200

The numerical value of the “baud rate” can be one of the following : 19200, 9600, 4800, 2400, 1200, 600, 300

Select, with the <▲> or <▼> key the “baud rate” used by the receiver unit and transmission lines.

Press the <2> key to memory load the baud rate.

The display will indicate:

ID-Name : 1

The number represents the address code assigned to the instrument.

Press the <▲> or <▼> key to select a number from 00 to 99.

Press the <2> key to memory load the programmed value.

The display will return to the original indication:

CAL? 65388 N=0

To exit the procedure press the <OFF> key.

10.2Digital output wiring practice

The wiring to the digital output signals is made through a mini DIN connector mounted on the lower end of the case. The pertinent connections are indicated below.

Tx

ground

Rx

ground

5 V

Female miniDIN connector (case mounted - external view)

For easy interconnections a miniDIN connector with cable (cat. EE420123) con be supplied on request. The conductors color codes can change with different supplier; please check before using.

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Contents CL526 OMEGAnetSM On-Line Service Internet e-mail Info@omega.com Introductory Note Table of Contents Digital Interface General Performance Specifications Dimensions 120x60x230 mm Weights net 1 Kg Power supplyBattery life Battery voltage32 to +302F ± 0.02% of rdg +0.18F Table of ranges and accuracyGeneral Features Case Physical Description + 5 V for logic and analog circuits 5 V for analog circuits Power supplyFunctional Description Input circuit Digital to analog converter MicroprocessorFirmware Digital displayResistance and Rtd measurements Battery charger. Operation from line sourceThermocouples input-output circuit Resistance and Rtd simulationUnpacking Out 1248.3C Tc PRE-OPERATIONAL CheckElectrical Connections Wiring practiceExamples of input /output wiring and connections Thermocouple wiresClass Limit of Error of thermocouple wiresBattery Line Op Power SupplyBattery Charger How to maximize the battery lifeOperation & Applications Power onBattery voltage indication Operating mode set upOut 0.0C TcK OUT mode selectionParameter or sensor selection 1032.2C TcKDecimal point position International Temperature ScaleRj mode Tecnical unitIN-OUT data memories Data memory configurationAverage readings Data memory automatic scanning Data memory manual recallSimulation cycle selection Manual step advanceAutomatic simulation cycle 0mV Time 0h 0m 50sStart 0.0mV End 100.0mVSimulation cycle Rj compensation mode checkProg Mode Linear Mode SquareScale factor program RJ 0.0C extWord psi Word hPa Word mbarExternal Rj compensation Installation parameter procedureFirmware version code Serial number Baud Rate Digital interface data program modeDigital output wiring practice Digital InterfaceComputer CL526 TTL to RS 232 adapterCommunication protocol from CL526 to a PC Data InstructPage Ramp = OHM Computer request for CL526 settingsMode InstrDis/Lin STO 2 #D 127 202 Display Chksum = DATA1 + DATA2 + Data 3 + Data 4 .AND.7F Example a Communication programsExample a data transfer from CL526 to PC Example B PC instructions to CL5263ØØ While LOC 1 = Ø Wend Error Checksum MaintenanceSafety recommendations Faulty operating conditionsStorage Protection fusesIndex WARRANTY/DISCLAIMER Temperature