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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