15 DIGITAL INTERFACE
The OSP portable IR thermometer can be equipped with a digital interface.
The interface circuit is essentially based on the serial communication interface subsystem (SCI) on the chip of the microcontroller. The output voltage levels are TTL at 0 to +5 V.
An optional adapter to convert the voltage level from 0 to +5 V to RS232 standard levels can be supplied. This adapter is required to interface OSP with a Personal Computer.
15.1Digital output wiring practice
The wiring to digital output signals is made through a mini DIN connector mounted on the lower end of the case. The pertinent connections are indicated below :
Rx IRtec P
Tx IRtec P
Dig. ground
Analog Output
Anal. ground
5 V
Female miniDIN connector
(case mounted - external view)
For easy interconnections a miniDIN connector with cable (cat. EE420123) can be supplied on request. The color codes of the conductors can change with different suppliers; please check before using.
6 5 4
8
73
1 2
Front view
| LINDY | CINCH |
pin 1 : | brown | black |
pin 2 : | red | green |
pin 3 : | green | blue |
pin 4 : | gray | gray |
pin 5 : | purple | yellow |
pin 6 : | blue | white |
pin 7 : | orange | red |
pin 8 : | yellow | brown |
15.2TTL to RS 232 adapter
The cat. BB530001 TTL to RS232 adapter consists of a cable to which are connected a male mini DIN connector (for OSP) and a DB25 connector, that contains the electrical circuitry (for the PC).
The basic circuit and connections are as follows:
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