Omega OSP SERIES - Manual (Page 46)

46
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.
15.1 Digital 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 :
5 V
Rx IRtec P
Female miniDIN connector
(case mounted - external view)
Dig. ground
Anal. ground
Analog Output
Tx IRtec P
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.
Front view
1 2
3
4 5 6
7
8
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
15.2 TTL 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: