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[on:]

Hi,

I am trying to connect a finger probe sensor to the arduino uno r3 board. The sensor i am looking at and have researched for in the last couple of days is a nellcor ds-100 which has an RS 232 interface (DB9 connector). Now there are two problems i face.

(Problem 1) How can i connect it to the board?

Explanation: I came across http://www.beepbee.com/rs232-serial-port-to-ttl-converter-communication-module-for-arduino-p-32150.html#.UUIVZzeyLbd
and this seems like a possible solution.

But do how do i connect the 6 pins to the board. According to my understanding VCC, GND and SIGNAL pin should be enough for a sensor to give the output.

(Problem 2) Am i supposed to process the output?

Explanation: Do i feed the output from the ttl module directly into my board or do some processing before that? I am thinking about feeding the output to a software oscilloscope like Xocillio <Link http://code.google.com/p/xoscillo/>

Please help (Alternate solutions would be appreciated too).
--
Priyankar

[Reply #1 on:]

For question 1: just use the Rx and Tx pins, they are the UART pins. It's all serial, so use Serial.print or read for communication. You have to set the baudrate to a known speed, e.g 9600.

BUT: are you sure it's serial communication? I think they just use the DB9 connector because it has 9 pins, not for serial communication.
See: http://pinouts.ru/forum/index.php?topic=4679.0