Serial Port trigger

Hi,
I need help with a idea as follows

I have a pager connected to a vibration sensor and when the pager vibrates the sensor will close sending a + 5v to pin 2 which should trigger the a comm event on the serial port which will start a VB program to make a phone call.

will the +5v cause the com event to trigger, is it safe to apply +5V to pin 2 in the first place.
any ideas on this would be of great help

Duf

RS232 port is designed for +/-25V.
Range +3..25V is considered '0' and -3...25V is considered '1'.
applying +5V would be considered zero.
VB can detect com events such as character received etc.
I don't think using data lines (pins 2 and 3) is good idea.
Even if you would apply negative voltage such as -5V, you would
have to pulse it to simulate transfer of one character and trigger event
for VB. I would bring signal to one of hardware handshaking inputs
on the com port.

Hi there,

U need to have a level converter to convert the RS232 voltage level to
TTL 5V before inerfacing to serial port. (http://www.geocities.com/bagtool/rs232.html)


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You can use the CTS or DSR lines to detect a high on those particular pins.

I dont know if the pins trigger a comm event,but you sure can monitor them through VB

ice* said:

You can use the CTS or DSR lines to detect a high on those particular pins.

I dont know if the pins trigger a comm event,but you sure can monitor them through VB

Click to expand...

You can detect CTS or DSR signal and make a trigger a routines in your computer program, visit the site below,

www.geocities.com/bagtool/serial_basic.html

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