following a link from another post I have been researching some RS232 basics and my question is:
In general the articles I have read state that pin 2 - on the female side - going to the pc is the Recieve data pin, so it should receive byte data coming in, correct?
Pin 5 is designated as the signal ground in the PC side of the cable?
So if I have my documentation correct on the device that is broadcasting the signal and it states that pin 8 is the transmitting data out from device pin and pin 2 is the power and signal ground pin
should my pin to pin mapping not look like this:
REC pin 2 <- Trans pin 8
Grd pin 5 <-> Grd pin 2
I ask, because thats what I built and I am getting nothing. I have a known good program that receives serial input from the port on the same pc, from a basic stamp devices that uses standardized pin out protocols. There are other pins in the device documentation that state for data into device or power transmitted from the device, but I did not include those pins in my cable because I did not think they would be necessary, which could be causing my problem if I am wrong.
Device Pin Out:
1 +12volts from power supply
2 Poewr and signal ground
3 +8 volts from counting unit
4 Data in from optional hand cord
5 (not used)
6 (not used)
7 RS232 Data in (to counting unit)
8 RS232 Data out(from counting unit)
9 (not used)
As always any help or ideas are greatly appreciated.