I am connecting this to an Arduino. (once Arduino programmed I removed the USB connector as it shares the serial comms with Pin0&1)
VCC <-> 5V
GND <-> GND
Seems simple enough. However when I connected the DB9 port to the actual serial device I could clearly see the serial data being sent to the RS232 (RedRX LED was active) but nothing was coming back from the actual device I was connecting to.
I then connected the device to my laptop & hyper-terminal to test I could communicate with it. Sent the same commands as I was getting the Arduino to do... And yes I was getting the correct responses from the device.
I then connected the Arduino+SparkFun RS232 to Hyper-Terminal and loaded up a basic program into Arduino that a) sends a welcome message and then b) sends a message each time it receives a character via the serial interface (one of the example sketches of the Arduino). The result I am getting is the welcome message only, the SparkFun RS232 is not seeing anything I send back from Hyper-Terminal.
Is it faulty or am I missing a vital trick to getting it working properly?
Thank you for any help.
edit: I should also add that this morning I tested pins 0 & 1 with a simple LED blink sketch to prove the arduino pins were functioning (which they were).
This is Kellenjb- I am having a hard time easily seeing what cases are working versus not working. Rather than writing a long and hard to follow comment or an answer that isn't an answer, I am going to add it here and have the OP or someone else correct me if I have understood wrong.
Arduino Sparkfun Shifter -> Serial Device (No Go) Serial Device -> Arduino Sparkfun Shifter (Go) Serial Device -> Laptop (Go) Laptop -> Serial Device (Go) Arduino Sparkfun Shifter -> Laptop (Go) Laptop -> Arduino Sparkfun Shift (No Go)