K8055 K8056 Communicating Via RS232

Kits PC Related Projects
1

Newbie to electronics.

I want to be able to send RS232 commands from K8055 (aka VM110 USB Experiment Interface Board) to K8056 (8 Channel remote relay card).

RS232 seems to require the following comm lines.

  1. Transmit data
  2. Receive Data
  3. Request to send
  4. Clear to send.

From the K8055 side, this will be emulating the following pc pins
Txd (Pin 3) Transmit data.
Gnd (Pin 5) Ground

Does this mean that the K8056 never sends a signal, and therefore only receives. In effect, it is a cut down RS232 protocol.

Finally, is it possible to send the required instructions sequence with the K8055 card through one digital output.

Thanks for your patience

2

It is not possible due to the low update rate of the digital outputs of the K8055. The output update time interval is about 10ms.
The baud rate for the K8056 is 2400 bit/sec.

3

If you want to control the K8056 and your PC is not equipped with a serial port then you can add a USB to serial converter (e.g. http://www.velleman.be/ot/en/product/view/?id=353050