control multiple device with single serial port

[ccb]

I have a vb software that writes data to comport. Now i can attach one device and use the software to control the device. If i want to connect multiple serial devices to the same com port and braodcast the data to all com ports how can i do it.
Can i just wire all the serial devices in parallel .Any one has tried this? or knows of some technical site which does this. Note that i dont want to write/address to individual serial device. I jst want to broadcast to all serial devices..thru one comport on my pc.

[PdB]

If its for experimental use, you can do this.
Take the Tx signal from your computer and route that to all Rx inputs of the slave devices.
Do not tie together the outputs of the devices to your PC.
You may need to use a null-modem setup on the computer-side to resolve a possible flow-control issue (handshaking).
If the load is an issue (your computer is to weak to electrically drive all devices), you can drive your RS-232 signal using some electronics.

[PdB]

If its for experimental use, you can do this.
Take the Tx signal from your computer and route that to all Rx inputs of the slave devices.
Do not tie together the outputs of the devices to your PC.
You may need to use a null-modem setup on the computer-side to resolve a possible flow-control issue (handshaking).
If the load is an issue (your computer is to weak to electrically drive all devices), you can drive your RS-232 signal using some electronics.