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If you can provide at least one additional control line you can use this scenario:
Transmission from 1 channel to 2-channels can be done without any problems.
Reception from 2-channels to 1 will require this additional control line and 3-state RS-232 transceivers or CMOS/TTL gates.
This control line will select which channel will be read from.
Any other alternative, such as stand alone spliter is just to complicated, as there is no information on which channel should be read.
Regards,
IanP
If yo want to get better answer , please be more precise.
Problems:
distance, hand shaking, arbitrage, galvanic separation, uni/bi directional transmission,
describe the task.
It means that you rather need a "RS232 monitor"
In term of hardware you can just connect second PC com ports in paralell to monitor the RS232 port (You can consider to use optoisotation).
If I understand your post correctly, you need to transmit data from 1>>1 and from 1>>2. And this is what I stated in my previous post: for transmission you dont need any additional hardware: just connect both RX lines to your TX line.
Regards,
IanP
If you can provide at least one additional control line you can use this scenario:
Transmission from 1 channel to 2-channels can be done without any problems.
I would sugest to add the AND gate for the signals "ready to receive" that are sent from two receivers to the transmitter.
(In some transmission protocols without this signal the transmitter will not start the transmission).
Of course you can assume that RS232 is such a slow transmission, that receivers are always reagy to read the data.
This is true in many cases, but not all. For example printer without the input data buffer are slower, that RS232 data rate.
In general the whole "hand shaking" system (4 signals) should be considered.
The good start point is to identify the number of wires necessary to cary on the transmission. (it can be from 1 to 6 = Rx, Tx DSR, RTS,...)
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