I'm using an opto triac, specifically the MOC3041, with a zero crossing circuit to switch the Tx pinout on an RS-232 interface.
I have no problems turning it on, but after I unload the input (no input current), the triac doesn't turn off. The load is standard RS-232 voltages (+/- 12V), speed 56k.
Do I need a snubber on the load? If so, how should I calculate the value of the snubber it?
I've already asked a question here on the site and I didn't get the answer.
Here is the original one:
"I have a modem connected to a server through RS232. The server is constantly sending data to the modem, whether the modem is connected or not.
When I try to connect to the modem with another modem the handshaking fails because the server is sending data that gets in the way.
I am looking for a way of stopping the communication between the server and the modem until the modem's DCD line is asserted.
What kind of device or component could be used to design a small passive (no power supply) circuit that could perform this operation?
As far as I can tell it is only the TX line that needs to be interrupted while the modem is off-line."
Hope it is more understandable. Thanks.