How to split a RS 232 Signal

[231MJ]

I'm trying to drive two devices off a Garmin SL30 nav radio.  Has anyone had success splitting an RS 232 signal?  How did you do it?

Thanks  

[jamesm]

De-Pin the RS232  TX | RX signal from the connector (TX| RX depends on which prospective you are looking from) then split/splice it.  I am not big a fan of this method but due limited signals I don't have much choice however Garmin does this a lot.

[rklems]

You can split an RS-232 signal easily with just a splice. You can have one transmitter feeding several receivers, but you cannot have several transmitters feeding one receiver. So the issue you would run in to is that the serial indicator for a SL30 requires a transmit and a receive, so while the SL30 could transmit data to multiple receivers, the OBS selection being transmitted back to the SL30 can only come from one device.

[Aerodon]

27 minutes ago, rklems said:

You can split an RS-232 signal easily with just a splice. You can have one transmitter feeding several receivers, but you cannot have several transmitters feeding one receiver. So the issue you would run in to is that the serial indicator for a SL30 requires a transmit and a receive, so while the SL30 could transmit data to multiple receivers, the OBS selection being transmitted back to the SL30 can only come from one device.

Not only that but the transmit and receive formats need to be th same for all devices.  Not much of an issue with the SL30, but with a GPS, the receivers all need to be set to receive the same format and speed.

[231MJ]

Thanks, guys.  I'm trying to feed Nav data to a single Dynon HDX and a uAvionix AV-30.  I only adjust the OBS on the radio itself so it seems like splitting the signal is going to work.  

[Old Chub]

I use the Ground Modules and Terminal Junction Modules from Amphenol to share data bus signals.  These can be purchased from Digikey or Mouser.