Using one GPS module simultaneously in two devices

Question

Electronics

There is a GPS module GT-1613-MTR used in the DVR, it uses three pins: GND, VCC and TX.
I want to use this module as a USB GPS at the same time, by connecting an additional TX output to the COM->USB converter on the PL2303 and already connecting it to the USB of the computer. But, probably, in addition to TX, you also need to connect the GND ground, since they most likely will not be closed somewhere else.
Questions arose:
1) Is it possible to directly close the ground of PL2303 and the registrar, or is some kind of decoupling needed, maybe diodes;
2) If you want the GPS module to work like a USB GPS without turning on the recorder, is it possible to untie the power somehow, I think you need two diodes, cathodes to VCC - GPS module, and anodes to the recorder and PL2303, respectively. Nothing will happen if the power turns on for both devices?

Answer 1

here the guy did this on optocouplers: www.getchip.net/posts/adapter-usb-to-k-line-na-baz...
You only need to take tx.
There is also a discussion about this: not all optocouplers are equally useful because of the speed
roboforum.ru/forum2/topic4438.html

Answer 2

1) ground can be connected
2) I would advise using a relay. The registrar is on - the module is powered from it, off - from usb
ps
my answer should not be considered true, this is IMHO

Answer 3

Thanks