This is from the Sx 200 Installation Manual (page 22)
5-5: Internal GPS Settings
The internal GPS provides serial data at 9600 baud in the NMEA0183B format. The output from this GPS is wired to pin 32. It may be shared between all GRT EFIS display units as desired, as well as at least two other devices, such as an ELT, transponder, etc…. If these other devices impart too much load on the serial output, the signal level will be reduced. This could result in some, or potentially all, of the devices failing to receive data.