Fastrax uPATCH100 Valid receiver configurations: uPatch100-R4 RS232 levels @ 4800 baud uPatch100-R9 RS232 levels @ 9600 baud uPatch100-C4 CMOS levels @ 4800 baud uPatch100-C9 CMOS levels @ 9600 baud Pin Signal Name In/Out Description 1. VDD Power +3.3V~E+5.5V Main power supply 2. TXD0 Out UART Port 0, Transmit Data, RS232 or CMOS level 1) 3. RXD0 In UART Port 0, Receive Data, RS232 or CMOS level 1) 4. GND Ground Power and Signal ground 5. XRESET In Not connected, Reserved for future use 6. VBAT Power +3.3V~E+5.5V Battery Backup Power supply 7. 1PPS Out 1 Pulse Per Second Output, CMOS level 2) 8. GPIO9 Out Satellite Fix indicator output, CMOS level 2)