Digi TRK-RF-08 Manuel D'utilisation page 11

3. Label Information
4. Interface
Interface pin assignments
1
2
3
4
Notes:
1. The I/O pins is connected to the external interface port directly
2. The voltage level is TTL high/low voltage level.
VDD
D-
D+
GND
9
TRK-RF-08 User Manual