User's Manual

APPLICANT: MOTOROLA, INC. FCC ID: IHDT6AC1

Exhibit 8

RTCM, Antenna power

Note:

1. The Audio Out line is used to send out the detected audio

and as a toggle On/Off pin.

2. The TS line is used to turn On the units by any transaction

from Low to high in this pin.

3. The GPS is mounted on top of theD15 and receive power from

the D15 but it is a stand-alone unit. The GPS is working from

3V and the RXD/TXD lines are working in 3V levels as well. The

GPS receiver used is M12 (Motorola).

3.2.2 Connector pin out

Pin # Function Pin # Function

1 TX_EN 19 SIM I/O

2 GPS RXD (out) 20 SIM CLK

3 GPS TXD (in) 21 TS

4 TXD 22 DSC_EN

5 RXD 23 Down Link

6 DTR 24 Up Link

7 DCD 25 Analog Ground

8 RTS 26 Ground

9 CTS 27 Ground

10 DSR 28 Ground

11 RI 29 Ground

12 Manual_Test 30 VCC

13 Audio In 31 VCC

14 On/Off + Audio Out 32 VCC

15 N.U. 33 VCC

16 SIM _PD 34 GPS Antenna Voltage 3/5 Vdc

17 SIM _VCC 35 RX for diff. GPS RTCM

18 SIM_Reset 36 GPS 1pps