User manual

Appendix E - ZEUS Modem details

Issue E 113

The following table shows the functions of control/status pins on the host interface:

EXP1_GPIO Signal name Dir Active Function

7 PTT Output High Push To Talk. See note 1

8 GSM_ON Input See note 2 Modem enable

9 GSM_STS Output High Modem ON/OFF status

10 GPS_ON Input High GPS module enable

11 GPS_PSUON Input High Not Used (PU keeps it at logic ‘1’)

12 GPS_BOOT Input NA Not Used (PU keeps it at logic ‘1’)

13 GPS_PPS Output NA GPS Pulse Per Second

Only available with iDEN modules.

Please see the datasheet of the particular module used. GSM_ON is inverted

when used with iDEN modules (GSM_ON=’0’ – iDEN module is on).

J9 –iO270 audio/PTT connector

Connector: NELTRON 2417RJ-8-F4, 8-way 2mm header

Mating connector: JST PHR-8, 8-way 2mm housing, female

Mating crimps: JST SPH-002T-P0.5S

Pin Signal name

1 SPKR-

2 SPKR+

3 3V_OPT

4 VCC

5 GND

6 PTT

7 MIC-

8 MIC+

As viewed from the connector pins