User Guide

PAMS Technical Documentation Data Module RL7
Company Confidential TME-3
Issue 4 12/03 Nokia Corporation. Page 9
The baseband supports external microphone inputs and speaker outputs. Input and out-
put signal source selection and gain control is performed by the UEM according to con-
trol messages from the UPP. Analog and digital PCM audio are routed to M2M system
connector.
EMC shielding for baseband is implemented using metal lids. On the other side the mod-
ule is shielded with PWB grounding. Heat generated by the circuitry is conducted out via
the PWB ground planes.
Modes of Operation
The TME-3 has three modes of operation:
• RS-232 Mode (M2M system mode)
• Application mode (AT command mode)
• User Control mode
Internally the RL7 module has the following operating modes:
• NO_SUPPLY
• POWER_OFF
•POWER_ON
• RESET
•SLEEP
• PROTECTION
RS232 mode
Fig. 2 shows TME-3 in RS-232 mode. TME-3 enters RS-232 mode in powerup when it
detects a 68k 1% pull-down resistor at M2M system connector pin 21.
In RS-232 mode TME-3 is connected to DAU-12 RS-232 adapter. The adapter provides a
standard RS-232 interface. Power for TME-3 and the adapter is fed through TME-3 DC
jack.