B - 2 MTP700/MTP750 Portable Radios / Basic Service Manual CONNECTOR PIN FUNCTIONS
Pin Name Function Description
1 EXT_SPEAKER+ OUT Speaker + (pin 1) and Speaker - (pin 2) are used for the external speaker.
Typical output power is 0.5W for a 20 ohm load.
2 EXT_SPEAKER- OUT Speaker + (pin 1) and Speaker - (pin 2) are used for the external speaker.
Typical output power is 0.5W for a 20 ohm load.
3 OPT_B+ OUT With a side accessory attached, this pin provides a typical voltage of 7.5V.
It is current limited at 800mA against short circuit protection.
4 EXT_MIC IN This is the external microphone input. Input impedance is 2 kohm with a
biasing voltage of 2.775V and a typical input level of 8 mVrms.
5 SIDE_OPT2 IN SIDE_OPT1, 2 and 3 selects the various radio operation modes with
different accessories.
6. SIDE_OPT1 IN SIDE_OPT1, 2 and 3 selects the various radio operation modes with
different accessories.
7. GND IN/OUT Used as ground.
8 RX_DATA IN RS-232 input data.
9 TX_DATA OUT RS-232 output data.
10 CTS OUT Used as Clear-To-Send in RS-232 communication.
11. RTS IN Used as Request-To-Send in RS-232 communication.
12. SIDE_OPT3 IN SIDE_OPT1, 2 and 3 selects the various radio operation modes with
different accessories.
13. VIBRATOR OUT This is a logic output to enable the vibrator motor in some accessories.
Table B-1 Side Accessory Connector Pin Functions
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