B - 2 MTP850 TETRA Handportable Terminal / Basic Service Manual CONNECTOR PIN FUNCTIONS
Mode Select (Option1 and Option2):
The following logic levels can be used to select the requested CE Bus mode:
MODE OPTION_1 OPTION_2 USB_PWR AUDIO_IN
NORMAL (no accessory) 1 1 0 X
USB Accessory/Computer 1 1 >4.0V 1
USB accessory / RS232 (6 wire) 1 1 >4.0V 0
Dumb Accessory 1 0 X 1
USB OTG 1 0 X 0
RS-232 (8 wire)/IDB Smart Cable 0 1 X 1
Bluetooth (RS-232 (4 wire) / SSI) 0 1 X 0
PTT 0 0 X X
SB9600
Diode connected from Option 2
to 1
XX
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