User's Manual

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RS-232 (8 wire) 0 1 X
Table 5 main connector lines
Notes:
Default state is internally set by the modem via pull up resistors.
To configure the modem for USB operation, the host terminal should only apply >4V to RTS1/USB_PWR pin.
To configure the modem for RS-232 operation, the host terminal should only pull OPTION1 pin to ground level.