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User's Manual

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3.3. UART ( RS-232 Interface )
This module is provided with interface supporting Standard RS-232 protocol.
DCE(modem) is exchanged with data or control AT-Command through DTE(host).
Pin
NO.
Signal Name
Function
(Modem)
Pin Function Summary
37
TXD2
I
Serial Data Input 2
39
RXD2
O
Serial Data output 2
3.4. USB
It is supported with universal serial bus for high data communication.
It is satisfied with USB2.0 specification and supported with Max.480Mbps
Pin
NO.
Signal Name
Function
(Modem)
Pin Function Summary
29
USB_VBUS
I
Power supply for the USB transceiver
35
USB_D+
I/O
USB differential data (+)
36
USB_D-
I/O
USB differential data (-)
3.5. AUDIO
Modem is provided with condenser mic input, speaker output for voice call
Speaker output can connect with 32Ω speaker
Pin
NO.
Signal Name
Function
(Modem)
Pin Function Summary
23
MIC+
I
Differential Microphone input (+)
24
MIC-
I
Differential Microphone input (-)
25
SPK+
O
Analog Audio Differential Output(+)
26
SPK-
O
Analog Audio Differential Output (-)