Uart3 (Dtm3, Dfm3) - Wavecom GR64 GSM/GPRS Integrator's Manual

5.11.2 UART3 (DTM3, DFM3)

The reason UART2 is skipped is that GR64 does not support more than two UART
interfaces. The removed interface was represented by UART2 for the GR47/48, so for
legacy reasons the second UART in GR64 is called UART3.
Pin
43
44
UART 3 consists of a full duplex serial communication port with transmission and
reception lines.
Timing and electrical signals characteristics are the same as for UART1, DTM1 and
DFM1, including the baud rate range and the capability to auto-baud.
5.11.2.1 Transmitted Data (DTM3)
DTM3 is used by the application to send data to the Wireless CPU via UART3. It has
the same electrical characteristics the equivalent signal in UART1.
5.11.2.2 Received Data (DFM3)
DFM3 is used to send data to the application via UART3. It has the same electrical
characteristics as the equivalent signal in UART1.
GR64 Integrators Manual
Page: 63/104
Name Direction
DTM3 Input
DFM3 Output
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Function
Data To Wireless CPU from host (UART3)
Data From Wireless CPU to host (UART3)