User Manual

GSM/GPRS Module Series
GC10 Hardware Design
GC10_Hardware_Design Confidential / Released 35 / 76
The Debug port:
 DBG_TXD: Send data to the COM port of computer.
 DBG_RXD: Receive data from the COM port of computer.
The logic levels are described in the following table:
Table 6: Logic Levels of the UART Interfaces
Table 7: Pin Definition of the UART Interfaces
Parameter Min. Max. Unit
V
IL
0 0.3×VDD_EXT V
V
IH
0.7×VDD_EXT VDD_EXT V
V
OL
0 0.3×VDD_EXT V
V
OH
0.7×VDD_EXT VDD_EXT V
Interfaces Pin Name Pin NO. Description
UART Port
TXD 9 Transmit data
RXD 10 Receive data
RTS 11 Request to send
CTS 12 Clear to send
DTR 7 Data terminal ready
DCD 8 Data carrier detection
RI 6 Ring indication
Debug Port
DBG_TXD 31 Transmit data
DBG_RXD 30 Receive data