Specifications

WM_PRJ_Q2501_PTS_001 – 003
March 2004
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2.6.1.2 GSM Auxiliary Serial Link
A flexible 4-wire serial interface is available complying with V24 technical
specifications.
In external mode, this serial link is available for application operations (OpenAT
data exchanges for example).
In internal mode, this serial is not available because used within the WISMO
module for GPS control operations.
Pin description
Signal Pin # I/O I/O type Description
GSM_TXD2 38 I CMOS CT103 – Transmit Serial Data
Multiplexed with GPI
GSM_RXD2 40 O 3X CT104 – Receive Serial Data
Multiplexed with GPO2
GSM_RTS2 55 I CMOS CT105 – Request To Send
Multiplexed with GPIO5
GSM_CTS2 44 O 3X CT106 – Clear To Send
Multiplexed with GPIO0
DTE
GSM_TXD2
GSM_RXD2
GSM_RTS2
GSM_CTS2
GND
Q2501 GSM
Auxiliary Serial Link
Figure 14: Auxiliary GSM serial link signals