WM_PRJ_Q2501_PTS_002
- 001
March
2004
confidential ©
Page:
25 / 79
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3.3 GSM/GPRS Base Band part
3.3.1 GSM serial links
The GSM/GPRS Base Band part of the WISMO Quik Q2501 includes two
independent V24/CMOS serial link interfaces:
UART1 (main serial link) which consists in a flexible 8-wire serial
interface complying with V24 standard (TX, RX, CTS, RTS, DSR, DTR,
DCD and RI),
UART2 (auxiliary serial link) which consists in a flexible 4-wire serial
interface complying with V24 standard (TX, RX, CTS and RTS).
Both serial link interfaces (UART1 and UART2) are compliant with V24
standard but not with V28 (electrical interface) due to a 2.8 Volt interface. To
get a V24/V28 (i.e. RS232) interface, the use of an RS232 level shifter device is
required as shown in the following paragraphs.
3.3.1.1
Main GSM Serial Link implementation (GSM_UART1)
Figure 11: Example of RS232 level shifter implementation for GSM UART1
Summary of Contents for WISMO Quik Q2501
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