C24 Hardware Interface Manual
Version 0.3
FIGURE 13 – UART1 interface signals
TXD_N
RXD_N
RTS_N
CTS_N
DTR_N
DSR_N
DCD_N
RI_N
21
11
9
15
19
13
17
23
Module
DCE
TXD
RXD
RTS
CTS
DTR
DSR
DCD
RI
DTE
UART
The primary UART supports the baud rates 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, and
115200 bps.
Auto baud rate detection is not supported. Default baud rate is 1115200 bos.
All flow control handshakes are supported: hardware, software, or none.
Parity bit and Stop bit definitions are also supported.
The UART default port configuration is 8 data bits, 1 stop bit and no parity, with hardware flow control and
auto baud rate detect enabled.
2.6.2 Secondary UART (UART2)
The module’s secondary UART is a standard 4-signal bus, which only provides data and flow control
signals. The secondary UART is used for all the communications with the module – AT commands
interface, Data Calls and CSD data, programming and software upgrades.
The UART signals are active low CMOS level signals. For standard RS232 communications with a PC, an
external transceiver is required.
The module is defined as a DCE device, and the user application is defined as the DTE device. These
definitions apply for the UART signals naming conventions, and the direction of data flow, as described in
the following figure.
FIGURE 14 – UART2 interface signals
The secondary UART supports the baud rates 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600,
and 115200 bps.
Auto baud rate detection is not supported. Default baud rate is 115200 bps.
All flow control handshakes are supported: hardware, software, or none.
Parity bit and Stop bit definitions are also supported
Motorola General Business Use
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