Sharp SD-PX2 Manual do Utilizador descarregar pdf (Página 46)

Support Information

M9328MX21ADSE User’s Manual, Rev. A

3-18 Freescale Semiconductor

3.4 UART/RS-232 Connectors

This section describes the DB9 RS-232 serial interface connectors on the ADS. Each serial interface is

controlled by a UART that is either inside the i.MX21 processor or part of an external device.

3.4.1 UART1 Connector

Connector P1 connects to the UART1 pins of the i.MX21 MCU. UART1 is the primary functionality of

the pins. This female DB9 connector is configured for RS-232 DCE operation. Figure 3-5 shows pin

assignments and Table 3-5 provides signal descriptions for the connector.

Figure 3-5. Connector P1 (UART1) DCE Pin Assignments

Table 3-5. Connector P1 (UART1) DCE Signal Descriptions

Pin(s) Signal Description

1 CD CARRIER DETECT — RS-232 output signal, pulled active positive

2 TXD TRANSMITTED DATA — RS-232 serial data output signal

3 RXD RECEIVED DATA — RS-232 serial data input signal

4 DTR DATA TERMINAL READY — RS-232 input signal, the logic level signal is available at TP8

5 GND GROUND

6 DSR DATA SET READY — RS-232 output signal, pulled active positive

7RTS

READY TO SEND — RS-232 input signal, active positive

8CTS

CLEAR TO SEND — RS-232 output signal, active positive

9 RI RING INDICATOR — RS-232 output signal, forced inactive negative

2345

9876

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 63 64

Sem comentários

Sharp SD-PX2 Manual do Utilizador Página 46