BT 900 Uživatelský manuál stáhnout pdf (Strana 10)

BT900 Development Kit

Version 1.0

Embedded Wireless Solutions Support Center:

http://ews-support.lairdtech.com

www.lairdtech.com/wireless

Laird Technologies

Americas: +1-800-492-2320

Europe: +44-1628-858-940

Hong Kong: +852-2268-6567 x026

4.3.3 UART Interface Driven by External Source

 UART interface driven by external UART source. The BT900 module UART interface (TX, RX, CTS, RTS) is

presented at a 2.54 mm (0.1”) pitch header (J10). To allow the BT900 UART interface to be driven from the

breakout header connector (J10):

- The development board must be powered from a DC jack (CN1) or AAA batteries (J7) and switch SW4

must be in DC position.

- The FTDI device must be held in reset which is achieved automatically by removal of USB cable or SW4 is in

the DC position.

- Micro-DIP switch CON13 allows the four BT900 UART pins to be physically isolated as well from USB-UART

FTDI device. Physical micro-DIP switch body has text “ON” on the closed side. By default, CON13 is closed.

Figure 4: USB to UART Interface and Header to UART interface

 J10 pin-out is designed to be used with an external FTDI USB to UART TTL (3.3V) convertor cables:

http://www.ftdichip.com/Products/Cables/USBTTLSerial.htm

E.g. FTDI manufacturer part number for cable: TTL-232R-3V3

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BT 900 Uživatelský manuál Strana 10