BT 900 User Manual download pdf (Page 12)

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

Micro DIP switch CON12 allows the 4 x UART signals from the FTDI chip (USB_DSR, USB_DTR, USB_DCD, USB_RI) to

be disconnected from reaching the BT900. By default the DIP switch is open.

Since BT900 nAutoRUN pin 3 is connected to PC FTDI USB_DTR line, the Micro DIP switch:

 CON12 (pin 2-6) must be CLOSED (in ON position) to allow the PC (using uWTerminal) to control nAutoRUN

(pin 3 on BT900); with no jumper fitted to J6 (see Figure 6).

 CON12 (pin 2-6) must be OPEN to allow nAutoRUN (pin3 on BT900) to be controlled by J6 (with jumper fitted

to J6 pin 1-2) to select nAutoRUN (Figure 7).

Figure 6: Micro DIP switch CON12 closed (nAutoRUN controlled by PC)

Note: The additional lines of the DIP switch CON12 are not currently utilised and need to remain open, as shown

in Figure 6.

Figure 7: Micro DIP switch CON12 open (nAutoRUN controlled by J6 jumper on pin 1-2)

4.5 OTA (Over the Air)

smart

BASIC application download

It is possible to download

smart

BASIC applications over the air to the BT900. To enable this feature, SIO_19 must

be pulled low to GND externally (on power up).

On the development board, header connector JP4-pin 8 brings out the BT900 SIO_19; JP4-pin 9 brings out GND.

To pull BT900 SIO_19 low (to GND), connect JP4-pin 8 (SIO_19) to JP4-pin 9 (GND) by fitting a fly-lead between these

pins.

Refer to latest FW release (v1.9.2.0) documentation and

smart

BASIC user manual for details. Additionally, Laird has

authored an Application Note explaining how to download applications over the air. All of these materials are

available in the documentation tab of the BT900 product page at www.lairdtech.com/products/BT900-Series.

4.6 VSP (Virtual Serial Port) connection to Host device

VSP allows the remote wireless device to bridge to the host device UART that is connected to the BT900 UART.

SIO_19 pin must be pulled low externally to GND (on power up) to enable the VSP (Virtual Serial Port over BLE) for

connection to the host device.

Refer to latest FW release (v1.9.2.0) documentation and

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BASIC user manual) for details.

nAutoRUN

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BT 900 User Manual Page 12

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