Digilent PmodBT2 Manuale utente

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PmodBT2™ ReferenceManual

RevisedAugust17,2011

ThismanualappliestothePmodBT2rev.A

DOC#: 502-214

Other product and company names mentioned may be trademarks of their respective owners.

Page 1of 3

Overview

The PmodBT2 is a powerful peripheral module employing the Roving Networks® RN-42 to create a fully integrated

Bluetooth interface.

1 FunctionalDescription

The PmodBT2 uses a standard 12-pin connection and communicates via UART. There is a secondary SPI header on

the board for updating the RN-42 firmware if needed.

1.1 JumperSettings

The PmodBT2 has several modes available to the user via jumper settings. JP1 through JP4 provide various modes

of operation as indicated in Table 1 below. Each jumper is active when shorted. JP1 restores the device to factor

default settings after three transitions of the jumper setting (short-to-open or open-to-short). After the third

transition, the device returns to factor default except for the Bluetooth name. The other three jumpers, JP2-JP4,

only sample in the first 500 ms of operation to allow the pins that they tie to on the RN-42 module to serve a

separate purpose later in the modules operation. JP2 enables pairing with a special device class defined by the

user in software. This may be used so that the PmodBT2 operates as a substitute for an RS232 cable. JP3 enables

auto connect to a stored address defined by the user. Finally, JP4 chooses whether to operate at the stored baud

rate (115.2kbps default) or a baud rate of 9600 regardless of the software selected rate when shorted. For more

detailed information on jumper settings and functionality, refer to the RN-42 user manual.

The PmodBT2.

Bluetooth 2.1/2.0/1.2/1.1 compatible

Simple UART Interface

A wide range of modes including: Slave Mode, Master

Mode, Trigger Master Mode, Auto-connect Master Mode,

Auto-connect DTR Mode, and Auto-connect ANY Mode.

Small form factor: 1.5" x 0.8"

Features include:

PmodBT2™ Reference Manual

Other product and company names mentioned may be trademarks of their respective owners.

Page 2of 3

Jumper

Description

JP1 (PIO4)

Factory Default

JP2 (PIO3)

Auto Discovery/Pairing

JP3 (PIO6)

Auto Connect

JP4 (PIO7)

Baud Rate Setting (9600)

Table 1. Set jumper description.

Roving

Network

RN-42

RTS

RXD

TXD

CTS

GND

VCC

STATUS

VCC

RST

GND

1 2

VCC

JP1

JP2

JP3

7JP4

MISO

VCC

MOSI

SCK

GND

Figure 1. PmodBT2 block diagram.

1.2 UARTInterface

By default, the UART interface uses a baud rate of 115.2 kbps, 8 data bits, no parity, and a single stop bit. The

startup baud rate may be customized to predefined rates or set to a specific user customized baud rate.

Predefined baud rates range from 1200 to 921k.

The reset pin (RST) on J1 is active low. If the RST pin is toggled, the device will undergo a hard reset. This hard reset

performs similarly to a power cycling of the device. The second interface besides the standard UART signals is the

STATUS pin also on J1The STATUS pin directly reflects the connection status of the device. STATUS is driven high by

the device when connected and is driven low otherwise.

For more information on the devices UART interface and RST and STATUS pins refer to the RN-42 user manual on

the Roving Networks website.

1.3 CommandMode

In order to enter the command mode, the PmodBT2 must receive "$$$" to which it will respond "CMD". When in

command mode, the module will respond to a large number of commands allowing the user to customizing the

PmodBT2™ Reference Manual

Other product and company names mentioned may be trademarks of their respective owners.

Page 3of 3

module for specific applications. In order to exit command mode, send "---<cr>" (three minus signs in a row and

where <cr> stands for the carriage return character) to which the device will respond "END". Remote

configuration, or configuration over a Bluetooth connection, is possible through the command mode but has

several restrictions. The configure time, which defaults to 60 sec, defines the time window in which the PmodBT2

may be configured remotely. Outside of this time, the PmodBT2 will not respond to any remote commands. It is

important to note that any of the "set" commands available for the PmodBT2 must be followed by a power cycle

to take effect in any design.

Connector J1 –UART Communications

Signal

Description

RTS

Ready to Send

Receive

Transmit

CTS

Clear to Send

GND

Power Supply

Ground

VCC

Power Supply

(3.3V)

STATUS

Connection Status

~RST

Reset

Not Connected

GND

Power Supply

Ground

VCC

Power Supply

(3.3V)

Connector J2 –SPI Connector (Firmware Update Only)

MISO

Master in/ Slave

out

MOSI

Master out/ Slave

SCK

Serial Clock

~CS

Chip Select

VCC

Power Supply

(3.3V)

GND

Power Supply

Ground

Table 2. Connector descriptions.

The various modes of operation are accessed by using the "SM,<5,4,3,2,1,0>" command while in command mode.

The PmodBT2 can be put into one of six available modes of operation. The modes in order, 0 to 5, are: slave,

master, trigger master, auto-connect, auto-connect DTR, and auto-connect ANY. For more detailed information on

the different modes of operation, refer to the RN-42 user manual. For the full list of device commands, how to use

remote configuration, and more detailed information on the different modes of operation, see the RN-42 data.

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