Roving Networks Bluetooth Serial Adapter User's Guide download pdf (Page 25)

RN Commands Version 4.25, 11/1/2007 Page 25 of 25

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Important Notes:

Placing 3.3Vdc into the PIO’s while they are set as outputs will permanently damage the

radio modules. The failure mode is short across GND and VCC. Use a 10KO resistor in

series or a 10KO pull up resistor for input and output PIO’s respectively.

• Make sure to connect a common ground when using the external TX, RX inputs on the

0 – 3.3Vdc.

• For a 3 wire DB-9 interface (tx, rx, gnd only) connect/short CTS to RTS, Factory default

is hardware flow control enabled CTS and RTS connected.

• When using a 5.0Vdc Input, PIO’s require a 10K ohm series resistor. PIO’s are 0-3.3Vdc

not 5 volt tolerant.

• A null modem adapter is required to make a direct connection to a PC serial port.

Power Terminals for Evaluation Board

Inputs on P1 power connector can be 4.5VDC to 11.0VDC. There is internal regulation down

to 3.3VDC for all circuitry. Worst case power draw for the board is 80ma when the Bluetooth

radio/modem connection is established and transmitting. Power can be as low as 1ma to 25ma

average when the Bluetooth radio/modem is not connected depending on parameter settings.

Hardware Communications Connections for Modules and Eval Board

Radio TX à RX of the application Micro Controller Unit (MCU)

Radio RX ß TX of the application Micro Controller Unit (MCU)

Radio RTS à CTS of the application Micro Controller Unit (MCU)

Radio CTS ß RTS of the application Micro Controller Unit (MCU)

LEDs

MODE GREEN LED blink rate

Configuring 10 times per second

Startup/Config Timer 2 times per second

Discoverable/Inquiring/Idle Once per second

Connected Solid ON

The YELLOW LED should blink whenever data is transferred on either the RX or TX pins of the

DB9 serial port. It is a physical monitor of the actual voltage on the pins, and is not driven by

software from the module.

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Roving Networks Bluetooth Serial Adapter User's Guide Page 25