DS360-5 March 04

©2004 Reg. No. 227 4001, England

Page 4

BRM01

RS232 Driver

The standard BRM01 device is supplied with a built-in RS232 interface driver. This option allows the BRM to

be connected directly to a PC COM port or similar device. The theoretical maximum baud rate of the module

is 460Kb/s, this is limited by the driver to 230.4kb/s. This is generally not an issue when used in conjunction

with personal computers, since they normally support a maximum baud rate of only 115.2kb/s. Custom

versions of the BRM01 module can be supplied without the RS232 driver, please contact RF Solutions Ltd

for more information.

Antenna

The Standard BRM01 module is supplied fitted with an integrated F type Antenna. Custom versions of the

BRM01 module can be supplied without the internal antenna and with a range of RF connectors for fitting

external antennas, please contact RF Solutions Ltd for more information.

Interfacing To Host

The host may be any suitable device capable of sending and/or receiving serial data using RTS/CTS

handshaking. This might be for example, a handheld microprocessor controlled data terminal or personal

computer.

The minimum requirements are for a 4-wire interface (plus power and ground) from the host device. This

interface is shown below:

TXD – Transmit Data output providing transmit data from the BRM

CTS – Clear to Send. If this input goes false, the BRM will stop

transmitting at the end of the current byte

RXD – Receive Data. Receive data input from the host

RTS – Request to Send. When this output is true, the host may

send data to the BRM

GND – Ground

VCC – 4.0V to 5.5V Power supply

Indicators

For convenience three LEDs provide visual indication of operating status. The equivalent logic outputs are

also available externally. The LED functions are shown in the table below:

LED

State

Meaning

Off

no power or error, perform reset to recover

Flashing (0.5Hz)

virgin device, learning of remote device required

RED

On

power-on-self test successful (ready)

Off

no link

GREEN

On

link present (connected)

Off

no activity

AMBER

Flickering

transmit or receive activity

Learn/CLM Button (SW1)

This momentary switch ensures extremely easy setup for use in basic point to point applications and for

testing. After connecting to a power supply for the first time, devices can be rapidly bonded to each other by

performing the ‘Mutual Learning’ procedure, to provide point to point connectivity. No external hardware or

software is required in order to perform this operation.

This button also provides access to the ‘Command Line Menu’, which allows more complex functions to be

administered using a terminal emulator such as ‘HyperTerminal’ or similar. The equivalent logic input is also

available externally for use by the customer’s application.

H

T

B

M

T

D

R

D

C

S

R

S

R

D

T

D

R

S

C

S

G

D

G

D

V

C

V

C