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RPC2A: DescriptionUHF Radio Packet Controller; File Size908KB，27 Pages; ManufacturerRadiometrix Ltd.; Websitehttp://www.radiometrix.com/

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RPC2A Overview

UHF Radio Packet Controller

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Radiometrix

Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England

20 April 2007

Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233

RPC2A

UHF Radio Packet Controller

Modules: RPC2A-433-64: IC+BiM2A-433-64-S

IC’s:

RPC-000-DIL:

RPC-000-SO:

RPC-000-SS:

18 pin DIL IC

18 pin SO IC

20 pin SSOP IC

The RPC2A-433-64 is intelligent transceiver

modules, which enable a radio network/link to

be simply implemented between a number of

digital devices. The module combines a UHF

radio transceiver and a 64kbps packet

controller.

•

Crystal controlled PLL FM circuitry for both Tx and Rx

Reliable 75 meter in-building range, 300m open ground

Built-in self-test / diagnostics / status LED’s

Complies with ETSI EN 300 220-3

Complies with ETSI EN 301 489-3

Single 5V supply @ < 27mA

64kbps half duplex

Free format packets of 1 - 27 bytes

Packet framing and error checking are user transparent

Collision avoidance (listen before transmit)

Direct interface to 5V CMOS logic

Power save mode

The RPC2A-module

NTRODUCTION

The RPC2A is an enhanced replacement for original RPC-433-40 transceiver. It is a self-contained plug-

on radio port which requires only a simple antenna, 5V supply and a byte-wide I/O port on a host

microcontroller (or bi-directional PC port).

The module provides all the RF circuits and processor intensive low level packet formatting and packet

recovery functions required to inter-connect an number of microcontrollers in a radio network.

A data packet of 1 to 27 bytes downloaded by a Host microcontroller into the RPC2A's packet buffer is

transmitted by the RPC2A’s transceiver and will "appear" in the receive buffer of all the RPC2A's within

radio range.

A data packet received by the RPC2A’s transceiver is decoded, stored in a packet buffer and the Host

microcontroller signalled that a valid packet is waiting to be uploaded.

transmit / receive

download

HOST

upload

figure 1: RPC2A + Host

-controller

RPC2A

upload

HOST

Radiometrix Ltd, RPC2A

page

1. F

UNCTIONAL

ESCRIPTION

On receipt of a packet downloaded by the Host, the RPC2A will append to the packet: Preamble, start

byte and a error check code. The packet is then coded for security and mark:space balance and

transmitted through the BiM2A Transceiver as a 64kbps synchronous stream. One of four methods of

collision avoidance (listen before TX) may be user selected.

When not in transmit mode, the RPC2A continuously searches the radio noise for valid preamble. On

detection of preamble, the RPC2A synchronises to the in-coming data stream, decodes the data and

validates the check sum. The Host is then signalled that a valid packet is waiting to be unloaded. The

format of the packet is entirely of the users determination except the 1st byte (the Control Byte) which

must specify the packet type (control or data) and the packet size. A valid received packet is presented

back to the host in exactly the same form as it was given.

To preserve versatility, the RPC2A does not generate routing information (i.e.

source/ destination addresses) nor does it handshake packets. These network

specific functions should be performed by the host.

Additional features of the RPC2A include extensive diagnostic/debug functions for evaluation and

debugging of the radio and host driver software, a built in self test function and a sleep mode / wake-up

mechanism which may be programmed to reduce the average current to less than 100µA. The operating

parameters are fully programmable by the host and held in EEPROM, the host may also use the

EEPROM as a general purpose non-volatile store for addresses , routing information etc.

1.1 O

PERATING STATES

The RPC2A has four normal operating states:

•

DLE

SLEEP

HOST TRANSFER

TRANSMIT

RECEIVE

DLE

LEEP

The

DLE

state is the quiescent/rest state of the RPC2A. In

DLE

the RPC2A enables the receiver

and continuously searches the radio noise for message preamble. If the power saving modes

have been enabled the RPC2A will pulse the receiver on, check for preamble and go back to

LEEP

if nothing is found. The 'ON' time is 5ms, OFF time is programmable in the RPC2A’s

EEPROM and can vary between 22ms and 2.9s. The TX Request line from the Host is constantly

monitored and will be acted upon if found active (low). A TX Request will immediately wake the

RPC2A up from

LEEP

mode.

OST

RANSFERS

If the host sets the TX Request line low a data transfer from the Host to the RPC2A will be

initiated. Similarly the RPC2A will pull RX Request low when it requires to transfer data to the

Host (this may polled or used to generate a Host interrupt).

The transfer protocol is fully asynchronous, i.e. the host may service another interrupt and then

continue with the RPC2A transfer. It is desirable that all transfers are completed quickly since

the radio transceiver is disabled until the Host <> RPC2A transfer is completed. Typically a fast

host can transfer a 27 byte packet to / from the RPC2A in under 1ms.

Radiometrix Ltd, RPC2A

page

RPC2A Related Products

	RPC2A	RPC-000-DIL	RPC-000-SS	RPC-000-SO
Description	UHF Radio Packet Controller	UHF Radio Packet Controller	UHF Radio Packet Controller	UHF Radio Packet Controller

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