DS601-4

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©2004 Reg. No. 227 4001, ENGLAND

Page 2

Smart Com Radio Transceiver IC

RF600T

Pin Descriptions

Pin

Number

Name

Type

Description

1

RxR

In

Received data from RF module.

2

CTS

LOOP

Out

In

Dual Function:

1. Clear to send data (to host) when low.

2

3

LEARN

In/Out

In addressed mode: Used to initiate ‘address learn’ and erase

functions. Drives indicator LED.

4

RTS

In

Request to send data (from host) when low.

5

GND

In

Connect to 0 volts.

6

MODE

In

Device mode, addressed when high, broadcast when low.

7

TxH

In

Serial data from the host, to be sent on the RF path.

8

RxH

Out

Serial data from the RF path to be sent to the host.

9

TxR

HBAUD

Out

In

Dual Function:

1. Transmit data to the RF module.

2. Host baud rate select. See notes below.

10

TXEN

RFBAUD

Out

In

Dual Function:

1. Transmit enable (low) for the RF module.

2

11

RXEN

Out

Receive enable (low) for the RF module.

12

IN1

In

Telemetry logic input #1. (addressed mode only)

13

IN2

In

Telemetry logic input #2. (addressed mode only)

14

Vcc

In

Positive supply voltage connection.

15

OSC2

Out

Connect to 4MHz, 3 terminal resonator.

16

OSC1

In

Connect to 4MHz, 3 terminal resonator.

17

OUT1

Out

Telemetry logic output #1. (addressed mode only)

18

OUT2

Out

Telemetry logic output #2. (addressed mode only)

Operating Modes

The device is capable of operation in one of two modes, either broadcast or addressed. The following description

describes the features of these mode and assumes two identical system nodes ‘A’ and ‘B’ each consisting of an

RF600T and its associated radio transceiver module.

The RF600T must be configured before power up for either the broadcast or addressed mode of operation by

means of the MODE pin (6). Note that for security, broadcast nodes will not receive data from addressed nodes.

Broadcast mode.

This mode allows a host generated data block from node ‘A’ to be transmitted and received by any number of

other nodes. This data is received and verified (for correct Manchester coding and CRC) by the other nodes before

being output to their host devices. Alternately, in the same way the other nodes can send data to node ‘A’. Note

that although any node can initiate a transfer, only one direction of transfer can be active at a given time.

Correct reception of a data packet is not acknowledged and the host nodes have the responsibility of ensuring that

data transfers occur as required by operating some form of message protocol over the half duplex data link.

Addressed mode

This mode allows a host generated data block from node ‘A’ to be transmitted and for the data frame to be

addressed to one other network node – in this case we assume node ‘B’. When the data is received by node ‘B’ it

is verified for correct Manchester coding, CRC and for address match and then an acknowledge message is

transmitted back to node ‘A’. Node ‘A’ then outputs a confirmation to the host in the form of the ASCII character ‘C’