Datasheet > RDL2_12

RDL2_12

更新时间： 2022-03-19 14:14:38

品牌	Logo	应用领域
RADIOMETRIX		/
页数	文件大小	规格书
7页	463K
描述
UHF Multi Channel Wide Band FM Transceiver

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数据手册

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RDL2_12 数据手册

TXE pin 15

Active low enables transmitter. It has a 10kΩ pull-up to Vcc. (if used in RX only, tie this pin to +5v)

TXD

pin 14

This is a 5V CMOS logic level input. It can be directly interfaced to data output of a UART in a

microcontroller. TXD does not have an internal pull-up.

NC pin 13

There is no pin in this position.

RXD

pin 12

This is a 5V CMOS logic level output. It can be directly interfaced to data input of a UART in a

microcontroller.

SETUP pin 11

Pull low to enter test/setup mode. This is only sampled at power-up, and on tx>rx or rx>tx transitions. The

pullup only enables at these times.

Programming the RDL2

As supplied, the RDL2 is set to default channel zero. To change this preset, it is necessary to enter

setup/program mode.

The RDL2 is programmed through the same TXD / RXD pins that is used for sending/receiving data. An

RS232 terminal emulator (such as Aterm or HyperTerminal) is an ideal tool.

To connect to a true RS232 device, inverting RS232-CMOS level shifters must be used. Maxim MAX232 or

equivalent are ideal, but simple NPN transistor switches with pull-ups often suffice. With typical

microcontrollers and UARTs, direct connection is possible.

To enter program mode the SETUP pin (pin 11) must be held low at turn-on, or during a change of TXE pin

state. In this mode the radio link is disabled, but the TXD / RXD pins become a 9600 baud programming

interface. (Bytes received are echoed back on the RXD pin).

In 'setup' the unit will only respond to certain command strings:

CHAN0 to CHAN4 <CR>:

These commands select one of 5 preset channels

A RDL2 will only communicate with a unit set to the same channel.

Channel number is stored in volatile memory. On power-up the RDL2 reverts to the default in EEPROM (as

supplied this is always Channel 0)

SETPROGRAM <CR>:

Writes the current address and current channel into EEPROM as the new

default.

A tilda character (~, ascii 126dec) sent by the unit indicates end of

EEPROM write sequence

(these commands are normally only used for factory diagnostics)

NOTONE <CR>:

LFTONE <CR>:

HFTONE <CR>:

# <CR>:

Transmit unmodulated carrier

Transmit carrier modulated with 8KHz squarewave

Transmit carrier modulated with 16KHz squarewave

Transmitter off

A Carriage Return ‘<CR>’ (00Dhex) should be entered after each command sequence to execute it.

Releasing the SETUP pin to high state returns the RDL2 to normal operation.

Radiometrix Ltd

RDL2 Data Sheet

page 4

1 2 345 6 7

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