Radiometrix Ltd

DX series control boards

page 3

DRX board

Outputs

5A 30VDC or 8A 250VAC mains rated Single Pole Double Throw (SPDT)

changeover relay. Normally Open (NO), Normally Closed (NC), Common

(COM)

LED indicator for 'relay energised'

Supply

12V (10-15V)

receive/idle current (depends upon radio module fitted)

20mA with NRX2-434.650-5 fitted

relay current +20mA when activated

Radio modules

Any SIL pinout receiver (NRX1B, NRX2B, WRX2C, RX2A, RX2G, RX3A,

RX3G)

Size

98 x 32 x 16mm

(3.3mm diameter mounting holes are provided)

Operating modes

Device operation is set up by a 3 pin jumper on the receiver board, selecting latched on/off or

momentary 'push button' operation

In Momentary mode, DXR relay is activated for 300ms.

In Latched mode, DXR relay once activated remains activated until reset by DXT.

Two inputs are provided on the DXT transmitter, which must be grounded for at least 30us.

Response time from grounding input to relay activation is about 150ms.

Grounding SET input, sends a coded datastream, which commands DXR to Latch Relay output if Latch

Mode is selected.

Grounding RST input, sends a coded datastream, which resets the DXR Relay back to its deactivated

state.

Also, for the duration of the RST transmission, the DXR Relay is activated when Momentary Mode is

selected. The minimum duration of a Momentary Relay activation is 300ms.

Programming the address

These units employ a sub-set of the programming commands used by standard CTX2/CRX2 modules.

Address is set with the command AVALUE

As the PGM pin is dedicated to serial communication only, the ‘ENABLESERIALMODE’ command

string is NOT required.

PGM input is a 2400 baud, 1 start bit, 8 data bits, 1 or 2 stop bits, no parity at true RS232 format

(inverted UART).

Commands

Function

AVALUE bbbbb

set value for unit address (Default 00000 )

<cr>

Enter Key / Carriage Return to process entry (0x0D)

/

clear all buffers

bbbbb = address (up to 65535, in decimal)

To successfully program the unit it must be in active state

A receiver board must simply be powered

A transmitter board must be powered, with BOTH inputs grounded

(in this state it will listen to the serial pin, but will not transmit)

Each command sequence must end with a carriage return (ascii 13)