DECODE PRM4 Руководство пользователя - Страница 8

Просмотреть онлайн или скачать pdf Руководство пользователя для Радиомодемы DECODE PRM4. DECODE PRM4 20 страниц. 868mhz

3 Installing the device

The PRM 4 is powered by 5 to 28 VDC or 3.3 to 12VDC in battery powered version

of the product. The standard current drain is less than 50mA with the transmitter

turned on constantly and drops to 2-3mA in the reduced power consumption mode

(excluding the RS232 consumption). The power is supplied through the detachable

screw connector with 3.5mm gap on the back plate of the device. Mind the polarity of

the power connector pins. The power connector has reverse polarity and over-voltage

protections.

The connection of a serial interface is achieved by 9-pin female connector (DB9F).

Depending on the position of the jumpers located on the circuit board, the device can

be connected with the following interfaces: RS-232C, RS-422 and RS-485. If the

jumpers are set for RS-232C, the signal layout matches the DCE side. The following

table shows the DB9F connector signal layout for different serial connections.

Pin DB9F

connector

Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011

PRM4 back plate

RS-232

signals

DCD

output

input

DTR

input

GND

DSR

output

RTS

input

CTS

output

(1)

output

(1)

RS-422

RS-485

signals

-TX

-TX/RX

-RX

GND

+RX

+TX

+TX/RX