DECODE PRM4 Manuale d'uso - Pagina 8

Sfoglia online o scarica il pdf Manuale d'uso per Modem radio DECODE PRM4. DECODE PRM4 20. 868mhz

Stampa la pagina

3 Installing the device

3.1 Power supply

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.

3.2 Serial connector

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
1
2
3
4
5
6
7
8
9
Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011
PRM4 back plate
RS-232
signals
DCD
output
RD
output
TD
input
DTR
input
GND
-
DSR
output
RTS
input
CTS
output
RI
(1)
output
(1)
RS-422
RS-485
signals
signals
-TX
-TX/RX
-RX
GND
GND
+RX
+TX
+TX/RX
8