●
External power supply 10 - 30 VDC stable min. 3W,
●
1kV= or 3kV= galvanic isolation between RS485/RS422 interface and power supply,
●
Connection RS485/RS422 network and power supply via screw terminal block,
●
Connection Fiber Optic network via fibres optic connectors type: ST® *(850nm), SC(850nm), SMA(650nm),
●
Protection against power supply reverse connection,
●
Implemented overvoltage protection on RS422/485 network,
●
DIN 43880 standard - mounting in typical electro-installation unit,
●
Rail mounting according to DIN35 / TS35 standard,
●
Dimensions of casing contour (W x H x D) 71mm x 90mm x 58mm,
2.2. DESCRIPTION
Multidrop Fiber Optic Converter ADA-7240 is used for creation of fiber optic bus, for connection of RS485/422 interface devices quite
distant from each other eg. Computers, controllers etc. Conversion between fiber optic RS485/422 is without interfering with the data
format. The use of fibre-optic provides complete isolation between connected devices and resistance to interference on the
transmission bus. Fiber optic connection is made by the use of two fibres. ADA-7240 can be use also for extend the fiber optic bus for
next part 2500m because the converter also complies functions of fiber optic repeater.
ADA-7240 is equipped with screw terminal block for connection of RS485/422 and power connections. It supports baud rates up to
2Mbps on 2-wire or 4-wire RS-485 bus via one or two pairs of twisted pair, connected to the screw terminals block. The device uses to
operate lines RX +, RX-, TX +, TX-.To RS485 bus built on the ADA-7240 can be connected 32 devices operating in half duplex mode
or full duplex mode and to RS422 bus two devices operating in half duplex mode. Overvoltage protection was made on base safety
diodes and fuses on each RS485/RS422 lines.
Fig. 1. View of ADA-7240.
4
ADA-7240
1
5
m
m
Power Supply
10 - 30 VDC
RS-485 4-WIRE
or RS-422
9
0
m
m
71mm
T
X
1
R
X
2
R
X
1
T
X
2
1
7
m
m
N
C
T
x
+
/
A
T
x
-
/
B
R
x
+
R
x
-
N
C
N
C
N
C
RS-485
2-WIRE
ADA-7240
PWR
TX
RX
FIBER OPTIC REPEATER to RS-485/RS-422
RS485/RS422
(SW1)
58mm
V
-
V
+
10 – 30
VDC
