●
up to 5kV= optoisolation between FO and Current Loop in the signal channels,
●
Connection Current Loop 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 Current Loop 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) 53mm x 90mm x 62mm,
2.2. DESCRIPTION
Fiber Optic ADA-7020 is a device used to connect units with Current Loop interface without interfering with the data format. The use of
fiber optics provides complete isolation between connected devices and resistance to interference on the transmission bus. The fiber
connection is implemented by a line consisting of two fibers - one fiber for the TX signal and one for RX signal.
The converter is equipped with screw terminal block for Current Loop and power connections. To Current Loop bus built on the ADA-
7020 can be connected two converters operating in full duplex or half duplex point-to-point and 15 converters operating in half duplex
mode topology multipoint.
Surge protection on each line Current Loop have been based on diodes and fuses.
This converter has internal, low energy surge protection for each Current Loop lines, however it is recommended to use the external
lightning arresters (typical protection of telephone line) for the lightning protection of lines.
Fig. 1. View of ADA-7020
2.3. CURRENT LOOP TRANSMITTER
ADA-7020 converter has active current loop transmitter, on the base power source generate c/- 20mA or 0-20mA (depend on
converter's version). The transmitter has short circuit protection on TX+ and TX- lines.
4
ADA-7020
62mm
Power Supply
10 - 30 VDC
9
0
m
m
53mm
1
0
m
m
1
7
m
m
Multimode Fiber Optic
PWR
TX
RX
ADA-7020
FIBER OPTIC to CURRENT LOOP
CONVERTER
CL
T
X
R
X
N
C
N
C
N
C
T
X
+
T
X
-
R
X
+
R
X
+
*
R
X
-
(CURRENT LOOP)
V
-
V
+
10 – 30
VDC
Current Loop
Interface
