CEL-MAR ADA-7040, User Manual

Page: 6 / 12

3.2.2. CONNECTION TO 4-WIRE RS485 NETWORK
Fig. 4. Example connection of RS485(4W) device to ADA-7040
3.2.3. CONNECTION TO 2-WIRE RS485 NETWORK
Most of RS485 devices use 2-wire RS485 network for data transmission, example of connection ADA-7040 to 2-wire RS485 network is
shown below.
Fig. 5. Example connection of RS485(2W) device to ADA-7040
3.2.4. LINE TERMINATION Rt ON RS485/RS422 BUS.
The application of Line Termination (terminator) Rt = 120
W
will reduce electrical reflection in data line at high baud rate. It is not
needed below 9600Bd. Should be used the Line Termination resistor if the distance is over 1000m @ 9600Bd or 700m @ 19200Bd
transmission. Example connection of Rt are shown on Fig. 3, 4 & 5. Two resistors Rt =120
W
, are supplied with ADA-7040 converter,
free of charge.
3.3. CONNECTION FIBRE-OPTIC BUS
The multimode Fibre-Optic with connectors type: ST® , SC or SMA, connect into their corresponding converter's connectors type: ST®
, SC or SMA like on the Fig. 6. Connecting the fiber optic cables should be cautious and careful not to damage them or dirty. If it is
necessary to lay the cable at an angle, must be created the appropriate bends
6
ADA-7040
FO
connector
Multimode the
optical fibers,
types:
50/125um,
62,5/125 um,
100/140um,
200umHCS,
plastic POF/1mm,
RS485(4W) interface
devices
TX
RX
Rt
RX+
RX-
GND
TX+ / A
TX- / B
Vss+
Vss-
V -
V +
RS485(4W)
connector
Power Supply
ADA-7040
Rt
Multimode the
optical fibers,
types:
50/125um,
62,5/125 um,
100/140um,
200umHCS,
plastic POF/1mm,
RS485(2W) interface
devices
RX+
RX-
GND
TX+ / A
TX- / B
Vss+
Vss-
V -
V +
RS485(2W)
connector
Power Supply
ADA-7040
Rt
TX
RX
FO
connector