CEL-MAR ADA-4044H, User Manual

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Fig 8. Star type connection of devices with RS422 interface to 4-wire RS485 network. Conversion of 4-wire RS485 network to
4-wire RS422 network, device separation from main 4-wire network, extending the main bus by a further segments of 1200m,
signal amplification.
3.2.4. GND TERMINALS CONNECTION
Connection of GND terminals of RS485/422 interfaces, devices connected to RS485/422 bus, should be done in the case of a
potential difference of the signals grounds on interfaces RS485 / RS422, which prevents proper data transmission.
Cannot connect to the GND terminal - cables screens, PE circuit of electrical installation, signals grounds of other devices.
3.3. LINE TERMINATION Rt.
The application of Line Termination (terminator) Rt = 120
W
(ohms) will reduce electrical reflection in data line at high baud rate. It is
not needed below 9600Bd. The Line Termination resistor should be used if the distance is over 1000m @ 9600Bd or 700m @
19200Bd transmission, the resistor can be necessary if there are problems with the transmission correctness. Example connection of
Rt are shown on Fig. 3, 4, 5, 6, 7 & 8. Resistors Rt = 120
W
, 5%, 0.25W of 6 pcs. are complete with the device.
3.4. POWER SUPPLY
The power supply to ADA-4044H, should be DC (regulated) from the scope 10 V= to 30V= and nominal power more then 2W. The
power cable from DC power supplies to the device must not be longer than 3m. Observe the polarity, connect positive (+) of DC power
supplies to V+ and negative (-) end to V- terminal. The ADA-4044H has the protection from opposite connection power supply.
If after power, on the front panel is not lit green LED PWR, check the correctness of power connection (polarity).
4. CONFIGURATION
The operating mode of the HUB ADA-4044H is set by the use 6-position SW1 switch RS485-PORTS.
The SW1 switch is located near the 5-pin screw terminal block and the RS485-PORTS switch is located on the front panel (see Fig.1)
The SW1 switch is used for changing the operating mode (RS485 or RS422) and the RS485-PORTS switch is used for changing the
ports type (4x2W – four ports 2-wire or 2x4W – two ports 4-wire)
To set the SW1, should remove the terminal cover and using small, flat screwdriver make correct setting.
11
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