3.4. POWER SUPPLY CONNECTION
The power supply to the ADA-7240 converter should be DC (regulated) from 10 V= to 30V=. Nominal power is typically 2W, e.g. ZS-
12/250 or DR-15-24. Power cable from DC power supplies to device must not be longer than 3m.
Observe the polarity, connect positive (+) of DC power supplies to V+ and negative (-) end to V- screw terminal block. ADA-7240 has
the protection from opposite connection power supply. If after power, on the front panel is not lit green LED PWR, check the power
connection (polarity).
4. CONFIGURATION
The operating mode of the ADA-7240 converter is set by the use 6-position SW1 switch. This switch is located near the Fibre-Optic
connectors (see Fig.1). To set the SW1 should remove the terminal cover and using small, flat screwdriver make correct setting.
4.1. OPERATING MODE SETTING
All available operating modes are shows in table below.
If there are any additional questions, please contact with technical support: [email protected] or on the phone: +48 41 362-12-46.
Table 1. RS422 or RS485 operating mode.
SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6
Description
Operating mode
OFF
OFF
OFF
OFF
OFF
OFF
RS-422 bus
4-wire RS422 network.
Full duplex or half duplex transmission.
ON
ON
ON
ON
ON
ON
RS-485 bus,
automatic data flow control
2-wire and 4-wire RS485 network.
Full duplex or half duplex transmission.
4.2. DEFAULT SETTING
The ADA-7240 converter is being set in RS485 mode during production as in the table below.
Table 2.
SW1-1 SW1-2 SW1-3 SW1-4 SW1-5
SW1-6
ON
ON
ON
ON
ON
ON
5. ACIVATION
The converter can be power on after properly connection according to section above.
If after connection power supply on front panel will not light green led PWR, check correctness of power supply connecting
(polarization). When data is present the LEDs Tx and Rx should blink.
5.1. DESCRIPTION OF SIGNALLING LEDS
LED
Description
PWR Signalling of Power Supply
RX
Signalling of data receiving through ADA-7240 from RS485/RS422 port
TX
Signalling of data transmitting from ADA-7240 through RS485/RS422 port
ATTENTION!
AT BAUD RATE ABOVE 38.4 KBPS THE LED'S TX, RX WILL LIGHT WEAKLY DURING DATA TRANSMISSION
5.2. TROUBLESHOOTING
Problem
Solutions
PWR LED is not light
Check polarization and parameters of connected power supply.
Rx LED lights continuously
RS485(4W) /422 network. Wrong polarization on terminals: Rx+, Rx-; change polarization.
RS485(2W) network. Wrong polarization on terminals: Tx+/A, Tx-/B; change polarization.
No transmission
Tx LED is blinking
RS485(4W) / RS422 network. Check correctness of connection to terminals Tx, Rx;
according to point 3.
RS485(2W) network. Check correctness of configuration setting according to point 4.
9
ADA-7240
