3.5. POWER SUPPLY CONNECTION
The power supply to the ADA-1021 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- terminal. ADA-1021 has the protection
from opposite connection power supply. If after powering on the front panel is not lit green LED PWR, check the correctness of power
connection (polarity).
4. ACTIVATION
Converter can be powered after proper connection according to steps above. If the connection was made properly green LED PWR on
front panel of converter should lit, if not check polarization of power connection. If the red LED RX is lit check correctness of
connection transmitting line of Current Loop Device. The lighting of RX LED indicates no current flow through the optocoupler in the
receiver's circuit.
During proper data transmission through converter the LEDs Tx and Rx should blink.
4.1. LEDS DESCRIPTION
LED
Description
PWR Signalization of power supply
RX
Signalization of data receiving by ADA-1021 from Current Loop.
TX
Signalization of data transmission from ADA-1021 converter through Current Loop
ATTENTION!
AT BAUD RATE ABOVE 38.4 KBPS THE LED'S TX, RX WILL LIT WEAKLY DURING DATA TRANSMISSION
5. RS232 INTERFACE – PIN DESCRIPTION OF DSUB-9F-DCE SOCKET
Pin
Signal
Description
ADA-1021
1 (DCD)
Level of receiver signal
Connected with DSR
2 (TxD)
Data transmission from ADA-1021
Transmitter
3 (RxD)
Data receiving from ADA-1021
Receiver
4 (DSR)
Device readiness of data receiving/ transmission
Connected with DTR
5 (SG)
Signal ground
GND
6 (DTR)
ADA-1021 readiness of data receiving/ transmission
Connected with DSR
7 (CTS)
The device confirms acceptance of the signal RTS from ADA-1021
Connected with RTS
8 (RTS)
ADA-1021 notify to the device readiness receiving data
Connected with CTS
9 (RI)
Call rate
Not connected
6. VERSIONS
ADA-1021 -
-
-
-
Order example:
Product symbol:
ADA-1021-1-2-1-2
1 –
standard electronics version,
2 –
current loop voltage12VDC,
1 –
current loop current 0-20mA,
2 –
galvanic isolation1kV=,
Electronics version:
Standard
1
Current Loop Voltage:
24VDC
1
12VDC (standard)
2
Current Loop Current:
0 – 20 mA (standard)
1
0 – 30 mA
2
0 – 45 mA
3
Galvanic isolation:
1kV= 3-way
2
3kV= 3-way
3
10
ADA-1021
