Fig. 2. ETHERNET & power supplies connectors
2.3. ETHERNET NETWORK COMMUNICATION
2.3.1. TCP/UDP PORTS MODE COMMUNICATION
Communication in TCP/UDP ports mode enable for application (SCADA, MMI etc) data transferring to converter serial port via
Ethernet network in use TCP/UDP ports by using the services of client and TCP/UDP server.
2.3.2. VIRTUAL SERIAL PORT (REALPORT) MODE COMMUNICATION
Communication in virtual serial port mode enable for application (SCADA, MMI etc) data transferring to converter serial port via
Ethernet network by using the virtual COM port installed in operating system.
2.3.3. SERIAL BRIDGE MODE COMMUNICATION
Communication in serial bridge mode enable to data transferring via Ethernet network between serial ports of converters in point-to-
point topology or multi-point topology by using the services of client and TCP/UDP server.
2.3.4. OTHER COMMUNICATION MODES
The ADA-13020 converter can be configured in other communication types, like:
– terminal mode,
– modem emulation mode,
– console mode,
– user mode.
However, in the case of Current Loop CLO converter, it will not be able to work properly in these modes, as they relate to the full
RS232 interface.
2.4. CURRENT LOOP INTERFACE
2.4.1. CURRENT LOOP TRANSMITTER
The Current Loop transmitter at ADA-13020 is made as:
- active, on the base power source generate current (depend on converter's version) +/- 20mA or 0-20mA (TTY). The transmitter has a
short-circuit current limiting and low energy protection on TX+ and TX- lines.
- passive 0-20mA (TTY), on the base transistor, has also short circuit protection on TX+ and TX- lines.
The transmitter of Current Loop 0-20mA can work as ACTIVE or Passive, the selection is made by the TX switch on the front panel
(see Fig.1). The diagram is shown on figure below.
2.4.2. CURRENT LOOP RECEIVER
In ADA-13020 converter has been used passive RX receiver consisting of optoisolator (optical coupler) and protective elements. The
receiver circuit has RX+, RX- terminals as well as the terminal marked as RX-*. In the circuit with RX-* terminal has been used
additional resistor (1000 ohms or 560 ohms depend on the converter version) to reduce power in the case of connecting the receiver
to transmitter which has NOT short circuit current limit to 20mA.
The RX red LED on front panel of the converter is a signalization of NO current flow through optocoupler. This LED is ON when it is:
not connect transmitter to receiver, wrong connection of transmitter to receiver, broken connection of transmitter to receiver.
The diagram is shown on figure below.
6
ADA-13020
53mm
Network activity
transmitting / receiving
Connection activity
8
1
-
+
