. CAD-232-A2 converter brings a new flexibility to A-bus

A-bus network:

High speed, high performance A-bus is used for connecting PLC's (CyBro-2 and Integra-BM RC) and PC to network. PLC's and PC are connected to network through CAD-232-A2, which also provide galvanic isolation.
A-bus specifications:
-    Port settings: 19200bps, 8 data, 1 stop, no parity, no handshaking
-    Signal level: 5V differential
-    Max line length: 1000m
-    Max devices: 32
-    Wire: 3 conductors, shielded
-    Shield: connected to system ground at one point only
-    Termination at CAD-232-A2 connected to first and last device on
   network termination switch ON

A-bus communication:

Every communication cycle consists of request (send by master) and response (slave). During program transfer, monitor and debug master is PC. In A-bus network master is one of PLC's.
When network is started, master send command SEND_PERM to first network slave.
Slave responds by sending a transmit socket. All PLC's may receive socket, but actually receives only ones which have received socket addressed from sender. When command is completed, master asks second slave and so on.
Other possible answer to master command is to temporary take over communication and sends any A-bus command. In that case, master waits for a second slave to answer, and then continues, asking next slave.

CAD-232-A2:

Communication converter CAD-232-A2 allows PLC’s (CYBRO-2 or INTEGRA-BM RC) to work in A-bus network. Its main task is converting RS 232 to A-bus (RS 485) signals. CAD-232-A2 has two RS232 channels, allowing both PLC and PC to connect to A-bus network at the same time. It is also possible to use one converter for connect two PLC's on A-bus network. CAD-232-A2 is powered directly from IEX-2 bus, so there is no need to use external power supply. For better monitoring of a communication flow there are 7 LED's (RS232-1 Rx & Tx, RS232-2 Rx & Tx, RS485 Rx & Tx, and Power). That is particularly usable in case of maintenance or service. Converter provides strong protection against static discharge.

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