Black Box ACS201A Manual de usuario descargar pdf (Pagina 7)

Integration Note

Solution #3

The final solution presented here consists of completely bypassing the converter. By wiring the

TxD- and RxD- and ground wires from the RS-422 side to the TxD, RxD and ground from the RS-

232 side. To implement this solution, a different cable must be used on the DVT side. Instead of

using a RJ-11 cable which carries only four conductors, a RJ-12 cable (same plug connectors but

carries 6 conductors) must be used so that a common ground exists. A simple terminal block can

be used for this approach. For the wiring details see Figure 8Figure .

PIn No. Signal

1 5V

Tx+

Rx-

Rx+

Tx-

GND

ABB Serial Port

Connector

RJ-12 cable

(six conductors)

RJ-12 from DVT

Pin No. Signal

RxD

TxD

DTR

0 V

DSR

RTS N

CTS N

Figure 8: Direct Wiring w/o Converter

This solution is only applicable over very short distances (a few feet.) The RS-422/485 standard

uses differential voltages to transmit data (allowing for greater distances), while the RS-232

standard uses absolute voltages. By performing the direct wiring explained above, the absolute

signal levels produced in the RS-422/485 side and seen by the RS-232 side become close to the

±3V limit as the distance of the wires increases. In addition, this solution would make the system

more vulnerable to noise. However, it has the advantage of not having to use a converter or an

extra power line in the installation.

Software-Example

One of the solutions described in the hardware section should be implemented for the data

exchange connection and the connections should follow the diagram in Figure 2.

The best way to illustrate the necessary software steps is to go through a very simple example. A

basic and common operation is to obtain the position of an object from the SmartImage sensor

and feed it into a variable in the ABB controller. For the sake of simplicity this example will show

how to send a single floating point number from the DVT system into the ABB controller (without

regard for coordinate transformations). The steps necessary to accomplish this are:

1 2 3 4 5 6 7 8 9 10

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Black Box ACS201A Manual de usuario Pagina 7

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