Cognex DataMan 150 QL, Справочное руководство

Страница: 43 / 57

Multi-port Connections
You can connect multiple DataMan 150 readers to a single PC (or other device equipped with a serial port) using a
multi-port connection.
A multi-port connection creates a daisy-chain of readers. Each reader receives serial data from the previous reader and
transmits it to the next reader. When a reader transmits data, it is passed through each of the readers in the chain
between it and the PC.
You must construct your own cable that meets the requirements of your system configuration.
The cable must provide a DB-15 connector for each DataMan 150 and a DB-9 connector for the PC serial port. Each DB-
15 connector must provide Tx Data, Rx Data, Trigger (Input 0), ground, and DC power. The Tx Data and Rx Data pins on
adjacent connectors must be connected to provide the multi-port connection.
The following diagram shows how to create a multi-port cable for a 3-reader system. In the example, all the readers
share a common trigger. It is also possible to wire individual triggers for each reader.
43