Allen Bradley DL20 Dataliner with Input Converter. 2706-B21J31 Ser. F with 2706-NG1.

The addressable master feature allows you to connect 100 DL20s to a single RS-422 port on the controller. Each display has its own unique address. The controller can command any one, or all of the DL20s on the network to display a message. Slave Mode Master The DL20 can operate as a slave device. In run mode, special commands place the DL20 into slave mode. As a slave device, the DL20 does not respond to message triggers, but displays strings of ASCII text sent by the controller. Programmable Controller Interface The host controller can trigger a message display using either: • Parallel Data Lines The DL20 has ten data lines and two strobe lines which accept DC input voltages from 5 to 30 volts. The optional Parallel Input Converters (Catalog No. 2706-NG1, -NG2) allow the DL20 to accept 120VAC input signals. The logic program in the controller turns some lines ON and some OFF. The DL20 recognizes this combination as a message number. ! ATTENTION: Parallel Input Converters (Catalog No. 2706-NG1, -NG2) cannot accept 220/240VAC. If 220/240VAC is applied to the Parallel Input Converter, damage to the input converter will occur. • RS-422 / RS-232 Serial Ports Both the RS-232 and RS-422 ports accept serial commands and variable message data. The serial commands are formatted and recognized identically to the parallel commands. The only difference between the two is the wiring of the signals and the host controller program.