INSTALLATION MANUAL User Manual

Chapter 3

Configuring the DL50

3–4

The DL50 communicates with a host device using strings of ASCII

characters. The DL50 can communicate using one of two protocols:

• Simplex. When simplex protocol is selected, the DL50 does not provide

any response to a master device. The master sends out packets of data,

each containing message text and other information. The DL50 uses this

information to display messages.

• Duplex. When duplex protocol is selected, the DL50 responds to

messages with handshaking and checksum bytes.

Switch S2-1 selects the protocol:

Protocol Selection Switch

Protocol

Switch Number S2-1

Duplex ON

Simplex OFF

Note: Select Simplex when operating the DL50 as a slave to DL20 or DL40

message displays.

When using Simplex Protocol, switches S2-2 and S2-3 determine character

height as shown below.

Character Height Switches

Character Height

Switch Number S2-2 Switch Number S2-3

2.1 inch (53.4 mm) OFF OFF

4.8 inch (114 mm) OFF ON

Auto-Select ON OFF

Reserved ON ON

If you are using a 4 line DL20 or DL40 as a master, the Auto-Select function

allows the DL50 to select the character height based upon the line number as

shown in Table 3.A.

When using duplex protocol, message attributes such as character height are

selected using slave mode commands (refer to Chapter 5).

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