Rockwell Automation 2706-F11J_F11JC_F21J_F21JC DL50 INSTALLATION MANUAL - Manual (Page 21)

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).
Selecting Protocol
Selecting Character Height