Rockwell Automation 2706-MB1 MESSAGEVIEW 421 SOFTWARE MANUAL - Manual (Page 219)

10–11 Terminal and Communication Setup
Publication 2706-817
MessageView terminal as a slave device
When a MessageView terminal is set up as a slave device, it is
considered to be a slave in a master/slave relationship. The slave
device terminal receives commands from a slaving (master) device,
but does not initiate communications itself. See Page 4–18 for a
discussion of slave devices.
Because of the architecture of the MessageView 421D Slave Device
terminal (Catalog No. 2706-M1D), an application with the
communication parameters and a blank message needs to reside in
the terminal’s memory. All MessageView 421D terminals (Catalog
No. 2706-M1D) are shipped with an application residing in memory
for this purpose.
Consult the Slave Device section of the MessageView terminal user
manual for more details.
Auxiliary Device port
The MessageView terminal configured with a daughterboard
communications card (Remote I/O) can use the RS-232 port as an
auxiliary port for communications to:
•
an ASCII Input device
•
a slave device (the MessageView terminal is a master device)
The Auxiliary port parameters are configured under the Aux. Port
tab in the Terminal Setup dialog. See the section starting on Page
10–27 to configure the auxiliary port.
Note: Since the same RS-232 port on the terminal is used for
communications with an ASCII Triggering device or a slave device,
and also with MessageBuilder programming software, the terminal
must be set to the correct port configuration before proper
communications can be established. See the discussion on Page 5–3.