Rockwell Automation 2706-M1 MESSAGEVIEW 421 HARDWARE MANUAL - Manual (Page 127)

Glossary G–7
Publication 2706-816 – November 1996
RS-232 – A serial link for transmitting data to and from the RS-232
port of a MessageView terminal. All terminals have an RS-232 port.
Communication with a personal computer requires a DF1
connection, whose parameters are set up in the terminal’s Firmware.
Communication with any other device requires that the RS-232 port
Parameters are set up in the Application. Communication with a
Slave Device requires a RS-232/Simplex connection.
Remote I/O – A serial link for transmitting data to and from a PLC
or SLC processor/scanner and the Remote I/O port of a
MessageView terminal. Some terminals do not have a Remote I/O
port. Remote I/O supports Block Transfer of data that is moved
using block transfer ladder instructions. Also referred to as RIO.
S –
Simulate Feature – This feature allows the MessageView terminal
to run an Application without a controlling device. Messages are
triggered and displayed, but although there is no input from the
Controller the terminal does not display any “No response”
messages.
Slave Device – A device that receives and displays messages from a
Master Device, but does not initiate communication. Slave Devices
include the MessageView 421D Slave Device terminal (Catalog
2706-M1D) and several of the Allen-Bradley Dataliner family.
Slaving – A system in which a Master Device controls one or more
Slave Devices remotely. A MessageView terminal with a
daughterboard and firmware that supports Slave Port can act as a
master device for up to 127 Slave Devices.
SLC – Allen-Bradley trademarked name for Small Logic
Controller.
Startup Message – The message displayed when the MessageView
terminal powers up.
U –
Upload – The process of transferring an Application or a HE Stack
file from a MessageView terminal to a computer.