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INTRODUCTION
The 4 Position Code Activated Switch,
Model 4P-MAS
allows one master RS-232 port to be selectively
switched to any of four RS-232 devices, designated A through D. Typically, the 4P-MAS is used to
allow one modem to access the configuration or out-of-band management ports of four remote devices
(see Figure 1A). Three modes of operation allow the selection of the port to be connected.
Menu Selection
The 4P-MAS selects the port to connect to the master based on menu selections.
The menu system allows convenient naming of each port, and setup of all 4P-MAS
parameters.
Lead Control
This option allows any of the four ports can access the master port by raising its
Request To Send (RTS) or Data Terminal Ready (DTR) control lead. This capability is
in addition to the menu selection as described above.
Manual Control
A front panel push-button allows local control of port selection.
There are four LED's on the front of the 4P-MAS to indicate which port is connected to the master.
There are four DB25S female connectors on the rear panel for the switched ports, (designated A-D) and
one DB25P male connector for the Master Port. The 4P-MAS also supports an internal modem option.
Dataprobe supplies modems from 2400 bps to 33.6 Kbps. This modem can be factory or field installed.
Figure 1 illustrates a typical system using the 4P-MAS.
Internal or
External
Modem
Master
Port
A
B
C
D
To DCE
To 4 DTEs
REF: CAS\4P-MAS_V980326R.DOC
4 Position Menu Activated Switch
Model 4P-MAS
