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Multiport Switches are controlled manually from the front panel of the Master Controller module or a remote host computer via an RS422 port on the rear of the Master Controller module.
 The Master Controller module has various controls and indicators to select a switch and then open or close one or more data paths. The controls are protected from unauthorized access by a removable key-lock switch. When the key-lock switch is in the MANUAL position all front panel controls are active; in REMOTE, only the remote host device can control the switches by sending ASCII command strings to the unit.
The Master Controller module is supported by the Slave Controller module. The Slave extends the control of the Master into 14 additional enclosures. Together, the Master and Slaves control a total of 48 1x2 switches.
The Master Controller Module, from PURVIS Systems, has a front panel with controls and indicators, and a rear panel with data, control and power connectors. Internal to the module is a printed circuit board and two power supplies. The module slides into the first slot of the Multiport Switch Enclosure.
The front panel has membrane style buttons that are active when the key lock switch is placed in the Manual position. These buttons Open and Close a single position on a single switch; Open or Close a single position on all switches or Open and Close all positions on all switches. There is a thumbwheel switch that is used to address specific switches and an LED readout that displays the location of a switch or the remote host communication port settings. When the key switch is in the Manual position, switch positions are opened and closed using the front panel controls.
Each enclosure will accommodate one control module and five switch modules, of any type. Internal to the enclosure is a backplane or bus for the modules to receive DC power, control and status signals.
Access to switch modules is protected by a hinged door. A write-on decal, located on the inside, allows the customer to identify each module.
The rear panel has a DB25 connector for a remote host connection; a DB37 connector to connect to Slave Control modules; an input power connector with ON/OFF switch and a unit address switch. The Master is powered by 115 VAC 60Hz or 220 VAC 50Hz.
The Master Controller module can interface to a remote host device such as a computer having an RS422 communication port. An RS422 to RS232 converter can be used if the remote does not have RS422 capability. The remote device sends ASCII command strings to the Master to control switch positions and receive status.
The Master interfaces with the Slave Controller module to control up to 48 switches.
When planning your Enclosure configuration, include an AC Power Input cable P/N 220-000100-327 and if you intend to control your system with a remote device, RS232 cable P/N 220-000400-327, RS232/422 Converter P/N 220-000200-409 and the RS422 Converter cable P/N 220-000500-327.
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