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P
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3080/V24
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A
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M
ATTON
LECTRONICS
O
NSTALLATION
ND
PERATIONS
ANUAL
124001UA
Port DCE/DTE Selection (SW9 thru SW26)
Slide switches SW9 through SW26 are used to configure DTE/DCE for each port. Slide Both
switches associated with a port to the same position. Example: If connecting a modem (DCE
Device) to the PORT, then the port should be configured as a DTE interface. Slide both
switches to the DTE position toward the interface connector. If connecting a terminal (DTE) to
the Sub-Channel, the port should be configured as a DCE. Slide both switched to the DCE
position away from the interface connector. The port is always configured opposite to the
interface that is to be connected to it . When a port is selected as a DCE, pin 9 and 10 test
voltages are provided to the interface connector if JP4 and JP5 are installed. If the port is
configured as a DTE, pins 9 and 10 are open. JP4 and JP5 control Plus Unreg and Minus
Unreg to all Sub-Channels, therefore it is not possible to have test power on one DCE without
having it on all DCE Sub-Channels.
Test Voltage Enable Pins 9 & 10 (JP4 & JP5)
Pin 9 and Pin 10 unregulated power is provided on each DB-25 connector configured as a
DCE if JP4 and JP5 are installed. Pin 9 and 10 unregulated power is not provided to any
connector configured as a DTE regardless of JP4 and JP5 installation.
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