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Theory of Operation
VX1410A & VX1420A IntelliFrame Mainframe Instruction Manual
6–3
Temperature Sense Board. The Temperature Sense board (A2) monitors the
exhaust air temperatures for each slot within the mainframe. The Temperature
Sense Board connects to the backplane through the ribbon cable at J16.
Enhanced Monitor Board. Your IntelliFrame Mainframe comes standard with the
Enhanced Monitor board. The Front Panel Display board is standard on the
VX1420A and is Option 1M on the VX1410A. The Enhanced Monitor board
(A7) collects the monitoring information from the power supply, fans, and
Temperature Sense board and passes it to the 25-pin D connector. The Monitor
board connects directly to the backplane at 0J3, 0P1 and 0P2. The Enhanced
Monitor includes a nine-pin RS-232 port to connect to an external host. Address
switches near the bottom rear of the board allow you to select the VXIbus
address. A green READY indicator and amber ACCESSED indicator located at
the bottom of the board indicate the operating status of the mainframe.
VX1410A-The two fans connect to the Monitor board at J7 (Fan2) and J8
(Fan1). The Fan Speed switch (S3) selects either variable fan speed (VAR) or full
speed (FULL).
VX1420A-The blower connects to the Monitor board at J8 (Fan2). The Fan
Speed switch (S3) lets you select either variable fan speed (VAR) or full speed
(FULL).
Table 3–1 on page 3–2 shows the pinouts of the 25-pin D connector.
The Enhanced Monitor board also has circuitry to allow you to communicate
with the mainframe with SCPI commands. These commands are detailed in the
Reference section of this manual.
An Auxiliary Power input connector is available to connect 5 volts from an
outside source to power the communication circuitry in the event of power
failure of the mainframe.
Option 1M provides your VX1410A mainframe with a Front Panel Display
board. You may upgrade your mainframe with a front panel display by ordering
the VXF1M field upgrade kit. This display should be standard on your
VX1420A mainframe.
Display Panel. The Front Panel Display board (A6) has a 20-character alphanu-
meric display that displays the system messages on the front panel. Scroll keys
allow you to scroll through the messages one at a time. The Front Panel Display
board connects to the backplane through the ribbon cable at J18.
Mainframe with Option 1M