AMS42-LAN16fx
Seite 9
4
AMS Backplane
The AMS-backplane provides 8 slots for 5B modules and the
AMS-K
plug-in cassettes (see chapter
6.2) carrying the 5B modules. If the AMS42-LAN16fx is used with the optional add-on
AMS-EXT8
(see
chapter 6.4), eight slots each are available at the front and at the back of the device.
4.1
Ground-to-Ground Resistance
Ideally, the output ground is not electrically connected with the power supply ground. If, however, a
connection to ground is necessary (e.g. to use the output switch in the 5B module), the 2-pin jumper
(see fig. above) must be closed.
In the case of electrically connected systems (e.g. PC), this jumper represents a high-resistance bridge (1k
W
) and may
generate a hum loop!
4.2
Module Pin Assignment
The pin assignment on the right shows the top view of the module
backplane (see chapter 4).
The pin assignment corresponds to the 5B modules of Analog De-
vices
®
, BURR BROWN
®
etc. However, an additional 0EX pin has
been introduced, which is particularly suitable for ungrounded shiel-
ding. This is a specific assignment of BMC Messsysteme GmbH.
This pin is not connected in modules of other manufacturers.
4.3
Fuse
The fusing of the AMS backplane (see chapter 4) is effected on the backplane with one reversible
semi-conductor fuse. In case of overload it turns off. To make the fuse work effectively again, first re-
move the cause for overload before disconnecting the power supply of the AMS42-LAN16fx.
4.4
Connection for AMS Cassettes
The cassettes are connected to the AMS backplane (see chapter 4) via 7-way pin
connectors leading the input signals connected at the cassette panel to the backplane.
The assignment of the 7-way female connector on the board is illustrated in the figure
on the right-hand side.
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