AMS42/84-LAN
Page 6
5
AMS backplane
The AMS -backplane provides 8 slots for 5B modules and the
AMS-K-xxx
plug-in cassettes (see chapter 8.2)
carrying the 5B modules. In the AMS84-LAN, two backplanes are integrated. If the AMS42-LAN is used
with the optional add-on
AMS-EXT8
(see chapter 8.4), eight slots each are available at the front and at the
back of the device.
5.1
Ground-to-ground resistance
The ground-to-ground resistance is required when the output ground is not electrically connected with the
power supply ground. If the jumper (see fig. above) on the analog backplane is closed, the output switches of
the modules are switched through.
In the case of electrically connected systems (e.g. PC), this jumper represents a high-resistance bridge
(1k
Ω
) and may generate a hum loop!
5.2
Module pin assignment
The pin assignment on the right shows the top view of the module back-
plane (see chapter 5).
The pin assignment corresponds to the 5B modules of Analog Devices
®
,
BURR BROWN
®
etc. However, an additional 0EX pin has been intro-
duced, which is particularly suitable for ungrounded shielding. This is a
specific assignment of BMC Messsysteme GmbH. This pin is not con-
nected in modules of other manufacturers.
5.3
Fuse
The fusing of the AMS backplane is effected on the backplane with one reversible semi-conductor fuse. In
case of overload it turns of. To make the fuse work effectively again, first remove the cause for overload be-
fore disconnecting the power supply of the AMS42/84-LAN.
5.4
Connection for AMS cassettes
The cassettes are connected to the AMS backplane (see chapter 5) via 7-pole pin connec-
tors leading the input signals connected at the cassette panel to the backplane. The assign-
ment of the 7-pole female connector on the board is illustrated in the figure on the right-
hand side.