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Add-On
3.3 Add-On ’ASIO-422’
3.3.1 General
The RS-422 add-on, available as an option, has to be inserted into
the jumperfields BR43 to BR50, BR53 to BR56 and BR5 to BR8. If the
add-on shall be inserted, the components of the TTY interfaces must
not be inserted, because this area is required for the add-on.
The add-on offers a maximum of 12 interfaces, electrically isolated
from the VMEbus and from the local components, with a simultaneous
possibility of using 4 RS-232 interfaces in the ’XON/XOFF-only’
operation (channel 13 to 16 - on the base board). Partial insertion
of 4 (channel 9 to 12) or 8 (channel 5 to 12) RS-422 interfaces,
respectively, is possible.
The electrical isolation of the RS-422 interfaces ensues by means of
a DC/DC converter on the add-on. The feeding of the power supply for
the add-on (including
DC/DC converter) can ensue from the ASIO16
(VMEbus supply) or externally via the ASIO16 P2 connector.
When using the ASIO P2 adaptor it must be taken care that the add-on
reference potential (GND) has to be fed via the adaptor jumpers BR22
and BR23 to the 14 pole connector plug. These jumpers must also be
inserted if no external power supply is fed to the board!
3.3.2 View of the ASIO422-Add-Ons
Fig. 3.3.1:
Top Overlay Placement of the RS-422 Add-Ons with Marking
of the Jumpers
VME-ASIO16 Rev. 1.7
53
Summary of Contents for VME - ASIO16
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