TW-100D, TW-100DB, TW-100Dm, TW-100DBm, TW-115B
- Technical Documentation
25.9.2007 © E.L.B. Ex-Geräte Bachmann GmbH Page 5
instructions. In this case switch scanner and keyboard in parallel over
an external keyboard wedge (KS-20).
•
RS-232 and RS-485 data may only be sent from the Ex-protected base
station to the PC, not in the opposite direction. Transmission of RS-XXX
data from the PC to the terminals of the Ex approved base station are
not allowed and may additionally destroy components.
•
Mixing-up of signal types (RS-232 into PS/2 terminals e.g.) or terminals
may destroy internal components. Repair is hardly possible because of
the moulding.
•
TW-1... probably contains the only PS/2 wedge, which works even with
mice. Please keep in mind, that swapping different devices connected
to the internal TW-1... wedge causes the same PC reactions like
swapping by hand. Some hints:
o
Let your PC boot completely before any action.
o
After switching on the PC only one side (selectable) of the
keyboard wedge is connected to the PC for 30 seconds. The PC
boots with the devices of this side. Mouse and keyboard of the
other side are electronically disconnected meanwhile. They will
be connected automatically afterwards and introduce themselves
to the PC.
o
The PC boots with the devices connected to the side of TW-1...,
which you selected for this purpose. If devices are missing there
the PC switches all PS/2 lines dead.
o
The keyboard wedge switches over automatically, which you will
not notice while swapping keyboards. Swapping mice may last
up to 3 seconds, depending on the PC and the mice. Rapid
mouse actions do not accelerate anything.
o
Some PCs answer to a new mouse like clicking the right mouse
button: a window is opened. Please press "Esc" or "Alt" or click
on an empty area on the screen with the left mouse button to
close the window.
o
Frequent or rapid swapping does not affect TW-1... at all - but
maybe your PC application. (If data strings are interrupted e.g.)
Please keep in mind, that vibrations may move a mouse in
industrial sites.
•
Tip: Intrinsically safe circuits are electrically separated from other
circuits up to a peak value of 375 V. Thus intrinsically safe devices
connected there need not be grounded.