Meinberg TCR511PCI, Руководство пользователя

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Page 10 5 Putting into operation
5 Putting into operation
To achieve correct operation of the board, the following points must be observed.
5.1 Installing the TCR511PCI in your Computer
Every PCI-Express board is a plug & play board. After power-up, the computer's BIOS assigns resources like I/O
ports and interrupt lines to the board, the user does not need to take care of the assignments. The programs
shipped with the board retrieve the settings from the BIOS. The computer has to be turned o and its case must
be opened. The board can be installed in any PCI-Express slot not used yet. The rear plane must be removed
before the board can be plugged in carefully. The computers case should be closed again before restarting the
computer.
5.2 Power supply
All power supplies needed by TCR511PEX are delivered by the PCI-(Express) bus.
5.3 Input signals
Amplitude modulated IRIG-A/B or AFNOR codes must be connected to the BNC-jack in the bracket of TCR511PEX.
A shielded or twistet pair cable should be used.
Pulse width modulated (DC Level Shift) signals are applied by using the D-Sub-plug. Two DIP-switches must be
set to the "ON" position for connecting the contacts of the D-Sub with the onboard photocoupler.
The IRIG code used must be congured with the monitor software.
The board TCR511PCI can't be used to decode ampli-
tude modulated and DC Level Shift signals simultane-
ously. Depending on the selected code, only the signal
at the BNC-jack or the D-Sub connector is decoded.
5.4 Input impedance
The IRIG-specication does not dene values for the output impedance of generators or the input impedance
of receivers. This fact led to incompatibility of some modules, because the manufacturers could choose the
impedances freely. For example: if the output impedance of the generator is high and the input impedance of
the receiver low, the signal level at the receiver input might be too low for correct decoding. Therefore the board
TCR511PCI provides a jumper to select the impedance (50O
Ω
, 600
Ω
or 5 k
Ω
) of the input for modulated codes
to comply with the requirements of several systems. Meinberg IRIG-generators have an output impedance of 50
Ω
, to build a matched transmission system when using a coaxial cable. If such a generator is used to synchronize
TCR511PCI, the input impedance has to be set to 50
Ω
accordingly (default on delivery).
In addition to the telegram, the AFNOR-code denes the input/output impedances also. If TCR511PCI is
synchronized by this code, an input impedance 600
Ω
of must be set.
10 Date: 2009-06-24 TCR511PCI