Meinberg TCR511PCI, Руководство пользователя

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5.5 Photocoupler input Page 11
The setting 5 k
Ω
may be necessary if the generator has a high output impedance (see specications of manufac-
turer). The driver software shows a bar chart for evaluation of the signal level at the receiver input. The following
detail of the placeplan of TCR511PCI shows the possible jumper setting with the related input impedance:
No jumper set: 5K Ohm
Jumper in this Position: 50 Ohm
Jumper in this Position: 600 Ohm
5.5 Photocoupler input
Pulse width modulated (DC Level Shift) codes are insulated by an onboard photocoupler. The connection scheme
is shown below:
R = 220 Ohm
DIP 2
DIP 1
Pin 6
DSUB
Pin 7
DSUB
+ DCLS in
- DCLS in
The internal series resistance allows direct connection of input signals with a maximum high level of +12 V (TTL
or RS-422 for example). If signals with a higher amplitude are used, an additional external series resistance must
be applied for not exceeding the limit of the forward current of the imput diode (50 mA). The forward current
should not be limited to a value of less than 10 mA to ensure save switching of the photocoupler.
5.6 Configuration of TCR511PCI
The selection of the IRIG code, conguration of the serial interface and a possible oset of the received IRIG time
to UTC must be set up by the monitor software via the PCIExpress bus. In contrast to AFNOR NFS 87-500 the
IRIG telegram containes only the day of year (1...366) instead of a complete date. To ensure correct function
of TCR511PCI, the date stored in the realtime clock of the board must be set when using IRIG codes therefore.
This setting can be done by a terminal software also.
If the time zone of the received IRIG code is not UTC,
the local oset to UTC must be congured to ensure
correct function of the driver software. If the local time
zone is MEZ for example, the board must be set to a
local oset of `+60min' (MEZ = UTC + 1 h).
The serial interface COM0 can be congured to send a time telegram with reference to UTC or to the received
local IRIG time.
TCR511PCI Date: 2009-06-24 11