Meinberg TCR511PEX - Manual (Page 8)

8
Features TCR511PEX
The board TCR511PEX is designed as a „low profile“ board for computers with PCI
Express interface. The data transfer to the computer is done by using a single PCI
Express Lane (x1 board).
The IRIG receiver is equipped with a standard height bracket. For installation in a „low
profile“ computer, an adequate bracket can be mounted that is included in delivery. The
I/O signals provided by a D-Sub connector are only available when using an additional
bracket (not included) in this case.
TCR511PEX serves to receive and decode modulated (AM) and unmodulated (DC
Level Shift) IRIG and AFNOR time codes. AM-codes are transmitted by modulating the
amplitude of a sine wave carrier, unmodulated codes by variation of the width of pulses.
Automatic gain control within the receive circuit for unmodulated codes allows
decoding of IRIG signals with a carrier amplitude of 600 mVpp to 8 Vpp. The input
stage is elecctically insulated and has an impedance of 50
Ω, it is accessible via the BNC-
connector in the bracket of TCR511PEX
Unmodulated time codes must be connected to the D-Sub-plug of the module. An
onboard photocoupler insulates the internal receive circuit. In delivery state of
TCR511PEX the contacts of the D-Sub-plug are not connected to the photocoupler.
Two DIP-switches must be set to the ‘ON’ position for making this connection.
The board TCR511PEX provides a configurable serial interface (RS-232), a pulse per
second (PPS) with TTL or RS-232 level and a pulse per minute (PPM) with TTL level.
Like the photocoupler, these signals are only connected to the D-Sub-plug after setting
DIP-switches into the ‘ON’ position.
Software running on the computer can read out information regarding date, time and
status of the IRIG receiver. Access to the board is made via writing to/reading from I/O
ports. It is possible but not necessary to let the board generate periodic hardware
interrupts on the computer bus.