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PCI511

DCF77 computer clock (PCI Bus).

Key features

PCI LOCAL BUS interface,
3.3V or 5V, 33MHz or 66MHz, PCI-X compatible
Plug and play
Pulses per second and per minute
Periodic interrupts
RS232 interface
Receiver status LEDs
Buffered hardware clock
Configurable time zone
Driver software for all popular operating systems

Detailed description

The board PCI511 has been designed for the reception of the DCF77 signal, the transfer of the time information to a computer with PCI (PCI-X) bus interface and the translation of the received codes into a serial telegram.

The drivers package for Windows contains a time adjustment service which runs in the background and adjusts the Windows system time continuously and smoothly. A monitor program is also included which lets the user check the status of the device and the time adjustment service, and can be used to modify configurable parameters.

The driver package for Linux contains a kernel driver which allows the board to be used as a reference time source for the NTP daemon which is shipped with most Linux distributions. This also turns the computer into a NTP time server which can also provide accurate time to other NTP clients on the network. Some command line tools can be used to setup configurable parameters and monitor the status of the board.

Additional drivers packages are available for DOS, Novell NetWare, and OS/2. At the bottom of this page there's a link to the download area.

The device's serial port can be used to update the card's firmware. Additionally it can be connected to the serial port of a computer to use the card as reference time source under operating systems where a serial time string is supported, e.g. by NTP, but no kernel device driver is available.

Technical data

Type of receiver:	Narrow band DCF77 quadrature receiver with automatic gain control, bandwidth: approx. 20Hz
Status info:	RF Signal: Indicated by LED, antenna alignment enhanced by utility program Free running: Indicated by LED and utility program without RF signal the clock runs on quartz basis with an accuracy of ±1·10-6 (after 24 hours of synchronous operation) Modulation: Indicated by LED and utility program
Reception Control:	Multiple check of received time telegram Plausibility control by using two complete time telegrams
Scope of supply:	Scope of supply includes an active ferrite antenna AI01 and 5m of RG174 coaxial cable with BNC connectors. Optional: AW02 with RG58 and patch cord, other length of cable
Pulse outputs:	Pulses per second (RS232/TTL level) and per minute (TTL level), pulse duration: 100 msec, active high
Interface:	PCI LOCAL BUS (PCI), PCI-X compatible
Data format PC interface:	Binary, byte serial
Data format of interfaces:	Baud rate: 300, 600, 1200, 2400, 4800, 9600 baud Framing: 7E2, 8N1, 8E1, 8N2 Output string: 32 ASCII characters with date, time and status information
Statusbyte:	Information about free running mode, daylight savings time and DST pre-switch announcement, synchronization since last reset, GMT/UTC time and validity of the hardware clock data
Electrical connectors:	9 pin sub D male connector BNC female connector
Computer interface:	33MHz- or 66MHz-PCI BUS (PCI-X) 32 Bit/3.3V or 5V card slot
Backup battery type:	In case of supply voltage failure the on-board RTC keeps the time based on XTAL for more than 150 hours (buffer capacitor) Optional: lithium backup battery (life time: 10 years)
Board type:	PCI card short
Ambient temperature:	0 ... 50°C / 32 ... 122°F
Humidity:	Max. 85%

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