Measurement Computing WaveBook rev.5.3 - Manual (Page 75)

The EEPROM
The EEPROM holds the calibration information needed for real-time sample correction.
Reading from and Writing to the Digital I/O Port
The digital I/O port is read and written by the Digital Signal Processor to transfer bytes of digital data.
It may be used as a simple 8-bit input port or as a 32-address byte-wide I/O port.
The high-speed EPP/ECP interface circuit connects the WaveBook and any attached printer to the PC via
standard DB-25 connectors. When the WaveBook is active, the interface holds the printer in a stable state;
and when the WaveBook is inactive, the interface connects the PC to the printer.
WaveBooks and the Ethernet, General Information
The following information applies to:
WaveBook/516E, when connected to the Ethernet
WaveBook/516A, when interfaced to the Ethernet via a WBK25 module or
interfaced to the Ethernet via a WaveBook/516E.
WaveBook/512A, when interfaced to the Ethernet via a WBK25 module or
interfaced to the Ethernet via a WaveBook/516E. However, WaveBook/512A
is 12-bit instead of 16-bit.
WaveBook/516, when interfaced to the Ethernet via a WBK25 module or
interfaced to the Ethernet via a WaveBook/516E. However, WaveBook/516
has no synchronization feature.
WaveBooks can transfer acquired data to the PC via a 10/100BaseT Ethernet connection. The Ethernet
connection allows for a continuous stream of data to be collected and stored. The WaveBooks can be
expanded up to 72 channels using 8-channel WBK expansion options. The WaveBook/516E also has 3
built-in parallel expansion ports, permitting connection of up to three additional WaveBook/516A,
WaveBook/512A, WBK40, and/or WBK41 units.
Note: When a WaveBook/516, /516A, or 512A is interfaced to the Ethernet via a WBK25 module, three
parallel expansion ports are made available via the module.
Each of up to four WaveBooks, i.e., the base unit plus 3 units connected to its [or the WBK25’s] expansion
ports, can acquire data at 1 MHz, with all acquired data flowing through the Ethernet port and back to the
PC. A sync signal between all “A” and “E” WaveBook devices ensures that the multi-device system will
synchronously acquire data.
One WaveBook/516E can transfer data back to the PC via Ethernet at the full rate
of 1 MSample/sec. When multiple WaveBooks are attached to one Ethernet port,
either through a WaveBook/516E or through a WBK25, the Ethernet may not
support the full sample bandwidth. In this situation, the use of a WBK30 option
may be required. To obtain information regarding the latest improvements in
Ethernet-based transfer rates contact the factory.
In total, up to 288 channels of high-speed input can be measured via one Ethernet link. Beyond that,
additional channels are possible using an Ethernet expansion hub, allowing multiple WaveBook units to be
attached to one PC.
The optional WBK40 and WBK41 expansion modules can be connected to the parallel expansion ports of
the WaveBook/516E, or to the identical expansion ports of the WBK25. Since the WBK40 has its own
200-kHz A/D converter, it does not consume bandwidth from the WaveBook’s 1-MHz A/D. The SYNC
connection insures that both A/Ds measure synchronously.
WaveBook/512A, /516, /516A , /516E 897895 WaveBook Operation Reference 4-5