Measurement Computing WaveBook rev.3.0 - Manual (Page 27)

WaveBook User’s Manual 6-23-99 WaveBook Setup 2-5
A single-ended signal source needs to have its common connected to ANALOG COMMON.
When connecting several signal source commons to ANALOG COMMON, it is important that there is no voltage
potential [between these signal source commons]. Otherwise, ground currents will circulate, leading to measurement
errors.
If there is a fixed voltage potential between multiple signal source commons, then only one of these signal source
commons needs connected to ANALOG COMMON. This is true as long as the common mode voltage of any input
does not exceed ±11 volts.
Digital I/O Connection (WaveBook/512 and /512H)*
*Note: The following pinout can be used for WaveBook/516, providing the unit is in the 8-bit mode (instead of 16-bit).
If using this pinout for WaveBook/516 (in 8-bit mode), pin 20 will be assigned to external clock input.
With the WaveBook/512 series, the following signals are present on
the DB25F high-speed digital I/O connector.
• 8 Digital I/O Lines (D8 – D15)
• 5 Address Lines (A0 –A4)
• Active-low Digital I/O Enable output (EN-)
• Active-low Digital I/O Write Strobe (WR-)
• Active-low Digital I/O Read Strobe (RD-)
• TTL Trigger Input (TTLTRG)
• +15 V (pin 23), -15 V (pin 22), 50 mA max. (each)
• two +5 V power (pins 19 and 21), 250 mA max. (total)
• three Digital Grounds (pins 20, 24, and 25)
Digital I/O Connections, WaveBook/512
D8-D15 Digital I/O data lines
A0-A4 Digital I/O address lines
EN- Active-low digital I/O enable
To sample just 8 digital input signals, connect them directly to the
digital I/O data lines. D15 is the most significant bit, and D8 is the
least. The address lines, the read and write strobes, and enable signal
may all be left disconnected.
RD- Active-low read strobe
WR- Active-low write strobe
TTLTRG TTL trigger input
+5 VDC 250 mA maximum
+15,-15 VDC 50 mA maximum (each)
Reference Note: To use digital I/O address lines
(A0 –A4) to select from up to 32 input bytes, or to use the
digital I/O port for output, refer to chapter 8,
Theory of Operation.
Digital Grounds Pins 20, 24, and 25
Digital I/O Connection (WaveBook/516 Only) 16-bit mode*
Digital I/O Connections, WaveBook/516
D0 – D15 High Speed Digital I/O data lines
TTLTRG TTL trigger input
External Clock 16 bit mode, read/write strobe
+5 VDC 250 mA maximum
+15,-15 VDC 50 mA maximum (each)
With the WaveBook/516 series, the following signals are present on
the DB25F high-speed digital I/O connector.
• 16 High-Speed Digital I/O Lines (D0 through D15)
• TTL Trigger Input (TTLTRG)
• +15 V (pin 23), -15 V (pin 22), 50 mA max. (each)
• two +5 V (pin 19 and pin 21), 250 mA max. (total)
• External Clock (pin 20)
• two Digital Grounds (pins 24 and 25)
To sample just 16 digital input signals, connect them directly to
the digital I/O data lines. D15 is the most significant bit, and D0
is the least.
*Note: For 8-bit mode, refer to the WaveBook/512 pinout, with noted
exception that pin 20 is for an external clock (with
WaveBook/516).
Note: The following figure depicts WaveBook/516’s Front Panel,
showing the DB25 connector and cable for External Clock and
TTL External Trigger.
Digital Grounds Pins 24 and25