Measurement Computing LogBook Series - Manual (Page 50)

4-6 System Expansion 957096 LogBook User’s Manual
P1, P2, and P3 Port Connectors
LogBooks have three port connectors: P1, P2, and P3. For LogBook/300, these connectors are located on
the rear panel. For LogBook/360, they are on the front panel as discussed in the following note.
Connector pinouts begin on the next page.
Note: LogBook/360 actually has two sets of P1, P2, and P3 connectors, one internal set located on the
motherboard, and one external set located on the unit’s front panel. LogBook/360’s front panel P1,
P2, and P3 connectors connect to the motherboard’s P1, P2, and P3 via ribbon cables.
P1 (Analog Input)
LogBook’s P1 connector is compatible with all DBK options. Features and capabilities of P1 signals
include:
• High-performance signal connection for: ±10 V and 0-20 V input ranges, gains from ×1 to ×64 (each
gain and range calibrated individually), and an input stage with low crosstalk, high dynamic
impedance, small signal injection.
• All calibration is performed digitally; there are no pots to adjust.
• The sequencer depth (the number of channel readings in a scan) is 1024 analog channels and 128
digital channels.
• P1 includes an enhanced DBK-50 protocol that allows DBK cards or modules to identify themselves
and carry their own calibration data. These same connections provide for complete configuration of
DBK cards with that capability, while not requiring the use of jumpers.
CAUTION
For analog signal inputs via P1, do not exceed -35 VDC or +45 VDC or
equipment damage may result.
P2 (Digital I/O)
P2 is used with various kinds of digital I/O. For autonomous operation without an attached PC, the P2
outputs may be preset before the acquisition. The P2 digital outputs may be used as alarm outputs to
identify the detection of specified levels in the acquired data.
P3 (Pulse Frequency, High-Speed Digital I/O)
Features and capabilities of P3 signals include:
• Four 16-bit pulse counter channels that can be scanned along with analog inputs
• Additional digital I/O control lines for high-speed digital input and output.
• Four optional, internal, 16-bit ±10 V analog output channels (LBK2), useable for waveform or
control output, or additional control lines for external analog output expansion.
The 16 high-speed digital I/O lines, along with the additional digital I/O control lines can now be used for
real-time digital peripherals such as expanded digital input, or current or voltage DACs.
Optional, internal four-channel 16-bit waveform/control ±10 V DACs on P3:
• Initially setup to a static, preprogrammed voltage at the beginning of the acquisition.
• In the future, may be used for waveform or control outputs.
P1, P2, and P3 Pinout Tables
You can connect signals to LogBook’s P1, P2, and P3 port connectors using a CA-37-x cable
(via a D-shell 37-pin female connector), or a DBK11 screw-terminal card with component sockets.
This page and the next two contain P1, P2, and P3 pinouts.