Measurement Computing USB-2527 - Manual (Page 23)

USB-2527 User's Guide Functional Details
23
SCSI - 68 pin (P5) connector
The 68-pin SCSI connector includes pins for the following:
 16 single-ended/eight differential analog inputs
 Four analog outputs
 24 digital I/O
 Four counter inputs
 Two timer outputs
 Input scan pacer clock I/O
 Output scan pacer clock I/O
 TTL trigger
 self calibration
 +5 VDC
 analog commons
 digital commons
40-pin headers (J5, J6, J7, J8)
Four 40-pin headers (J5 through J8) provide alternative connections to the signals of the SCSI connector. You
can get a female connector for each header by connecting a C40FF-x cable (40-pin header to female 40-pin
header) to each header.
9-slot screw terminal (TB7)
You can use the on-board screw terminal connector (TB7) to connect up to four TC inputs. TB7 uses the
following analog channels to obtain its four differential channels:
 TC CH0: CH 0 (+); CH 8 (-)
 TC CH1: CH 1 (+); CH 9 (-)
 TC CH2: CH 2 (+); CH 10 (-)
 TC CH3: CH 3 (+); CH 11 (-)
When using the thermocouple channels, do not connect signals to the associated channels on the SCSI
connector or J5.
External power connector
Although the USB-2527 is powered by a USB port on a host PC, an external power connector is available when
the host PC’s USB port cannot supply adequate power, or if you prefer to use a separate power source.
Connect the optional PS-9V1AEPS-2500 power supply to the external power supply connector. This power
supply plugs into a standard 120 VAC outlet and supplies 9 VDC, 1 A power to the USB-2527.