Measurement Computing USB-2627 - Manual (Page 12)

USB-2627 User's Guide Signal Connections
12
TB2 terminal SCSI pin TB1 terminal SCSI pin
CNT3 38 XDAC1 21
TMR0 3 AGND AGND
TMR1 37 XAPCR 2
XDPCR 1 GND GND
GND GND EGND SCSI shell
Do not make connections to any terminal labeled NC.
Note 1: Labeled POSREF on the TB-100; not supported on the USB-2627.
Note 2: Labeled NEGREF on the TB-100; not supported on the USB-2627.
40-pin header connectors J2, J4, and J5
The header connectors provide alternative connections to the 68-pin connector. Pins 1, 2, 39, and 40 are labeled
on each connector.
J2 provides analog input connections. J4 provides digital, counter, timer, pacer input, and power output
connections. J5 provides analog output, timer, pacer I/O, and power output connections.
Caution!
Avoid redundant connections! Make sure there is no signal conflict between the SCSI connector
pins and header connector pins. Failure to do so could possibly cause equipment damage and/or
personal injury.
Figure 4 shows the pinout for J2.
Figure 4. Header connector J2 pinout