ADLINK PXI-7921 - Manual (Page 19)

Signal Connection • 13
COM0± (one wire)
COM<0..3>± (two wire)
COM<0..1>A±(four wire)
COM<0..1>B± (four wire) Input/Output Common---The common for each bank.
CH<0..47> (one wire)
CH<0..23>± (two wire)
CH<0..11>A± (four wire)
CH<0..11>B± (four wire) Input/Output Channels---Where signals are connected
to the switch card. CHχ+ and CHχ- are
switched together.
Table 4: Pin Description
3.3 TB-6221 Terminal Board
Users can use the TB-6221 terminal board that consists of a printed circuit
with screw terminals. The terminal block connects directly to the front panel
I/O connector of the PXI-7921.
The TB-6221’s default printed circuit is in 2-wire mode. If other configuration
is preferred, user can refer the table on TB-6221 to identify the pin
connected.