NI PXI/PXIe-2532/2532B 1-Wire Dual 8×32 Matrix Topology

The NI TB-2644 terminal block creates a 1-wire dual 8×32 matrix topology with the NI PXI/PXIe-2532 (NI 2532). The NI TB-2644B terminal block creates a 1-wire dual 8×32 matrix topology with the NI PXI/PXIe-2532B (NI 2532B).The following figure represents the NI 2532/2532B in the 1-wire dual 8×32 matrix topology.

Making a Connection

For bank 0, both the scanning command, b0r1->b0c1;, and the immediate operation, niSwitch Connect Channels VI or the niSwitch_Connect function with parameters b0r1 and b0c1, result in the following connection:

signal connected to B0R1 is routed to B0C1

For bank 1, both the scanning command, b1r1->b1c1;, and the immediate operation, niSwitch Connect Channels VI or the niSwitch_Connect function with parameters b1r1 and b1c1, result in the following connection:

signal connected to B1R1 is routed to B1C1

Note  While you can, for example, connect B0R1 to B0C0, you cannot connect B0R1 directly to B1C1 in this topology.

Terminal Block Connections

The NI TB-2644 terminal block connects the banks of the NI 2532 to create the 1-wire dual 8×32 matrix topology. The NI TB-2644B terminal block connects the banks of the NI 2532B to create the 1-wire dual 8×32 matrix topology. The following figure illustrates how the native banks on the NI 2532/2532B connect using the NI TB-2644/2644B to create the 1-wire dual 8×32 matrix topology.

Bank Connection Diagram

The following tables list the pin assignments for the NI TB-2644/2644B column ribbon cable headers.

Column Pin Connections

The following table refers to the J3 connector on the NI TB-2644 column connection board and the J3 connector on the NI TB-2644B.

Pin Number	Column	Pin Number	Column	Pin Number	Column	Pin Number	Column
Pin 1	B0C0	Pin 9	B0C4	Pin 17	B0C8	Pin 25	B0C12
Pin 2	B1C0	Pin 10	B1C4	Pin 18	B1C8	Pin 26	B1C12
Pin 3	B0C1	Pin 11	B0C5	Pin 19	B0C9	Pin 27	B0C13
Pin 4	B1C1	Pin 12	B1C5	Pin 20	B1C9	Pin 28	B1C13
Pin 5	B0C2	Pin 13	B0C6	Pin 21	B0C10	Pin 29	B0C14
Pin 6	B1C2	Pin 14	B1C6	Pin 22	B1C10	Pin 30	B1C14
Pin 7	B0C3	Pin 15	B0C7	Pin 23	B0C11	Pin 31	B0C15
Pin 8	B1C3	Pin 16	B1C7	Pin 24	B1C11	Pin 32	B1C15

The following table refers to the J2 connector on the NI TB-2644 column connection board and the J2 connector on the NI TB-2644B.

Pin Number	Column	Pin Number	Column	Pin Number	Column	Pin Number	Column
Pin 1	B0C16	Pin 9	B0C20	Pin 17	B0C24	Pin 25	B0C28
Pin 2	B1C16	Pin 10	B1C20	Pin 18	B1C24	Pin 26	B1C28
Pin 3	B0C17	Pin 11	B0C21	Pin 19	B0C25	Pin 27	B0C29
Pin 4	B1C17	Pin 12	B1C21	Pin 20	B1C25	Pin 28	B1C29
Pin 5	B0C18	Pin 13	B0C22	Pin 21	B0C26	Pin 29	B0C30
Pin 6	B1C18	Pin 14	B1C22	Pin 22	B1C26	Pin 30	B1C30
Pin 7	B0C19	Pin 15	B0C23	Pin 23	B0C27	Pin 31	B0C31
Pin 8	B1C19	Pin 16	B1C23	Pin 24	B1C27	Pin 32	B1C31

Row Pin Connections

The NI TB-2644 and NI TB-2644B provide two ribbon cable headers for row connection. Use one cable header to connect to your application. Use the other cable header for column expansion.

The following table lists the pin assignments for row connection.

Pin Number	Row
1	B0R0
2	B1R0
3	B0R1
4	B1R1
5	B0R2
6	B1R2
7	B0R3
8	B1R3
9	B0R4
10	B1R4
11	B0R5
12	B1R5
13	B0R6
14	B1R6
15	B0R7
16	B1R7

Row Protection Bypass Header

Each row signal is isolated from the reed relays through a 100 Ω resistor. To bypass this resistor, install a jumper on the appropriate pins of the header indicated in the table below. The following table lists the appropriate jumper position for bypassing the resistor on each row signal.

Bypassed Row	NI TB-2644 Module Interface Board		NI TB-2644B
	Header	Pins Connected	Header	Pins Connected
B0R0	N/A	N/A	J14	1-2
B1R0	N/A	N/A	J14	3-4
B0R1	N/A	N/A	J14	5-6
B1R1	N/A	N/A	J14	7-8
B0R2	N/A	N/A	J14	9-10
B1R2	N/A	N/A	J14	11-12
B0R3	N/A	N/A	J14	13-14
B1R3	N/A	N/A	J14	15-16
B0R4	N/A	N/A	J15	1-2
B1R4	N/A	N/A	J15	3-4
B0R5	N/A	N/A	J15	5-6
B1R5	N/A	N/A	J15	7-8
B0R6	N/A	N/A	J15	9-10
B1R6	N/A	N/A	J15	11-12
B0R7	N/A	N/A	J15	13-14
B1R7	N/A	N/A	J15	15-16

Pinout

The following figure identifies the pins for the NI 2532.

Caution  Do not connect to RESERVED pins. Keep low-voltage pins isolated from row and column channels when high voltage is present.

The following figure identifies the pins for the NI 2532B.

Caution  Do not connect to RESERVED pins.