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The following tables provide the general pin assignments for the OP48H20 DB37 connectors.

Digital Inputs

Din uses connector P1 and are numbered from DIN00 to DIN15.

Open

Connector P1 - Din channels 00 to 15				Open OP48H20 DB37 P1 Din pin assignment
DB37F Pin	Assignment	DB37F Pin	Assignment
1	+DIN00	20	GND_DIN†
2	+DIN01	21	GND_DIN
3	+DIN02	22	GND_DIN
4	+DIN03	23	GND_DIN
5	+DIN04	24	GND_DIN
6	+DIN05	25	GND_DIN
7	+DIN06	26	GND_DIN
8	+DIN07	27	GND_DIN
9	+DIN08	28	GND_DIN
10	+DIN09	29	GND_DIN
11	+DIN10	30	GND_DIN
12	+DIN11	31	GND_DIN
13	+DIN12	32	GND_DIN
14	+DIN13	33	GND_DIN
15	+DIN14	34	GND_DIN
16	+DIN15	35	GND_DIN
17	+12V_PROT*	36	GND
18	100 nF to pin 37	37	See pin 18
19	GND

* 12 V protected supply available to user. 1 A maximum current
† Isolated digital ground

Digital Outputs

Dout uses connector P2 and are numbered from DOUT00 to DOUT15.

* 12 V protected supply available to user. 1 A maximum current
† Isolated digital ground
‡ User-provided voltage supply for digital outputs. 5-30 V, referenced to GND_DOUT.

If no voltage is provided on pins 18-37, digital outputs will not work. The user can use its own voltage or alternatively feedback 12V_PROT into pins 18-37. This can be done using a loopback card (126-0361) or an external wiring harness. See knowledge base article AA-01025 - How to power the different DB37 boards for digital outputs for more details.

Analog Outputs

Aout on the OP48H20 module uses connector P3 and P4 (partially) and are numbered AOUT00 to AOUT23.