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1 Digital Inputs
2 Digital Outputs
3 Analog Outputs
4 Analog Inputs

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

Detailed pin assignments for all connectors can be found in the System Description document provided with your order.

Before designing cables, OPAL-RT recommends using the guideline Simulator EMC cable recommendations.

Digital Inputs

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

Connector P1 - Din channels 00 to 15
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.

Connector P2 - Dout channels 00 to 15
DB37F Pin	Assignment	DB37F Pin	Assignment
1	+DOUT00	20	GND_DOUT^†
2	+DOUT01	21	GND_DOUT
3	+DOUT02	22	GND_DOUT
4	+DOUT03	23	GND_DOUT
5	+DOUT04	24	GND_DOUT
6	+DOUT05	25	GND_DOUT
7	+DOUT06	26	GND_DOUT
8	+DOUT07	27	GND_DOUT
9	+DOUT08	28	GND_DOUT
10	+DOUT09	29	GND_DOUT
11	+DOUT10	30	GND_DOUT
12	+DOUT11	31	GND_DOUT
13	+DOUT12	32	GND_DOUT
14	+DOUT13	33	GND_DOUT
15	+DOUT14	34	GND_DOUT
16	+DOUT15	35	GND_DOUT
17	12V_PROT*	36	GND
18	Vuser (in )^‡	37	GND_DOUT
19	GND

* 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.

Connector P3 - Aout channels 00 to 15				Connector P4 - Aout channels 16 to 23
D37F Pin	Assignment Pin	DB37F Pin	Assignment Pin	D37F Pin	Assignment Pin	DB37F Pin	Assignment Pin
1	+AOUT00	20	GND	1	+AOUT16	20	GND
2	+AOUT01	21	GND	2	+AOUT17	21	GND
3	+AOUT02	22	GND	3	+AOUT18	22	GND
4	+AOUT03	23	GND	4	+AOUT19	23	GND
5	+AOUT04	24	GND	5	+AOUT20	24	GND
6	+AOUT05	25	GND	6	+AOUT21	25	GND
7	+AOUT06	26	GND	7	+AOUT22	26	GND
8	+AOUT07	27	GND	8	+AOUT23	27	GND
9	+AOUT08	28	GND	9		28	GND
10	+AOUT09	29	GND	10		29	GND
11	+AOUT10	30	GND	11		30	GND
12	+AOUT11	31	GND	12		31	GND
13	+AOUT12	32	GND	13		32	GND
14	+AOUT13	33	GND	14		33	GND
15	+AOUT14	34	GND	15		34	GND
16	+AOUT15	35	GND	16		35	GND
17	12V_PROT*	36	GND	17	12 V_PROT*	36	GND
18	100 nF to pin 37	37	See pin 18	18	100 nF to pin 37	37	See pin 18
19	GND			19	GND

* 12 V protected supply available to user. 1 A maximum current

Analog Inputs

Ain on the OP48H20 module uses connector P4 (partially) and are numbered AIN00 to AIN07.

Connector P4 - Ain channels 01 to 07
DB37F Pin	Assignment Pin	DB37F Pin	Assignment Pin
1		20	GND
2		21	GND
3		22	GND
4		23	GND
5		24	GND
6		25	GND
7		26	GND
8		27	GND
9	+AIN00	28	GND
10	+AIN01	29	GND
11	+AIN02	30	GND
12	+AIN03	31	GND
13	+AIN04	32	GND
14	+AIN05	33	GND
15	+AIN06	34	GND
16	+AIN07	35	GND
17	12V_PROT*	36	GND
18	100 nF to pin 37	37	See pin 18
19	GND