System Connectors

Domino Symphony is equipped with a high-density 26-pin male sub-D connector and an internal 26-pin header named System for I/O and system connection.

System Connector

High-density 26-pin male sub-D connector
(bracket viewed from outside)

System connector pins assignment

Pin #	Pin name	Usage
1	IO1	General-purpose I/O line 1
2	GND	Signal ground
3	IO2	General-purpose I/O line 2
4	GND	Signal ground
5	IO3	General-purpose I/O line 3
6	GND	Signal ground
7	IO4	General-purpose I/O line 4
8	GND	Signal ground
9	+5V	5V power supply
10	TRA+	Differential trigger input for camera A
11	TRB+	Differential trigger input for camera B
12	TRC+	Differential trigger input for camera C
13	TRD+	Differential trigger input for camera D
14	STA+	Opto-isolated strobe output for camera A
15	STB+	Opto-isolated strobe output for camera B
16	STC+	Opto-isolated strobe output for camera C
17	STD+	Opto-isolated strobe output for camera D
18	PGND	Power ground
19	TRA-	Differential trigger input for camera A
20	TRB-	Differential trigger input for camera B
21	TRC-	Differential trigger input for camera C
22	TRD-	Differential trigger input for camera D
23	STA-	Opto-isolated strobe output for camera A
24	STB-	Opto-isolated strobe output for camera B
25	STC-	Opto-isolated strobe output for camera C
26	STD-	Opto-isolated strobe output for camera D

System Internal Header

26-pin male receptacle, dual-row 2.54mm pitch, straight shrouded header
(board viewed from component side)

System header pins assignment

Pin #	Pin name	Usage
1	IO4	General-purpose I/O line 4
2	GND	Signal ground
3	IO3	General-purpose I/O line 3
4	GND	Signal ground
5	IO2	General-purpose I/O line 2
6	GND	Signal ground
7	IO1	General-purpose I/O line 1
8	GND	Signal ground
9	STD+	Opto-isolated strobe output for camera D
10	STD-	Opto-isolated strobe output for camera D
11	STC+	Opto-isolated strobe output for camera C
12	STC-	Opto-isolated strobe output for camera C
13	STB+	Opto-isolated strobe output for camera B
14	STB-	Opto-isolated strobe output for camera B
15	STA+	Opto-isolated strobe output for camera A
16	STA-	Opto-isolated strobe output for camera A
17	TRD+	Differential trigger input for camera D
18	TRD-	Differential trigger input for camera D
19	TRC+	Differential trigger input for camera C
20	TRC-	Differential trigger input for camera C
21	TRB+	Differential trigger input for camera B
22	TRB-	Differential trigger input for camera B
23	TRA+	Differential trigger input for camera A
24	TRA-	Differential trigger input for camera A
25	GND	Signal ground
26	GND	Signal ground

Electrical connection of TRx+ and TRx- (x = A, B, C or D) pins depends on the selected electrical style.

When the electrical style is differential (LVDS, RS485, DTTL), the signal has to be connected between the TRx+ and TRx- pins.
When the electrical style is single-ended (TTL, TTLPD, 12V), the signal has to be connected between the TRx+ and the GND pins.

See I/O Operation for the operation of I/O lines.