Table 4, For a, Fer to – Grass Valley Maestro Master Control v.2.4.0 User Manual
Page 111: Figure 54

107
MAESTRO User Manual
Section 2 — The Maestro Configuration Editor
Table 4. Maestro Rear Panel, GPIO 44-pin Connector Pinouts
Figure 54. GPIO Port Circuitry
Shielded 44-Pin D; socket
contacts
Pin
GPIO
Pin
GPIO
1
1A
23
10A
2
1B
24
10B
3
2A
25
GND
4
2B
26
11A
5
GND
27
11B
6
3A
28
12A
7
3B
29
12B
8
4A
30
GND
9
4B
31
13A
10
GND
32
13B
11
5A
33
14A
12
5B
34
14B
13
6A
35
GND
14
6B
36
15A
15
GND
37
15B
16
7A
38
16A
17
7B
39
16B
18
8A
40
GND
19
8B
41
NC
20
GND
42
NC
21
9A
43
LTC RX IN+
22
9B
44
LTC RX IN–
D-50 Female
Pin
18
Pin
34
Pin
34
Pin
1
Pin
50
Pin
17
V
CC
From
Maestro
logic
GPIO
rear panel
connector
To
Maestro
logic
V
OUT
ON = 3-10 V, 4.25 mA max.
Input photocoupler
NEC PS2705-1
Maximum current through relay = 250 mA
Maximum voltage for relay = 10 V
Output relay
International Rectifier PVG613
2.2 K, 0.1 W
B
A
10K
Note: To prevent a ground loop, use pins
"A" and "B" only when connecting Maestro
to an external device. Do not connect a third
conductor as a common ground path (e.g.,
do not connect the connector shields).
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