Pro Tools | SYNC HD Guide
78
Bi-phase/Tach/GPI/Pilot Port (Accessory Port) Connector Pin Assignments
Pin #
Name
Description
1
GPOUT0
GPI TTL-level output 0
2
GPOUT1
GPI TTL-level output 1
3
GPOUT0_A
GPI Relay 0, contact A
4
GPOUT0_B
GPI Relay 0, contact B
5
GPOUT1_A
GPI Relay 1, contact A
6
GPOUT1_B
GPI Relay 1, contact B
7
GPOUT2_A
GPI Relay 2, contact A
8
GPOUT2_B
GPI Relay 2, contact B
9
GPOUT3_A
GPI Relay 3, contact A
10
GPOUT3_B
GPI Relay 3, contact B
11
OPTRETURN
Return from Bi-phase/Tach opto-isolators
12
BIPHB_I
Input to Bi-phase/Tach opto-isolator B
13
BIPHA_I
Input to Bi-phase/Tach opto-isolator A
14
GND
Chassis ground
15
PILOT_IN–
Pilot tone input, negative
16
P
Pilot tone input, positive
17
RET0
Return from GPI opto-isolator “0”
18
GPIN0
Input to GPI opto-isolator “0”
19
RET1
Return from GPI opto-isolator “1”
20
GPIN1
Input to GPI opto-isolator “1”
21
RET2
Return from GPI opto-isolator “2”
22
GPIN2
Input to GPI opto-isolator “2”
23
RET3
Return from GPI opto-isolator “3”
24
GPIN3
Input to GPI opto-isolator “3”
25
VDD
+12V DC
Shell
GND
Connected to chassis ground
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