Appendix B Encoder Specifications
Port Pinouts
© 2012 Harmonic Inc.
45
Electra 1000, Version 3.0, Rev M
B.3.2
Fault Relay/GPI Ports
A contact closure is a physical connection between two platforms that define the state of the
platform by being either on or off.
Both NMX and SAG provide alarm management and redundancy for third party devices
through contact closure monitoring. Additionaly the contact closure on the Electra and Ion-
based encoders can also be used as DPI inputs to the encoder. A contact closure is a
physical connection (Figure B-1) between two platforms that define the state of the platform
by being either on or off. Table B-4 lists the fault relay pinouts. Individual wires need to be
inserted into the contacts and grounded to the ground pin to activate a contact closure.
When configured in the DPI properties page (of either NMX or the SAG) an SCTE35 message
is sent out when that pin is set to low. Each is independent and can be provisioned to any one
channel and multiple available channels.
The fault relay port connects to a Form C relay that can switch up to 0.25 A at 30 VDC. .
Figure B-1: Fault Relay/GPI Ports
Table B-4: Fault Relay/GPI Port Pinout
Pin
Connection
1
Normally closed (NC)
2
Normally open (NO)
3
Common (CM)
4
GPI contact 1
5
GPI contact 2
6
GPI contact 3
7
GPI contact 4
8
Ground (GND)
