Operation Manual
5. Operation and performance
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C SERIES Operation Manual rev 2.0.0
5.5. GPIO connection and operation
5.5.1. Introduction
C…X ampliers provide extensive GPIO (General Purpose Input / Output) facilities to enable interfacing with third-
party systems for AV control and power sequencing. GPIO functions are accessed through two-pole Phoenix
connectors and DIP-switches on the rear panel.
5.5.2. General Purpose Outputs (GPO)
Two GPOs are provided, with connectors labeled ON (GPO 1) and FAULT (GPO 2). Both operate using internal
relays which respond to external contact closures.
The GPO 1 (ON) is open when the amplier power is off. The GPO 1 relay closes when the amplier power is
turned on, either from the front panel or remotely using NomadLink or the GPI (General Purpose Input).
The GPO 2 (FAULT) relay is open when the amplier is operating normally. The relay closes when the amplier
reports any Fault condition, such as VHF, DC or TEMP.
5.5.3. General Purpose Inputs (GPI)
The GPI functions are enabled only when the front panel Power and Remote switches are both in the ON position.
GPI functions respond to closure of the two associated GPI pins. Two modes of remote power control are
provided, depending on the postion of the DIP-switch “GPI 2 LEVEL TRIG.”
When the GPI 2 LEVEL TRIG DIP-switch is set to OFF:
POWER CONTROL 1 toggles the amplier’s power state (ON or OFF) when the connection goes from Open to
Closed and remains closed for a minimum of approximately 0.2 second. The power state does NOT change if the
connection opens. (This prevents any unintended change in power state should the connection be opened by a
DC signal circuit fault.)
POWER CONTROL 2 also toggles the amplier’s power state (ON or OFF) every time the connection goes from
Open to Closed and remains closed for a minimum of approximately 0.2 second.
This mode provides redundancy, and also accommodates systems with separate closure circuits for ON and OFF
functions.
When GPI 2 LEVEL TRIG DIP-switch is set to ON:
POWER CONTROL 1 connection is disabled. The amplier ignores any change of state on this port.
POWER CONTROL 2 will follow the state of the port. If the connection is closed, the amplier turns on; if the
connection is open the amplier will turn off.