Lab.gruppen C Series 5:4X - Manual (Page 27)

C Series C 20:8X, C 10:8X, C 10:4X and C 5:4X Operation Manual rev. 1.1.4
Operation and Performance
20
5.5 GPIO connection and operation
5.5.1 Introduction
C…X amplifiers 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 7.5.2 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 amplifier power is off. The GPO 1 relay closes when the amplifier 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 amplifier is operating normally. The relay closes when the amplifier
reports any Fault condition, such as VHF, DC or TEMP. See section 6.6.
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 amplifier’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 amplifier’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 amplifier ignores any change of state on this port.
POWER CONTROL 2 will follow the state of the port. If the connection is closed, the amplifier turns on; if the
connection is open the amplifier will turn off.