Telos ZephyrExpress - Manual (Page 56)

Z EPHYR E XPRESS HARDWARE 3-15
+5V
+30V Max
Parallel logic input circuit.
Outputs
The outputs are open-collector closures to ground, active low. They require a pull-up
resistor to use with logic-circuit inputs. The pull-up may be built into the external device;
if not, use a 2.2k
W resistor to the port’s +5v supply.
Current should be limited to 400mA for each individual output and no more than 1 amp
total. This isn’t a problem with logic circuits or individual LEDs, but you should check
current consumption if using solid-state audible alarms, relays, or incandescent lights.
If used with a relay or LED, wire the other side of that component to the port’s +5v
supply; or wire to an external supply (no more than +24 v) and connect that supply’s
ground to the port’s ground on pin 1.
w
WARNING!
LEDs and low-voltage relays connected to ZephyrExpress’ power supply need a
current-limiting resistor in series.
About the XLR Connectors
Audio i/o section
Microphone
Inputs
Monitor 1 Mixer Outputs
Left Right
1 Line Inputs 2
(XLR or 1/4” 2- or 3-conductor)
Chan A Chan B
Direct Receive Outputs
Mon Mix 2 MonMix 1
Headphone Outputs (Stereo)