Grass Valley LDK 4410 - Manual (Page 20)

20 LDK 4410 + LDK 5420 3G Fiber Transmission System User’s Guide (v1.0)
Chapter 2 - Base station
Open circuit/Voltage level
Leave the circuit open or apply a DC voltage to the inputs (respect polarity). If the circuit is
open, the function is Active (or Inactive). If the voltage is high (4 to 24 V) the function is Inactive
(or Active). The function state depends on the selection the
SYSTEM > SIGNALLING menu:
Menu setting Input is open: Input is 4 to 24V:
OH (open-high) Function is Active Function is Inactive
HO (high-open) Function is Inactive Function is Active
ISO 1a
Open/
4..24 VDC
Open/
4..24 VDC
Open/
4..24 VDC
ISO 1b
On-Air (Tally) 1a
On-Air (Tally) 1b
Call 1a
Call 1b
ISO in ext. send (pin 3)
ISO in ext. return (pin 11)
On-Air in ext. send (pin 4)
On-Air in ext. return (pin 12)
Call in ext. send (pin 5)
Call in ext. return (pin 13)