User's Manual

Configuration
RFI-148 & RFI-900 High Output Power Paging Transmitters User Manual Page 22 of 134
TRANSMIT ON
FAULT
LOW POWER
HIGH VSWR
SERIAL/ETHERNET
POWER
25
250
125
TX POWER (W)
Figure 12: Front Panel Display
3.7 LIU Interface
The LIU interface is a DC-37 female connector at the rear of the paging transmitter. The pin-out for the LIU
Interface can be found in Appendix A.4. The LIU interface has ten digital inputs
1
and fourteen alarm outputs.
The alarm outputs are numbered 1 to 13 with an additional combined alarm and are configurable. The digital
inputs are:
• Frequency Select 1
• Frequency Select 2
• Frequency Select 3
• Frequency Select 4
• Protocol Select
• Hardware PTT
• Tx Data L-bit
• Tx Data H-bit
• Transmit Clock
• Aux Input 1 (RFI-148 only) – can be configured to trigger a fault
• Aux Input 2 – can be configured to trigger a pre-defined page event
Use of the hardware PTT, protocol select and frequency select inputs are all optional and may be disabled in
software. The use of the transmit clock is optional for 2-level protocols, but required for 4-level protocols.
1
RFI-148 has an extra, general purpose input “Aux Input 1,” for a combined total of 11.