11
M4.2S User Manual
System Menu
Press and hold the CENTER button for 3 seconds to enter the SYSTEM menu. Use the arrow buttons
to navigate to the desired submenu. To EXIT this menu press the UP arrow to EXIT and press the
CENTER button to exit to the Homescreen.
Figure 4.
Audio Muting
- The M4.2’s audio output can be set to automatically mute for received signals with
signal strength less than 45dBf.
Forcing A-D Split
- The FORCING control is used to select A-D SPLIT mode, functional with AM or FM
HD RadioTM signals. In A-D SPLIT mode, the analog audio outputs and headphone jack provides left
analog program audio in left channel and the left HD RadioTM audio program in right channel. This
mode provides for audio phase matching as well as audio level and time-alignment of the HD RadioTM
broadcast for the correct analog diversity delay. Default mode is off.
Alarms
Program Loss Monitor –
Enabling any alarm will disable tuning, presets and band selection from the
WebServer and M4.2S box User interface.
Program Loss Monitor (PLM) Connections –
The PLM provides five dry, floating relays with outputs
on a rear panel mounted DB15 connector to report selected alarm conditions, including loss of RF
carrier, program audio, OFDM lock and PAD data. Opto-isolated inputs will be triggered by a voltage of
5VDC. The GPIO Alarm output relays are Normally Open and will close when an alarm is active. See
figure 5 below for the DB15 pin-outs:
Alarm Loss of:
No Contact
Common
RF Carrier
5
10
Audio
4
9
OFDM Lock
3
8
Multicast
2
7
PAD/RBDS
1
6
Reset
14
15
Pins not used – (11, 12, 13)
Figure 5.
