7700 MultiFrame Manual
7707IT Multi-Channel Intercom Fiber Transceiver
Page - 24
Revision 1.7
CTRL
To turn the failsafe bias on or off, select the
CTRL
menu item in menu level
1. The 7707IT allows a failsafe bias threshold to be set for each channel.
Use the toggle switch to choose the channel for which you want to adjust
the detection threshold. Press the pushbutton to apply the displayed
selection.
CH01
to
CH08:
Range of channels for the 7707IT-8.
CH01
to
CH03:
Range of channels for the 7707IT-3.
Use the toggle switch to select the
BIAS
menu item and press the
pushbutton. The toggle switch may then be used to turn the failsafe bias on
or off. Use the toggle switch to select the desired state then press the
pushbutton to apply the displayed selection and return to menu level 3. You
can select other items on menu level 3, or select the
BACK
menu item to
return to menu level 2.
ON:
The failsafe bias is selected as active.
OFF:
The failsafe bias is selected as inactive.
The factory default configuration turns the failsafe bias
OFF
. Changing the
interface profile will restore the factory default failsafe bias state for the
respective channel(s).
CH01 to CH03 or
CH08
BIAS
ON
OFF
4.2.10. Selecting the RS485 Serial Data Rate
When the profile is set to TXMX (RTS/Telex Matrix), this menu item becomes available. It allows the data
rate of the RS485 serial data link to be changed. The default rate is 9.6 kbps, which supports many
RTS/Telex matrix systems. Newer systems may use 76.8 kbps as the serial rate, which is the next setting
that should be used if issues are encountered.
