7700 MultiFrame Manual
7707IT Multi-Channel Intercom Fiber Transceiver
Page - 34
Revision 1.7
7.5.2.2. Data Fail Safe Bias Status
The 7707IT provides a selectable failsafe bias for balanced serial data signals. This bias should be active
as required by the specific application, and common practice. The failsafe bias will apply a differential
+200mV bias to a properly designed RS-485 system while in the idle state. As a protection feature, the
failsafe bias will not become active unless the termination is also active for the respective channel. The
failsafe bias circuit of the 7707IT will function properly over the specified input common mode range. For
the sake of brevity, only
Data Fail Safe Bias 1
will be discussed in the manual.
Data Fail Safe Bias 1:
When set to “Active,” the failsafe bias is on. When set to “Not active,” the
failsafe bias is off.
7.5.3. Monitor
The
Monitor
tab, as illustrated in Figure 7-3, indicates the signal status of input audio, output audio, input
data, and output data.
Please note that three channels will be available while using the 7707IT-3-F2 and
eight channels will be available while using the 7707IT-8-F2.
Figure 7-3: Monitor Tab
7.5.3.1. Card Configuration Monitor
Card ID Jumper:
Indicates the position of the “CARD ID Jumper.”
Card Type:
Indicates the hardware version.
