i50 Manual (5.51)
Page 15
© 2018 Datalink Systems, Inc.
www.datalinksystemsinc.com
4.5.5 Using Program connector to access COM1
The Program RJ-45 connector can be configured to access the COM1 signals, in which case the
COM1 DB-9 connector is disabled. This allows easy connection of an external terminal, especially
one requiring a switched power source (which is provided on the Program connector).
Note: external devices connected to the Program connector MUST NOT activate the RESET
line (DTR on), or else the i50 CPU will reset and stop working until the line is deactivated.
4.6 Antenna Connectors
The front panel provides Wi-Fi, Iridium and cellular antenna connectors (SMA). Each connector will
only be present if the matching modem is installed internally.
The back panel includes the GPS antenna connector (SMA). This connector provides a 3.3 VDC
output for an active antenna. The i50 will turn off this voltage if it detects a shorted antenna cable,
and periodically retry applying power until the fault is corrected.
Note: antennas should always be attached before applying power to the i50 to prevent
damage to internal modems and also to allow the GPS receiver to perform automatic noise
profiling.