User's Manual

MODEL 2130 MARKER BEACON
Rev. A April, 2005 2-9
This document contains proprietary information and such information may not be disclosed to others for any
purposes without written permission from SELEX Sistemi Integrati Inc.
Quad UART U25 provides four serial ports of the RMS CCA; the local PMDT, the Marker Beacon1, the Marker Beacon2,
and the FFM1 ports. The local PMDT has two possible connection means; either through USB connector J7 or RS232
header JP4. PMDT local select header JP5 must be strapped properly for either of them to operate. If the RS232 option is
selected (normally only at the factory), U36 performs the RS232-TTL level conversions. If the USB option is selected, U63
performs the USB-TTL translations. U63 is clocked by crystal Y3 and serial EEPROM U5 may be used for USB ID storage.
U63 also toggles LEDs CR11 and CR12 to indicate transmission and reception of USB data.
RS232-TTL converter U36 also translates Marker Beacon1 and Debug header JP6 signals. Debug header JP6 is normally
only used at the factory. The debug signals route to the microcontroller at U8-81 and U8-82. RS232-TTL converter U37
translates the Marker Beacon2 and FFM1 signals before routing to/from quad UART U25.
General purpose I/O from TB1 and TB2 are transient protected by CR27 through CR31 and CR36 through CR44. Resistors
R127 through R130 pull down SPARE_ANA1 (TB1-6) through SPARE_ANA4 (TB1-9) before they route to TEST header
J10 (normally used only at the factory) and multiplexor U33. Test header J10 has most of the general purpose I/O as well
as the PMDT and RCSU tip/ring signals.
Exterior temperature is sensed as EXT_TEMP_TVS- (TB1-2), transient protected by CR25, scaled by R102 and R103, and
buffered by U55:A. The formulae needed to convert the output voltage measured at TP26 to temperature are shown near
U55:A. Interior temperature is sensed by U39, scaled by R104 and R105, and buffered by U55:B. The same formulae apply
for interior temperature as exterior temperature.
Quad UART U20 provides four serial ports of the RMS CCA; the remote PMDT, the RCSU, the FFM2, and the spare
Marker BeaconX ports. The remote PMDT has two possible connection means; either through tip/ring modem U24 via
TB2-10 and TB2-11 (Dialup) or RS232 DB9 connector J6 (*External RMM). Modem select header JP1-4 must be strapped
properly for either of them to operate. If the RS232 option is selected (*External RMM, JP1-4 strapped to JP1-6), U41
performs the RS232-TTL level conversions. If the tip/ring modem option is selected (Dialup, JP1-4 strapped to JP1-2), the
U24 socketmodem performs the tip/ring to TTL translations. Socketmodem U24 also toggles LEDs CR13, CR14, CR15,
CR16, and CR17 to indicate ring, transmission, reception, and handshake status of the dial-up modem.
Two options also exist for the RCSU modem; either through tip/ring modem U26 via TB2-12 and TB2-13 (Dedicated) or
RS232 DB9 connector J5 (*Radio). Modem select header JP1-3 must be strapped properly for either of them to operate. If
the RS232 option is selected (*Radio, JP1-3 strapped to JP1-5), U40 performs the RS232-TTL level conversions. If the
tip/ring modem option is selected (Dedicated, JP1-3 strapped to JP1-1), the U26 socketmodem performs the tip/ring to TTL
translations. Socketmodem U26 also toggles LEDs CR18, CR19, CR32, and CR33 to indicate transmission, reception, and
handshake status of the dedicated modem.
In summary, the strapping of modem select header JP1-4 and JP1-3 selects which sets of TTL level signals are directed
to/from quad UART U20 by buffers U22 and U28.
The tip/ring modem signals of the U24 dial-up socketmodem are filtered and transient protected by FL1, FL2, and CR20
before routing to TB2-10 and TB2-11. The tip/ring modem signals of the U26 dedicated socketmodem are isolated from
common-mode noise by transformer T1, then filtered and transient protected by FL3, FL4, and CR34 before routing to
TB2-12 and TB2-13.
U41 performs the RS232-TTL level conversions for the FFM2 port and U40 performs the RS232-TTL level conversions for
the spare Marker BeaconX port. Either spare Marker Beacon1 or spare Marker Beacon2 port is selected depending on the
strapping of Marker Spares header JP8.
Both the dial-up U24 and dedicated U26 socketmodems have audio outputs routed to Audio header JP7. If enabled, the
audios of the socketmodems, as well as Ident audio mentioned previously, are amplified by U27 and presented at speaker
SPK1. Audio header JP7-5 and JP7-6 must be strapped together to enable the amplifier.