User Manual

MXi AMPLIFIER CONTROLLER BOARD REV.2
PUB06-82 Rev 1 July 17, 2007 06-82-3 MXi Amplifier Controller Board Rev.2
2 GENERAL OPERATIONS
2.1 CONNECTOR AND SIGNAL DEFINITIONS
The connectors on the MXi control board are all shown in Figure 26, which is sheet #3 of the Schematic. The
individual signals that are associated with each pin of the connector are also given. A brief description of each of
the connectors on the board follows.
2.1.1 J1 BDM (Background Debug Mode) Connection
This is used by the software developer to debug the software programmed into the HC08 CPU.
The software program is also downloaded into the HC08 CPU via this connector.
The operator has no real use for this connector since it requires a special interface board.
2.1.2 J2 Remote RS232 Connection
This connector would normally have a nine-pin ribbon cable attached to route the serial signals to the rear panel
nine-pin D-shell connector. Although J2 has 10 pins, only the first nine are actually used with pin 10 being left
open. A typical three-wire serial port (TxD, RxD and Ground) is implemented on this connector to allow interface
to an external laptop or PC.
2.1.3 J3 Front Panel LCD and Touchpad
This uses a nine-wire ribbon cable to send and receive serial data from the Front Panel LCD/Touchpad assembly.
Although J3 has 10 pins, only the first nine are actually used with pin 10 being left open. This connection is a
typical three-wire serial port (TxD, RxD and Ground) that communicates with the LCD/Touchpad.
2.1.4 J4 +32 Volt DC Power Supply
This is a two-pin connector used for the +32VDC power that is supplied to the RF amplifier. The +32V source is
fed into one pin, run through a current sensor on the MXi board and then fed back out the second pin to the RF
Amplifier. This is the manner in which the current that the +32V power supply is measured. The voltage telemetry
sample from the +32V power is also taken from this connector. When an internal power supply without its own
current metering is being used, this connector is functional. If an external power supply with its own current
metering is being utilized, this connector is left open.
2.1.5 J5 +32 Volt DC Power Supply Sensing (External)
This uses a six-pin connector that has all the interface connections for the +32V power supply. Included is an ON
command, P/S OK status and a ground reference from the power supply. In the case where an external power
supply is being used with its own current metering, the +32V sample and the current telemetry is fed into this
connector.
The last signal on this connector is a +12V power supply input (either from the +32V power supply or an external
+12V power supply) that is used to power the MXi controller board itself. The ground reference is shared with that
of the +32V power supply.
2.1.6 J6 Remote Controls
This uses a 15-wire ribbon cable to send status/telemetry and receive commands from the rear panel 15-pin D-
shell connector. Although J6 has 16 pins, only the first nine are actually used with pin 16 being left open. In
addition to the remote signals, there is a single set of contacts made available as an external interlock. This can
connect to an external device or be used as a simple remote ON/OFF.