AN-6131API
7
Holt Integrated Circuits
Run the TeraTerm program. At the
New Connection
screen, select
(x)Serial
and choose the
selected COM port. Click
Setup
then
Serial Port
to open the serial port setup window. Choose
these settings: Baud Rate: 115200, Data: 8 bits, Parity: none, Stop: 1 bit, Flow Control: none.
3.
After configuring the Console port, connect the DB-9 serial cable to the PC.
4.
Do not connect the included USB debugger cable between the DEBUG port on the lower (MCU)
board and the PC until instructed to, later.
5.
To observe bus activity, connect an oscilloscope to the red test points labeled BUS A and BUS B.
The test point labeled ACTIVE is a convenient scope trigger signal that goes high at start of
message and goes low at message completion.
6.
If not connected by cable to actual MIL-STD-1553 buses, provide resistive dummy loads for buses
A and B by connecting a 75 Ω 1/2 Watt (or any value between 70-80 Ω) resistor across each pair
of red and black Bus test points. (For this demonstration, half-Watt resistors are adequate
because duty cycle is sufficiently low. When using the on-chip HI-6131 to generate BC messages
directed to on-chip RTs, use external 75 Ω resistor loads. When using a bus coupler to connect to
actual MIL-STD-1553 buses, do not use the 75 Ω dummy load resistors.
7.
Set SW8 configuration DIP switches labeled AUTOEN and COPYREQ off (down position). These
switches are not used by this version of the demo program so they can be repurposed by the user.
8.
Plug-in the provided 5V DC power supply and connect the cable to the power input jack on the
lower circuit board. If TeraTerm is running and configured correctly, the command menu below
should appear in the console window.
9.
This menu appears and three green LEDs will flash momentarily whenever the board power is
applied, or when the RESET pushbutton is pressed. After verifying correct
TeraTerm
communication with the evaluation board, the terminal set up can be saved by clicking
Setup
then
Save Setup
.
The dates and times shown will differ from the screen captures shown below.
