HOLT ADK-620x3, Руководство пользователя, Страница: 15 / 33

Holt Integrated Circuits
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4. The message data for the Major/Minor frames is contained in the bcdemo.c program and can
easily edited. As shipped RT address 3 is used.
RT Mode, using an external BC
Use an external BC tester (such as Ballard USB 1553) to transmit messages to the demo
board.
1. When an external BC is connected using conventional 1553 buses, use cables to connect the
demo board circular tri-axial bus jacks to bus coupler ports on the A and B bus networks. In this
case, the on-board dummy bus load 70Ω resistors should be disconnected. If bus couplers are
not readily available, bench testing can be done by enabling the on-board dummy bus load 70 Ω
resistors (R4, 5) and connecting BC tester cables directly to the demo board tri-axial jacks for
buses A and B.
2. Press ‘w’ command to reset device, then ‘r’ to set RT mode. This configures the HI-620x3 into an
RT terminal, with the address set on DIP switch SW1. The screen below will be displayed.
3. RT is set to single buffered mode. This RT set up supports data write and read from RT Sub-
address 1 and most mode codes, please refer to Holts API software manual for more details.