RabbitCore RCM2000 Series, Руководство по началу работы

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8 RabbitCore RCM2200
2.2.2 Prototyping Board Expansion
The Prototyping Board comes with several unpopulated areas, which may be filled with
components to suit the user’s development needs. After you have experimented with the
sample programs in Section 3.4, you may wish to expand the board’s capabilities for fur-
ther experimentation and development. Refer to the Prototyping Board schematic (090–
0122) for details as necessary.
• Module Extension Headers
—The complete pin sets of both the Master and Slave
RabbitCore modules are duplicated at these two sets of headers. Developers can solder
wires directly into the appropriate holes, or, for more flexible development, 26-pin
header strips can be soldered into place. See Figure 1 for the header pinouts.
•
RS-232 —Two 2-wire or one 4-wire RS-232 serial port can be added to the Prototyping
Board by installing a driver IC and four capacitors. The Maxim MAX232CPE driver
chip or a similar device is recommended for the U2. Refer to the Prototyping Board
schematic for additional details.
A 10-pin 0.1-inch spacing header strip can be installed at J6 to permit connection of a
ribbon cable leading to a standard DE-9 serial connector.
All RS-232 port components mount to the underside of the Prototyping Board, between
the Master module connectors.
NOTE: The RS-232 chip, capacitors and header strip are available from electronics dis-
tributors such as Digi-Key.
•
Prototyping Board Component Header —Four I/O pins from the module are hard-
wired to the Prototyping Board LEDs and switches.
To disconnect these devices and permit the
pins to be used for other purposes, cut the
traces between the pin rows of JP1. Use a
knife or similar tool to cut or break the
traces crossing JP1 in the area between the
silk-screened arrows, as indicated in
Figure 3.
Use jumpers across the positions on JP1 if
you need to reconnect any of the devices
later on.
Figure 3. Prototyping Board Header JP1
(located on BOTTOM SIDE of board)
Cut Cut
PE1 PE7 PB2 PB3
JP1
DS2 DS3 S2 S3