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Owners Manual
2800 Series Marquee
1.9 The AB-2476-020 Processor Board
After 120VAC power and RS-232/485 communications wiring has been installed, take a closer look at the
AB-2476-020 5
th
generation 2800 processor board, pictured below. The first four 2800 generations used a 2Mhz
MC6803 processor with firmware written in assembly language. The 5
th
generation 2800 uses a 4Mhz
MC68HC11 processor chip with C language and multi-tasking support. This allows the 5
th
generation 2800 to do
things that the previous generations could not, such as display static and scrolling 2” text at the same time.
However it also renders the 5
th
generation processor board incompatible with all custom firmware written for
previous generations of 2800 marquee. Do not install firmware chips removed from previous generations of 2800
into a 5
th
generation 2800.
Take special note of the five LED indicator lamps on the AB-2476-020 processor board. The indicator lamps can
be quite helpful when trying to debug problems. The POWER indicator illuminates when the processor board has
power. The RXD indicator flashes when characters are received via RS-232 or RS-485. The TXD indicator
flashes when characters are transmitted via RS-232. The ENB indicator flashes when characters are transmitted
via RS-485. The RELAY indicator illuminates when the mechanical relay output is activated.
Also take note of the dip switch blocks and jumper headers which are used for configuring hardware options. The
next few manual sections will cover setting these options.
Page 8 PB-2149-335B
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