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DS2/DS4 Hardware Manual
Page 13
4.3.2
SCT-AIM104 Link Settings
When used in a Director, a few jumpers are necessary on the SCT-AIM104 baseboard for proper use with
certain I/O boards. These links are located on the bottom of the PC/104 pins, and connect certain IRQ lines
together on the processor card. The pins are on the outer set of pins for the shorter section of the PC/104
header. Certain cards used in the Director were built to operate with a certain IRQ, but those IRQs were not
available on the AIM104-386EX processor.
AIM104-Ether: Board uses IRQ15, but 386EX uses IRQ14
AIM104-COM4: Last COM port uses IRQ11, but 386EX uses IRQ12
PL5
PL4
Front row PC/104
pins (D0)
Connects IRQ11 to IRQ12
Connects IRQ14 to IRQ15
Drg. S15040-04b
Other important jumpers on the SCT-AIM104 baseboard select COM3 to be RS-232 or RS-485, and
enable/disable the on-board battery. The links JP1-JP4 are located at the back of the baseboard and should all
be moved to either the “RS232” or “RS485”, and JP5 is located next to the battery.
JP1
JP2
RS232
COM3 in RS-232 mode.
JP3
JP4
RS485
COM3 in 2-wire RS-485 mode.
JP5
Removed
Battery backup disabled. When removed, the real-time clock will
not be maintained after power is removed. This is the default
position.
Fitted
Battery backup enabled. When fitted, the real-time clock is
maintained after power is removed.