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7.15.4
Infra-red LED wiring
The LED PPM drive outputs are active LOW and must connect to the cathode side of the
LED. All of the Anode ends of the LED's must connect to the +5v supply provided on
pin 17.
7.15.5
Installation Aid – L12
The RD490 module is fitted with an LED (green) to indicate that IR data is being
transmitted from the IR ports on the module. When an infrared LED is correctly
connected to the RD490 Module (as detailed above), L12 will momentarily light as IR
data is transmitted. This feature is extremely helpful when fault finding IR remote
controlled peripheral devices connected to the RD490. L12 is connected in series with
the output drive so if remote IR LED's are not correctly connected, or cabling is open-
circuit, this LED will not light during IR transmission.
7.15.6
DIP Switch Settings
The RD490 module can be used to provide Infra-red (PPM) control of VCR equipment or
send commands to ONE only RS-232 serial communications device, such as a time-
lapse VCR or multiplexer. Although support of the earlier MAX-1000 Version- 3 systems
is possible, usually only version-4 modes would be selected. Use of the PPM and RS-
232 user defined modes can also be selected. Refer to the section in this document
titled, IR LEARN MODE.
Rev. C
IR LED CONNECTION DETAILS
PIN 17
PPM OUT
(PINS 5-12)
CAUTION: The center frequency of the LED PPM drive
output has been factory-set to 36KHz. This is suitable for
most VCR types. If VCR control problems are
experienced, try adjusting RV1, which will vary this center
frequency. (Check wiring and dip switch settings
BEFORE adjusting RV1).
7.15-3
HMXMU001018
10/06
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