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1. General Description
1.1 Unique features of recorder
The RD8900 is a well-designed paperless recorder with many outstanding features including:
• 6.1 TFT Color LCD with VGA Display in 640x480 pixels.
• 18 isolated Analog Inputs
• Plug & play I/O cards for easy expansion
• Simple and friendly operation
• Infrared detector to prolong lifetime of LCD
• Solid storage media CF card in high capacity
• 174 mm short depth
• Ethernet as standard and optional RS-232/422/485 communication
• High accuracy 18-bit A-D Analog Input
• 15-bit D-A Analog Output.
• 200 milli second sample rate.
• Bench top with convenient portable handle, easy converted into panel mount
1.2 Expandable Input and Output Cards
The recorder is equipped with six-rear expansion slots, which work flexibly with the following
plug & play I/O cards.
Analog Input cards (part number AI181, AI182, AI183 ) : These three cards are used for 1, 2,
& 3-channel analog input. Each input is isolated from each other to avoid noise and to ensure
stable measurement. Analog input is configured by DIP switches and jumpers on the card
before plugging into rear expansion slot. Refer 2.3 Setting Input and Output Cards.
Digital Output card ( DO181 ): Each card includes 6 alarm relays. Contacts are rated 5
Amp/240 VAC
Digital Input card ( DI181 ): Each card includes 6 channels. Logic Low: -5V minimum, 0.8V
maximum, Logic High: -2V minimum, 5V maximum
1.3 Communication
The standard communication interface is Ethernet with protocol IEEE 802.3 - 10 Base T. Other
options are RS-232 / RS-422 / RS-485.