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Summary of Contents for Emerson NI-9871
- Page 1 NI-9871 Getting Started 2024-02-22...
- Page 2 NI-9871 Getting Started........
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Page 3: Ni-9871 Hardware Overview
NI-9871 Getting Started NI-9871 Getting Started NI-9871 Hardware Overview The NI-9871 has four independent RS485/RS422 ports that are isolated from the other modules in the system. Each port is fully compatible with the ANSI/EIA/ TIA-485 standard. Sleep Mode (CompactRIO Only) You can enable sleep mode for the CompactRIO system in software. -
Page 4: Wiring The Ni-9871
TXD- Wiring the NI-9871 You must connect an external power supply to the NI-9871. This power supply provides the power for the RS485/RS422 transceivers on the module. You can use the included female four-position pigtail to connect to an external voltage source. - Page 5 2. V sup 3. COM 4. COM Figure 2 shows the method of power connection to the NI-9871 module. Attach an isolated power supply to the V and COM terminals using the included pigtail. Figure 2. Powering the NI-9871 from an Isolated Power Source Figure 3 shows how to use the optional Y-adapter (available at ni.com/serial) to...
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Page 6: Rs485 Bus Topology And Termination
NI-9871 Getting Started Figure 3. Powering Multiple Modules from a Single Power Supply RS485 Bus Topology and Termination Refer to Figure 4 and Figure 5 for an overview of 4-wire and 2-wire RS485 bus topologies and termination. Figure 4. 4-Wire Full-Duplex Multidrop Network Using Terminating Resistors Figure 5. -
Page 7: Conformal Coating
DTR/No Echo Auto DTR# Conformal Coating The NI-9871 is available with conformal coating for additional protection in corrosive and condensing environments, including environments with molds and dust. In addition to the environmental specifications listed in the NI-9871 Safety, Environmental, and Regulatory Information, the NI-9871 with conformal coating meets the following specification for the device temperature range.