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July 2025
NI-9871E Request for Availability
NI-9871E, 4-Port, RS-485/RS-422 Serial Module
Rated 4.7/5 | 7 ratings
Actual item may vary if no part number is provided on quote request.
✔ 2 Year Warranty Included
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Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
Carol Zimme**** Verified Buyer
" Very responsive and helpful, competitive pricing. Good source! "
July 2025
Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
National Instruments NI-9871E RS-485/RS-422 Serial Module
The NI 9871E (Part Number: 198851A-02L) is a 4-Port Serial Module; each port is separated from the other modules in the system. Every port is compatible with the ANSI/EIA/TIA-485 standard. This module also has four RJ-50 receptacles, which offer links for four RS-485/RS-422 instruments. The user must link an external power supply to the Serial Module. The power supply delivers the power for the RS-485/RS-422 transceivers on the NI-9871E Serial Module. The user can utilize a female four-position pigtail to link to an external voltage base. The four connections on the NI 9871E are named 1) VSUP, 2) VSUP, 3) COM, and 4) COM. The locations of these connections and figures illustrating how to make connections can be found in the user module. It is important for the user to remember that all connections must be completed prior to applying power.
The National Instruments NI-9871E RS-485/RS-422 Serial Module supports a low-power sleep mode. However, support for the sleep mode at the system level is based on the chassis the NI 9871E is inserted into. Normally, when a system is in sleep mode, it is not possible to communicate with the modules. During sleep mode, the system consumes the least amount of power possible and may disperse a smaller amount of heat than in the normal mode of operation. The power consumption is 0.5 W maximum in active mode and 50 μW maximum in sleep mode. In addition, the thermal dissipation at 70 degrees C is 1.5 W maximum in active mode and 55 mW maximum in sleep mode.
NI-9871E Obsolete Status has been announced by National Instruments, but will still be available for purchase and repairs by Apex Waves.
| Model | NI-9871E |
|---|---|
| Manufacturer | National Instruments |
| Part Number | 198851A-02L |
| Type | RS-485/RS-422 Serial Module |
| Ports | 4 |
| Connectors | RJ-50 |
| Maximum Cable Length | 4,000 ft. |
| Weight | 1.9 oz. |
| Warranty | Three Year Warranty |
| NI-9871E Manual | User Manual and Maintenance Manual Available for Download |
| Price | Contact a sales representative for a quote. |
Associated part numbers for NI-9871E:
National Instruments NI-9871E Frequently Asked Questions
Question: What is the maximum baud rate of the NI-9871E?
Answer: The NI-9871E has a maximum baud rate of 3.6864 Mbps.
Question: What is the date line ESD protection (human body model) for the NI 9871E?
Answer: The data line ESD protection (human body model) for the NI 9871E is ±15 kV.
Question: What is the necessary external supply voltage range for the NI-9871E?
Answer: The NI-9871E has a necessary external supply voltage range of +8 to +28 VDC.
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