Product Description

NI-9870: 4-Port, RS232 C Series Serial Interface Module

NI-9871: 4-Port, RS485/RS422 C Series Serial Interface Module

Physical Characteristics

Weight

NI-9870 with RJ50

154 g (5.4 oz)

NI-9871 with RJ50

153 g (5.4 oz)

Dimensions

Visit ni.com/dimensions and search by module number.

Connector type

NI-9870

4 RS232 (TIA/EIA-232) serial ports

NI-9871

4 RS485/RS422 serial ports

Environmental

Temperature

Operating

-40 °C to 70 °C

Storage

-40 °C to 85 °C

Ingress protection

IP30

Humidity

Operating

10% RH to 90% RH, noncondensing

Storage

5% RH to 95% RH, noncondensing

Pollution Degree

2

Maximum altitude

5,000 m

Indoor use only.

Hazardous Locations

Explosive atmospheres rating

Ex ec IIC T4 Gc

CCC certificate number

2021312310000312

Safety Guidelines

Operate the product only as described in this document.

Caution This icon denotes a caution, which advises you to consult documentation where this symbol is marked.
Caution Do not operate this product in a manner not specified in this document. Product misuse can result in a hazard. You can compromise the safety protection built into the product if the product is damaged in any way. If the product is damaged, return it to NI for repair.

Safety Guidelines for Hazardous Locations

These products have been evaluated as Ex ec IIC T4 Gc equipment and are CCC certified. Each product is suitable for use within ambient temperatures of -40 °C ≤ Ta ≤ 70 °C in either nonhazardous locations or Zone 2 hazardous locations. If you are using the products in Gas Group IIC hazardous locations, you must use the device in an NI chassis that has been evaluated as Ex ec IIC T4 Gc equipment.

Follow these guidelines if you are installing the product in a potentially explosive environment. Not following these guidelines may result in serious injury or death.

Caution Do not disconnect I/O-side wires or connectors unless power has been switched off or the area is known to be nonhazardous.
Caution Do not remove modules unless power has been switched off or the area is known to be nonhazardous.
Caution Substitution of components may impair suitability for Zone 2.
Caution Transient protection shall be provided that is set at a level not exceeding 140% of the peak rated voltage value of 85 V at the supply terminals to the equipment.
Caution The system shall only be used in an area of not more than Pollution Degree 2, as defined in IEC/EN 60664-1.
Caution The system shall be mounted in a CCC-certified enclosure with a minimum ingress protection rating of at least IP54 as defined in GB/T3836.1.
Caution The enclosure must have a door or cover accessible only by the use of a tool.

Safety Voltages

NI-9870

Connect only voltages that are within the following limits:

Maximum voltage

RS232 Receive Signal-to-COM (RXD, CTS, DSR, DCD, RI)

±25 V maximum, Measurement Category I

RS232 Transmit Signal-to-COM (TX, RTS, DTR)

±13.2 V maximum, Measurement Category I

Vsup-to-COM

±28 V maximum, Measurement Category I

Isolation voltages, Port-to-earth ground

Continuous

60 V DC, Measurement Category I

Withstand

Up to 2,000 m in altitude

1,000 V RMS verified by a 5 s dielectric withstand test

Up to 5,000 m in altitude

500 V RMS verified by a 5 s dielectric withstand test

Caution Do not connect the product to signals or use for measurements within Measurement Categories II, III, or IV.

NI-9871

Connect only voltages that are within the following limits:

Maximum voltage

RS485/RS422 Port-to-COM

-8 V DC to +13 V DC maximum, Measurement Category I

Vsup-to-COM

±28 V maximum, Measurement Category I

Isolation voltages, Port-to-earth ground

Continuous

60 V DC, Measurement Category I

Withstand

Up to 2,000 m in altitude

1,000 V RMS verified by a 5 s dielectric withstand test

Up to 5,000 m in altitude

500 V RMS verified by a 5 s dielectric withstand test

Caution Do not connect the product to signals or use for measurements within Measurement Categories II, III, or IV.

Installing C Series Modules

Verify that power is not connected to the I/O connector(s) on the C Series module.

Removing C Series Modules

Verify that power is not connected to the I/O connector(s) on the C Series module before you remove a module from the chassis.

Safety Compliance and Hazardous Locations Standards

This product is designed to meet the requirements of the following electrical equipment safety standards for measurement, control, and laboratory use:

  • IEC 61010-1
  • IEC 60079-0, IEC 60079-7
  • GB/T3836.1, GB/T3836.3
Note For safety certifications, refer to the product label or the Product Certifications and Declarations section.

Product Certifications and Declarations

To obtain product certifications and the DoC for NI products, visit ni.com/product-certifications, search by model number, and click the appropriate link.

Worldwide Support and Services

NI corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas, 78759-3504, USA.