National Instruments 9871 Getting Started Download Page 13 | Manualshive

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National Instruments 9871 Getting Started Download Page 13

Figure 4. 4-Wire Full-Duplex Multidrop Network

Using Terminating Resistors

MASTER

Slave 1

120

Ω

Slave 2

Slave n

120

Ω

Tx

Tx

Rx

Tx

Rx

Tx

Rx

Rx

120

Ω

120

Ω

Figure 5. 2-Wire Multidrop Network Using Terminating Resistors

MASTER

Slave 1

120

Ω

Slave 2

Slave n

120

Ω

Tx

Tx

Rx

Tx

Rx

Tx

Rx

Rx

The driver directly supports 4-wire full-duplex operation on peer-
to-peer RS-485 networks. Multidrop RS-485 networks require
additional software development.

RS485 terminators are available at

ni.com/serial

.

NI 9871 Getting Started Guide

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© National Instruments

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Summary of Contents for 9871

Page 1: ...GETTING STARTED GUIDE NI 9871 4 Port RS485 RS422 Serial Module Français Deutsch 日本語 한국어 简体中文 ni com manuals ...

Page 2: ...t not meet the same safety ratings Refer to the documentation for each component in the system to determine the safety and EMC ratings for the entire system Safety Guidelines Operate the NI 9871 only as described in this document Hot Surface This icon denotes that the component may be hot Touching this component may result in bodily injury Caution Do not operate the NI 9871 in a manner not specifi...

Page 3: ...cations and nonhazardous locations only Follow these guidelines if you are installing the NI 9871 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...

Page 4: ...2 applications install a protection device between the external power supply and the NI 9871 Vsup and COM pins The device must prevent the Vsup to COM voltage from exceeding 39 V if there is a transient overvoltage condition Special Conditions for Hazardous Locations Use in Europe and Internationally The NI 9871 has been evaluated as Ex nA IIC T4 Gc equipment under DEMKO Certificate No 07 ATEX 062...

Page 5: ... system shall be mounted in an ATEX IECEx certified enclosure with a minimum ingress protection rating of at least IP54 as defined in IEC EN 60079 15 Caution The enclosure must have a door or cover accessible only by the use of a tool Special Conditions for Marine Applications Some products are Lloyd s Register LR Type Approved for marine shipboard applications To verify Lloyd s Register certifica...

Page 6: ...tered power and input output ports In addition take precautions when designing selecting and installing measurement probes and cables to ensure that the desired EMC performance is attained Wiring the NI 9871 The NI 9871 has four RJ 50 receptacles that provide connections for four RS485 RS422 devices 6 ni com NI 9871 Getting Started Guide ...

Page 7: ...50 Jack NC TXD TXD RTS CTS RXD RXD RTS CTS COM 1 2 3 4 5 6 7 8 9 10 1 No Connect 2 TXD 3 TXD 4 RTS 5 CTS 6 RXD 7 RXD 8 RTS 9 CTS 10 GND These signals are shared by all four RJ 50 connectors on the NI 9871 NI 9871 Getting Started Guide National Instruments 7 ...

Page 8: ... standard NI pinout on a DB 9 male connector as shown in Table 2 Table 2 Pin Assignments for RS485 RS422 DB 9 Male Connector Connector RJ 50 Pin Signal Name 6 7 8 9 1 2 3 4 5 1 GND 2 CTS 3 RTS 4 RXD 5 RXD 6 CTS 7 RTS 8 TXD 9 TXD 8 ni com NI 9871 Getting Started Guide ...

Page 9: ...rce Figure 1 lists the connections between an external voltage source of 8 V to 28 V and the NI 9871 Caution To ensure the specified EMC performance do not connect the power input to a DC mains supply or to any supply requiring a connecting cable longer than 30 m 100 ft A DC mains supply is a local DC electricity supply network in the infrastructure of a certain site or building NI 9871 Getting St...

Page 10: ...Connector 1 3 4 2 1 VSUP 2 VSUP 3 COM 4 COM Figure 2 shows the method of power connection to the NI 9871 module Attach an isolated power supply to the VSUP and COM terminals using the included pigtail 10 ni com NI 9871 Getting Started Guide ...

Page 11: ...o use the optional Y adapter available at ni com serial to connect power to more than one module using the same power source One Y adapter is needed for each additional module Ensure that the power supply can handle maximum power requirements for all modules connected Caution Make all connections before applying power NI 9871 Getting Started Guide National Instruments 11 ...

Page 12: ...XX Male Microfit Y Adapter NI P N 198159 XX Female Microfit Pigtail V V Any 8 to 28 V Isolated 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 12 ni com NI 9871 Getting Started Guide ...

Page 13: ...Multidrop Network Using Terminating Resistors MASTER Slave 1 120 Ω Slave 2 Slave n 120 Ω Tx Tx Rx Tx Rx Tx Rx Rx The driver directly supports 4 wire full duplex operation on peer to peer RS 485 networks Multidrop RS 485 networks require additional software development RS485 terminators are available at ni com serial NI 9871 Getting Started Guide National Instruments 13 ...

Page 14: ...ansceiver Control Pin Conditions Enable 4 Wire 2 Wire DTR Echo DTR No Echo Auto TX On DTR DTR TX RX On On DTR TX 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 14 ni com NI 9871 Getting Started Guide ...

Page 15: ...you cannot communicate with the modules Refer to the Specifications section for more information about power consumption and thermal dissipation Specifications The following specifications are typical for the range 40 C to 70 C unless otherwise noted Maximum baud rate 3 6864 Mbps Maximum module throughput 1 28 Mbps Maximum cable length 1 2 km 4 000 ft NI 9871 Getting Started Guide National Instrum...

Page 16: ... NI for Bellcore MTBF specifications at other temperatures or MIL HDBK 217F specifications Power Requirements Power consumption from chassis Active mode 0 5 W max Sleep mode 50 µW max Thermal dissipation at 70 C Active mode 1 5 W max Sleep mode 55 W max Required external supply voltage range VSUP 8 to 28 VDC 16 ni com NI 9871 Getting Started Guide ...

Page 17: ...eight Approx 153 g 5 4 oz Safety Maximum Voltage1 Connect only the voltages that are within these limits RS485 RS422 Port to COM 8 to 13 VDC max Measurement Category I VSUP to COM 28 V max Measurement Category I 1 The maximum voltage that can be applied or output without creating a safety hazard NI 9871 Getting Started Guide National Instruments 17 ...

Page 18: ...oltages from specially protected secondary circuits Such voltage measurements included signal levels special equipment limited energy parts of equipment circuits powered by regulated low voltage sources and electronics Caution Do not connect to signals or use for measurements within Measurement Categories II III or IV Isolation Voltages Port to earth ground Continuous 60 VDC Measurement Category I...

Page 19: ...ments of the following electrical equipment safety standards for measurement control and laboratory use IEC 61010 1 EN 61010 1 UL 61010 1 CSA 61010 1 EN 60079 0 2012 EN 60079 15 2010 IEC 60079 0 Ed 6 IEC 60079 15 Ed 4 UL 60079 0 Ed 5 UL 60079 15 Ed 3 CSA 60079 0 2011 CSA 60079 15 2012 Note For UL and other safety certifications refer to the product label or the Online Product Certification section...

Page 20: ...e 2 Ex nA IIC T4 Europe DEMKO Ex nA IIC T4 Gc Environmental Refer to the manual for the chassis you are using for more information about meeting these specifications Operating temperature IEC 60068 2 1 IEC 60068 2 2 40 C to 70 C Storage temperature IEC 60068 2 1 IEC 60068 2 2 40 C to 85 C Ingress protection IP 30 20 ni com NI 9871 Getting Started Guide ...

Page 21: ...0 m Indoor use only Shock and Vibration To meet these specifications you must panel mount the system Operating vibration Random IEC 60068 2 64 5 grms 10 Hz to 500 Hz Sinusoidal IEC 60068 2 6 5 g 10 Hz to 500 Hz Operating shock IEC 60068 2 27 30 g 11 ms half sine 50 g 3 ms half sine 18 shocks at 6 orientations NI 9871 Getting Started Guide National Instruments 21 ...

Page 22: ...ons Basic immunity EN 55011 CISPR 11 Group 1 Class A emissions AS NZS CISPR 11 Group 1 Class A emissions FCC 47 CFR Part 15B Class A emissions ICES 001 Class A emissions Note For the standards applied to assess the EMC of this product refer to the Online Product Certification section Note For EMC compliance operate this product according to the documentation 22 ni com NI 9871 Getting Started Guide...

Page 23: ...itional regulatory compliance information To obtain product certifications and the DoC for this product visit ni com certification search by model number or product line and click the appropriate link in the Certification column Environmental Management NI is committed to designing and manufacturing products in an environmentally responsible manner NI recognizes that eliminating certain hazardous ...

Page 24: ... Equipment WEEE EU Customers At the end of the product life cycle all NI products must be disposed of according to local laws and regulations For more information about how to recycle NI products in your region visit ni com environment weee 电子信息产品污染控制管理办法中国 RoHS 中国客户 National Instruments 符合中国电子信息产品中限制使用某些有害物质指令 RoHS 关于 National Instruments 中国 RoHS 合规性信息请登录 ni com environment rohs_china For inf...

Page 25: ...nal Instruments product Product registration facilitates technical support and ensures that you receive important information updates from NI A Declaration of Conformity DoC is our claim of compliance with the Council of the European Communities using the manufacturer s declaration of conformity This system affords the user protection for electromagnetic compatibility EMC and product safety You ca...

Page 26: ...ering NI products technology refer to the appropriate location Help Patents in your software the patents txt file on your media or the National Instruments Patent Notice at ni com patents You can find information about end user license agreements EULAs and third party legal notices in the readme file for your NI product Refer to the Export Compliance Information at ni com legal export compliance f...

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