RS-485的接口信号电平比RS-232-C降低了，就不易损坏接口电路的芯片， 且该电平与TTL电平兼容，可方便与TTL 电路连接。
        RS-485的数据最高传输速率为10Mbps。RS-485接口是采用平衡驱动器和差分接收器的组合，抗共模干扰能力增强，即抗噪声干扰性好。
        RS-485最大的通信距离约为1219M，最大传输速率为10Mb/S，传输速率与传输距离成反比，在100Kb/S的传输速率下，才可以达到最大的通信距离，如果需传输更长的距离，需要加485中继器。
        RS-485总线一般最大支持32个节点，如果使用特制的485芯片，可以达到128个或者256个节点，最大的可以支持到400个节点。

General Description:

24 AWG stranded (7x32) TC conductors, polyethylene insulation, twisted pairs, overall Beldfoil. (100% coverage) + TC braid shield (90% coverage), 24 AWG stranded TC drain wire, PVC jacket.

 

Physical Characteristics (Overall)

Conductor

AWG:

# Pairs    AWG    Stranding    Conductor Material

1             24        7x32            TC - Tinned Copper

Total Number of Conductors:                             2

 

Insulation

Insulation Material:

Insulation Material          Wall Thickness (in.)

PE - Polyethylene            0.023

 

Outer Shield

Outer Shield Material:

Layer #    Outer Shield Trade Name   Type    Outer Shield Material                   Coverage (%)

1             Beldfoil. (w/ shorting fold)     Tape    Aluminum Foil-Polyester Tape    100.000

2                                                          Braid    TC - Tinned Copper                    90.000

 

Outer Shield Drain Wire AWG:

AWG    Stranding    Drain Wire Conductor Material

24        7x#32         TC - Tinned Copper

 

Outer Jacket

Outer Jacket Material:

Outer Jacket Material           Nom. Wall Thickness (in.)

PVC - Polyvinyl Chloride      0.035

 

Overall Cable

Overall Cabling Fillers:      Fibrous Polypropylene

Overall Cabling Lay Length & Direction:

Length (in.)   Direction         Twists (twist/ft)

2.500            Left Hand        4.800

Overall Nominal Diameter:  0.232 in.

 

Pair

Pair Color Code Chart:

Color

White/Blue and Blue/White

 

Mechanical Characteristics (Overall)

Operating Temperature Range:                -30°C To +90°C

UL Temperature Rating:                           80°C (UL AWM Style 2919)

Bulk Cable Weight:                                    36 lbs/1000 ft.

Max. Recommended Pulling Tension:       72.300 lbs.

Min. Bend Radius/Minor Axis:                   2.500 in.

 

Applicable Specifications and Agency Compliance (Overall)

Applicable Standards & Environmental Programs

NEC/(UL) Specification:                              CM

NEC Articles:                                               800

CEC/C(UL) Specification:                            CM

AWM Specification:                                      UL Style 2919 (30 V 80°C)

EU Directive 2011/65/EU (ROHS II):            Yes

EU CE Mark:                                                Yes

EU Directive 2000/53/EC (ELV):                  Yes

EU Directive 2002/95/EC (RoHS):                Yes

EU RoHS Compliance Date (mm/dd/yyyy):   01/01/2004

EU Directive 2002/96/EC (WEEE):               Yes

EU Directive 2003/11/EC (BFR):                  Yes

CA Prop 65 (CJ for Wire & Cable):              Yes

MII Order #39 (China RoHS):                      Yes

 

Flame Test

UL Flame Test:                          UL1685 UL Loading

CSA Flame Test:                        FT1

 

Suitability

Suitability - Indoor:                     Yes

 

Plenum/Non-Plenum

Plenum (Y/N):                            No

Plenum Number:                       82841, 89841

 

Electrical Characteristics (Overall)

Nom. Characteristic Impedance:

Impedance (Ohm)

120

 

Nom. Capacitance Conductor to Conductor:

Capacitance (pF/ft)

12.8

 

Nom. Capacitance Cond. to Other Conductor & Shield:

Capacitance (pF/ft)

23

 

Nominal Velocity of Propagation:

VP (%)

66

 

Nominal Delay:

Delay (ns/ft)

1.6

 

Nom. Conductor DC Resistance:

DCR @ 20°C (Ohm/1000 ft)

24

 

Nominal Outer Shield DC Resistance:

DCR @ 20°C (Ohm/1000 ft)

3.4

 

Nom. Attenuation:

Freq. (MHz) Attenuation (dB/100 ft.)

1.000 0.600

 

Max. Operating Voltage - UL:

Voltage Description

300 V RMS Type CM

30 V RMS AWM2919

 

Max. Recommended Current:

Description Current

10C temperature rise 2.1 Amps per conductor @ 25°C ambient

 

Put Ups and Colors:

Item #                  Putup        Ship Weight    Color           Notes     Item Desc

9841 060100      100 FT       4.300 LB        CHROME                  1 PR #24 PE SH PVC

9841 0601000    1,000 FT    40.000 LB      CHROME     C          1 PR #24 PE SH PVC

9841 06010000  10,000 FT  380.000 LB    CHROME     C          1 PR #24 PE SH PVC

9841 060500      500 FT       20.000 LB      CHROME     C          1 PR #24 PE SH PVC

9841 0605000    5,000 FT    200.000 LB    CHROME                 1 PR #24 PE SH PVC

Notes:

C = CRATE REEL PUT-UP.