1、BRITISH STANDARD BS ISO 11786:1995 Implementation of ISO 11786:1995 Agricultural tractors and machinery Tractor mounted sensor interface Specification ICS 65.020.10BSISO 11786:1995 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published underthe a
2、uthority of the Standards Board and comes into effect on 15 December 1995 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference AGE/31 Draft for comment 93/712650 DC ISBN 0 580 24989 1 Committees responsible for this British Standard The preparation of thi
3、s British Standard was entrusted to Technical Committee AGE/31, Agricultural electronic equipment, upon which the following bodies were represented: Agricultural Engineers Association Forestry Commission Health and Safety Executive Milk Marketing Board Ministry of Agriculture, Fisheries and Food Nat
4、ional Farmers Union Silsoe College, Cranfield Institute of Technology Silsoe Research Institute Amendments issued since publication Amd. No. Date CommentsBSISO11786:1995 BSI 11-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword iii Text of ISO 11786 1BSISO 1
5、1786:1995 ii BSI 11-1999 National foreword This British Standard reproduces verbatim ISO 11786:1995 and implements it as the UK national standard. This British Standard is published under the direction of the Engineering Sector Board whose Technical Committee AGE/31 has the responsibility to: aid en
6、quirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. NOTEInternational and European Standards
7、, as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Br
8、itish Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO title page, pagesii to iv, pages 1 to 3 and a back cover. This standard has been updated (see copyright date) and may have h
9、ad amendments incorporated. This will be indicated in the amendment table on the inside front cover.ISO11786:1995(E) ii BSI 11-1999 Contents Page Foreword iii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Connector 1 5 Data signals 3 6 Power supply 3 Figure 1 Seven-pin connector dimensions 2I
10、SO11786:1995(E) BSI 11-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body inter
11、ested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
12、 Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Int
13、ernational Standard ISO 11786 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, SubcommitteeSC 19, Agricultural electronics.iv blankISO11786:1995(E) BSI 11-1999 1 1 Scope This International Standard specifies an electrical connector and its pin layou
14、t for mounting on an agricultural tractor with a nominal 12-volt battery supply for the purpose of providing an interface between tractor-mounted sensors and equipment requiring signals from those sensors. The connector also provides access to a low-current power source, to provide power primarily t
15、o instrumentation. This International Standard therefore provides a short-term solution to data communication between a restricted set of tractor-mounted sensors and other equipment such as monitors, actuators and control systems on agricultural tractors and attached machinery, in anticipation of th
16、e availability of a standardized digital data bus system. It allows limited data communication facilities for lower specification tractors not fitted with a digital data bus system. 2 Normative references The following standards contain provisions which, through reference in this text, constitute pr
17、ovisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the stan
18、dards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. DIN 405-1:1975, Knuckle thread: profiles, basic sizes, general plan. DIN 405-2:1981, Knuckle thread: deviations and tolerances. 3 Definitions For the purposes of this International Standard,
19、the following definitions apply. 3.1 ground speed signal actual forward speed of the tractor 3.2 theoretical ground speed signal product of tractor drive wheel rotational speed and the rolling wheel circumference NOTE 1This is the true ground speed where there is no wheel slip. The rolling circumfer
20、ence is defined in ISO 11795, Agricultural tractor drive wheel tyres Methods of measuring tyre rolling circumference. 3.3 linkage position signal position of the tractor three-point linkage in the vertical plane between its lowest and highest points 3.4 in-work/out-of-work signal binary status signa
21、l indicating that the three-point linkage is situated below (in-work) or above (out-of-work) an adjustable switching threshold 3.5 CMOS Complementary Metal-Oxide Semiconductor 4 Connector 4.1 Dimensions The connector shall have the dimensions shown in Figure 1. 4.2 Pin allocation A seven-pin female
22、bulkhead connector shall be mounted on the tractor with the following pin allocation: Pin 1: true ground speed Pin 2: theoretical ground speed Pin 3: rear PTO rotational speed Pin 4: rear three-point implement in-work/out-of-work Pin 5: rear three-point linkage position Pin 6: power supply Pin 7: co
23、mmon ground Tractor designers may, at their discretion, connect any or none of the pins to the appropriate sources. The pin allocation shall not be changed. 4.3 Specification of connector 4.3.1 The female bulkhead connector shall contain seven pins in a polarized shell in accordance with Figure 1. P
24、ins 6 and 7 shall have a minimum current-carrying capacity of 5A. The pins shall be plated to minimize contact resistance. The connector shall withstand a minimum of400connect/disconnect cycles without deterioration in performance.ISO11786:1995(E) 2 BSI 11-1999 Figure 1 Seven-pin connector dimension
25、sISO11786:1995(E) BSI 11-1999 3 4.3.2 As the position of the connection is not specified in this International Standard, environmental proofing is not specified. It is recommended that designers give consideration to the following connector features: moisture sealing, closures for when connector is
26、not in use, locking rings, breakaway. NOTE 2The physical connector specification is met by the Amphenol C16-1 connector. Amphenol is a trade-name. This information is given for the convenience of users of this International Standard and does not constitute an endorsement by ISO of the product named.
27、 Equivalent products may be used if they can be shown to lead to the same results. 4.4 Location of connector The connector shall be located within the tractor cab. The designer shall give due consideration to the location when determining environmental proofing of the connector. Additional, environm
28、entally proofed seven-pin female connectors may be mounted outside the tractor cab. 5 Data signals 5.1 Signal characteristics The signal characteristics for true and theoretical ground speed, PTO rotational speed and linkage are so specified as to be compatible with CMOS logic as defined in JEDEC 1)
29、 , powered from the tractor battery with a minimum voltage of 10 V. 5.2 True ground speed and theoretical groundspeed 5.2.1 The signal shall be a square wave with a duty cycle between 20 % and 80 %, and with rise and fall times less than 1 ms. 5.2.2 The signal level of the square wave “mark” (high)
30、shall be greater than 6,3 V and the “space” (low) shall be less than 1,5 V. The output source impedance at “space” (low) shall be 100 7 10 7. The load impedance shall be greater than 3 k7. 5.2.3 At speeds greater than 1 km/h, the speed shall be represented by 130 pulses/m 5 % (130 Hz/m/s 5 %) in a s
31、tandard calibration test. 5.3 PTO rotational speed 5.3.1 The signal shall be a square wave with a duty cycle between 20 % and 80 %, and with rise and fall times less than 1 ms. 5.3.2 The signal level of the square wave “mark” (high) shall be greater than 6,3 V and the “space” (low) shall be less tha
32、n 1,5 V. The output source at “space” (low) shall be 100 7 10 7. The load impedance shall be greater than 3 k7. 5.3.3 At rotational speeds greater than 2 r/s, the speed shall be represented by 6 pulses per revolution (6 Hz/r/s). 5.4 In-work/out-of-work The in-work signal shall be represented by a vo
33、ltage less than 1,5 V and the out-of-work signal by a voltage greater than 6,3 V. The output source impedance at the in-work position shall be 100 7 10 7. The load impedance shall be greater than 3 k7. NOTE 3Leading and trailing edges of the linkage up/down signal may be corrupted by switch bounce.
34、5.5 Linkage position The signal voltage varies linearly corresponding to the height of the linkage position. The signal shall be 0 V representing the lowest position and 10 V representing the highest position. The load impedance shall be greater than 3 k7. 6 Power supply Power shall be supplied to p
35、in 6 from the tractor battery via the ignition switch. The maximum current drawn from pin 6 shall be 5 A. The supply shall be fused at 10 A. 1) Joint Electron Devices Engineering Council of the Electronic Industries Association, U.S.A.: Standard 13B, Standard specifications for description of B-seri
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