Design and Realization of Measurement System for Underwater Equipments Hao Wang

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1 3d Intntinl Cnfnc n Mchiny, Mtils nd Infmtin Tchnlgy Applictins (ICMMITA 2015) Dsign nd Rliztin f Msmnt Systm f Undwt Eqipmnts H Wng Dlin Scintific Tst & Cntl Tchnlgy Institt, Dlin ,Chin mil:imwh19@163.cm Cspnding th:wngh Kywds: Undwt Eqipmnt; Sns; Mniting; CAN Bs. Abstct. Undwt qipmnt xiliy mniting is th imptnt pmis t ns systm wk nmlly nd ffcti dt nlysis. This systm gi fll cnsidtin t th tpt fm f ll kinds f snss nd liz th nt ccss f diffnt kinds f xiliy msing mdl by sing ntwk bs nd CAN bs. This pp cmpltd th stct dsign f th xiliy msing systm, th intfc cicit dsign f th CAN bs nd th ntwk ccss pttns f ll kinds f snss, lizd nd ifid th xiliy msing systm f ndwt qipmnts which cn mnit th imptnt xiliy infmtin. Intdctin With incsing ttntin f th stt t th cn xpltin, diffnt ndwt qipmnts h dlpd qickly in cnt ys. Dmnd f ndwt qipmnts t ms ndwt xiliy infmtin is incsing. With scl xpnsin nd cmplictin f ndwt qipmnts, singl-pint xiliy infmtin msmnt cn nt mt th systm qimnts. F lg-scl nd distibtd ndwt qipmnt, it is y ncssy t dsign mlti-chnnl ndwt xiliy msmnt infmtin cllctin systm. Th ndwt qipmnts minly fcs n xiliy msmnt pmts, inclding ndwt tmpt, dpth, pst f ndwt qipmnt, cnt, -ht, -ltg nd wt lkg lm. Bsd n th b cnsidtin, this pp dsigns th ndwt qipmnt msmnt systm t cllct diffnt ndwt xiliy msmnt infmtin t dpt is signl tpt pttns f ndwt snss. Ntwk stct f xiliy msmnt systm Th xiliy msmnt systm cnncts th systm pts i th ntwk nd cllcts dt f xiliy msmnt mdls f th stt mniting mdls sch s tmpt, dpth, pst nd wt lkg. Th lgic stct f th systm ntwk is shwn s th fig 1: LAN t RS485 ( ) Stt mnitin g cmpt Nt w k swit ch LAN t CAN ( ) LAN t 232 ( ) Onsh:RS485 cntl bs Sbs: CAN cntl bs Sbs Tmpt, dpth nd wt lkg f sbs Pst sns Ocnt, ht nd ltg lm signls Fig1 xiliy mniting systm ntwk stct Th systm minly cllcts dt, inclding wt lkg mniting dt f ndwt msmnt lctnic cbin, tmpt nd dpth dt f nds dic, pst dt f Th ths - Pblishd by Atlntis Pss 215

2 nds dic, nd ptin stt mniting dt f diffnt mplifis. Th ndwt ci is mt fm th bwt systm, s ptic fib is sd t mtly tnsmit infmtin nd dc cnsmptin n th cbl. Th bwt systms nd ndwt cis cnnctd i th LAN pticl tminl nd ptic fib. Th ntwk lctic signls f TCP/IP ptcl std in th ndwt ci by sing th ntwk switch with ptic fib intfc. Th ndwt pt inclds mltipl sctins nd ch sctin inclds mny dt t cllct. If tin cmmnictin tchnlgy is sd, lg nmb f cbls will b sd, which will mk th whl systm m cmplictd. Th xiliy msmnt systm ss CAN bs cmmnictin tchnlgy. CAN is n mlti-mst p fild bs cmmnictin systm, which cnncts fild dics s cntl ntwk t xchng infmtin with ch th i th bs nd is tw-wy sil mlti-nd digitl cmmnictin systm. CAN will snd nd ci dt mng nds by sing tw shilding twistd pi cbls bsd n th cmmnictin dt cding. Th CAN bs nt nly dcs ccpid ndwt cbls, bt ls simplifis th systm nd imps systm libility. T cllct s f ndwt dics by sing CAN bs, th intfc cicit f CAN bs is dsignd. Th CAN bs intfc is cmpsd f mic cntl nits (MCU), CAN bs cntll nd CAN bs tnsci. Th MCU initilizs CAN cntll nd cntls dt ciing/snding. SJA1000 fm Philips is sd s th CAN bs cntll, which cn cmplt fnctins f physicl ly nd dt link ly in CAN bs cmmnictin ptcl nd pid th physicl lin intfc t MUC. SJA1000 cn cmplt dt tnsmissin cding nd dcding lgic, bt CAN bs tnsci shld b ddd btwn it nd physicl bs t incs th diffntil ciing/tnsmissin cpbility f th systm. PCA82C250 is sd s th CAN bs tnsci, which is xtnsily sd in th wld, cn gnt diffntil ltg f nml ptin f CAN bs, ct s th intfc btwn th CAN ptcl cntll nd physicl bs, pid diffntil tnsmissin cpbility t th bs, ff diffntil ciing cpbility t CAN cntll. T fth nhnc nti-distbnc cpbility f th CAN bs nd, th high-spd light cpl 6N137 is sd btwn th CAN bs cntll nd tnsci f lctic isltin f diffnt nds in CAN bs. Th cicit pincipl digm f CAN bs intfc is shwn s th fig 2. STC89C52 P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 P2.7 RD WR INT0 ALE SJA1000 AD0 TX0 AD1 AD2 AD3 RX0 AD4 AD5 RX1 AD6 AD7 VDD1 CS VDD2 RD VDD3 WR MODE INT VSS1 ALE VSS2 VSS3 6N137 IN EN VDD OUT GND 6N137 GND OUT VDD EN IN VDD PCA82C250 TXD CANH CANL Rs RXD Fig2 CAN bs intfc cicit schmtic digm Th snss with nlg tpt cn b cnnctd t th ntwk by cmbining th CAN bs cllctin mdl with th CAN-LAN tnsfmtin mdl. bsd n ADS8401 is cnnctd t th CAN bs intfc nd cn cllct th nlg tpt dt f ndwt snss i CAN bs. Th dt will b pldd t th stt mniting cmpt i LAN-CAN cnt nd th cntl instctins f th mniting cmpts will b tnsfmd t CAN bs i LAN-CAN tnsfm nd thn b snt t ndwt cllctin nits. Th ndwt cllctin nits will cllct, tmint cllctin nd pld dt ccding t th instctins fm th pp dic. Snss, which tpt dt i RS232, cnnctd t th ntwk by sing LAN-232 cnt. Th LAN-232 cnt cn cnt th cntl cllctin instctins f th mniting cmpt int RS232. Th sns nit is cnnctd t this RS232 intfc nd cspnding ctins pfmd ccding t th instctins fm RS232 intfc. Th cllctd dt is R T R T 216

3 pldd t th stt mniting cmpt. If th snss tpt TTL ll signls, th xiliy msmnt systm cnncts th nits i RS485 bs. Th nit is cnnctd t RS484 intfc. Th tpt ll signls t cllct cnnctd t th spcifid chnnl f th spcifid nit. With RS485 bs, th pp mniting cmpt ds th inpt tminl stts f nits t mnit ths signls. Ntwk cnnctin f snss Tmpt nd dpth cllctin mdl. Th CYW-007 tmpt nd dpth sns mss th pss by sing th diffsing silicn pss snsiti cmpnnts nd intgtd cicits. Th pltinm sist nd intgtd cicit mss th tmpt. Th shll is dsignd s th flly stinlss wtpf stct nd fts smll lm, high pcisin nd gd stbility, s it is sitbl f th tmpt nd dpth cllctin f ndwt qipmnt. Its dpth msmnt ng cn ch 100m nd th pcisin is 0.5%. Th tmpt msmnt ng is 0-50 nd th pcisin is 0.5. Th dpth nd tmpt tpt signls 4-20mA cnt signls. Aft 250Ω smpling sist is cnnctd, th smpling sist cn gt 1-5V ltg tpt signls in ctl ptin. Whn th tmpt nd dpth dt is cllctd, th smpld ltg signls cnnctd t. Th cllctd dt is snt t th stt mniting cmpt i th ntwk. Ths stts cn b cllctd t knw th tmpt nd dpth infmtin dt f th ndwt ci in tim. Th stct fmwk f th tmpt nd dpth cllctin nit is shwn s th fig 3. 24V Pw Tmpt Dpth 电 CYW-007 型温深传感器温度深度 250Ω 250Ω AI 单元 Fig3 Tmpt nd dpth f cqisitin nit Pst cllctin mdl. HMR3000 pst sns is th digitl Cmpss mdl f Hnywll, which pids th zimth infmtin i th mgntic sistnc sns nd tw-shft inclintin sns nd fts lw pic nd cnnint pchs. This sns lizs dt cmmnictin by sing RS232 intfc, s it cn nt tpt nlg ls nd cn nt b cnnctd t CAN bs. Only th nst fist ndwt lctnic cbin fm th sh qipmnt is instlld with this sns. Whn this sns is sd f pst cllctin, LAN-RS232 cnt is sd. Its RS232 nd is cnnctd with HMR3000 pst sns. Anth nd is cnnctd with LAN. With this cnnctin md, th mniting cmpt cn cllct dt fm HMR3000 pst sns i LAN ntwk. 3DM-HD pst sns is sd t cllct th pst dt in th ndwt cis. 3DM-HD tpts nlg ls. F this fm, LAN-CAN cnt is sd t cnnct th 3DM-HD ntwk. Th sns signls cnnctd t th insid th ndwt sling lctnic cbin. With LAN-CAN cnt, th cntl cllctin instctin f th mniting cmpt is cntd t CAN bs. Th nlg inpt nit (AI) is cnnctd t th CAN bs intfc. Th cllctd dt is pldd t th stt mniting cmpt ccding t th instctin ctins fm CAN bs intfc. Wt lkg mniting mdl. Th wt lkg indctin lin f th wt lkg mniting nit sns inclds tw plll lds, which pckd int th wt-bspti insltin mtils. Tw lds insltd nd nml stt nd th sistnc btwn tw lds is y high. Whn wt lks, th sistnc f th wt-bspti insltin mtils will dclin qickly d t wt bsptin, s th sistnc btwn tw lds will dc. Th wt lkg cn b dtctd i dtcting chng f sistnc btwn tw lds. Onc wt sking is dtctd, n lm is gin nd th lm ll signl is tpttd. Th pp dic systm will cllct lms. Th wt lkg mniting nit dtcts wt lkg i th cmp LM2903. Th AI 单元 217

4 LM2903 is lw-ffst ltg pcis cmp nd inclds tw indpndnt cmp nits. Th chip cn pt within 2V-36V wid ltg. Th ng f th diffntil inpt ltg cn ch th pw ltg. Th chip tpts i OC. A pp p pll sist cn b cnnctd t th tpt nd n dmnd. T dtct th sistnc chng f th wt lkg indctin lin, big sist nd wt lkg indctin lins sd t cmps ltg diisin cicit. Th diidd ltg is cnnctd t - inpt nd f th cmp. Th + inpt nd f th cmp is cnnctd t th ltg diisin ntwk. On fdbck sist is sd t cmps smll-mplitd hystsis ltg. Th sist f th wt lkg indctin lin is y high nd nml stt, s th ltg is y smll ft ltg diisin nd high ll is tpttd. Whn wt lks, th sistnc f th wt-bspti insltin ct f th wt lkg indctin lin will qickly dc t wt bsptin. Th diidd ltg will bcm high thn th + nd ltg f th cmp nd th cmp tpts th lw ll. Aft this lw ll is cllctd by f th CAN bs, th xiliy msmnt systm will gi th wt lkg lm signl. Ocnt, ht nd ltg lm mdl. Th ffsh qipmnt cn gi cnt, ht nd ltg lm. Th mniting pt f th lm signl is shwn s th fig 4: l t c g h Sctin 1 n m lt O m l O O l l t Sctin 2 c g h n m lt O m l O O l l t Sctin n c g h n m lt O m l O O l Mniting PC TCP/IP LAN-485 RS485 Fig4 lm mniting nit Ths qipmnt will tpt TTL ll signls s stt indictin signls. Mltipl nits cnnctd t RS485 intfc will cllct ths signls nd snd th cllctd infmtin t th mniting cmpt i th ntwk. Ths stts cllctd t knw th cnt ptin stt f th dic nd ns nml ptin. Systm Vifictin Th pfmnc f th ndwt xiliy msmnt systm is ifid by sing th cn tst. Th xiliy msmnt systm cntinsly pids xiliy msmnt dt t th stt mniting cmpt in th tst. Th tmpt, dpth nd pst dt f th systm stbl nd th tmpt nd dpths f diffnt qipmnt kp gh cnsistnt. N wt lkg nd cnt ccs in tst. Th ndwt qipmnt pts stbly. Th systm s xiliy msmnt infmtin is shwn s th fig 5: 218

5 Fig5 xiliy msing infmtin disply intfc Cnclsins This pp dsigns n xiliy msmnt systm sitbl f ndwt qipmnt bsd n th ntwk bs nd CAN bs ccding t tpt fms f diffnt sns mdls. Th systm cn cllct nd disply tmpt, dpth, pst, wt lkg, cnt, ht nd ltg lms f mltipl ndwt nds nd limitd wt scs. Th systm fnctins ifid i th xpimnts. Rfncs [1] S. Yn, Digitl lctnic tchnlgy bs, Bijing: High dctin pss, 2005 [2] N.B. Z, Mlti-chnnl dt cqisitin systm bsd n singl chip dsign,instmnt nd mt,2011 [3] J. Yng. Dsign f CAN Bs Intfc Cicit. Offic Infmtiztin. 2010, (1): [4] M. H, Y. D. Intfc Cicit Dsign Bsd n CAN Bs. Cmmnictin tchnlgy. 2008(7): [5] Q.K. Sng, J.C. Jing. Th Dsign f CAN-BUS Nds Bsd n that89c52 SCM. Tchniqs f Atmtin nd Applictins. 2009,28(5):55-68 [6] Y. Zng, Y. Li. Bing dt cqisitin systm bsd n RS232 intfc. Th g f lcticity,