140CRA93100下面就ModBus RTU協(xié)議簡要介紹如下：
一、通訊協(xié)議
（一）、通訊傳送方式：
　　 通訊傳送分為獨立的信息頭，和發(fā)送的編碼數(shù)據(jù)。以下的通訊傳送方式定義也與MODBUS RTU通訊規(guī)約相兼容：
編 碼
8位二進制
起始位
1位
數(shù)據(jù)位
8位
奇偶校驗位
1位（偶校驗位）
停止位
1位
錯誤校檢
CRC（冗余循環(huán)碼）
初始結(jié)構(gòu) = ≥4字節(jié)的時間
地址碼 = 1 字節(jié)
功能碼 = 1 字節(jié)
數(shù)據(jù)區(qū) = N 字節(jié)
錯誤校檢 = 16位CRC碼

結(jié)束結(jié)構(gòu) = ≥4字節(jié)的時間

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NORTEL NTCA03DG
NORTEL NTCA03DJ
NORTEL NTCA03DK
NORTEL NTCA03DL
NORTEL NTCA03EK
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NORTEL NTCA03HA
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DS1304002 NORTEL
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NORTEL DS1333001
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NORTEL NT0H11EK
DS1405011 IPUPABFHAA 
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NTNQ93AA NORTEL
NTNQ11AA NORTEL
NORTEL NTMW08AA 
NTNQ85AA NORTEL
NORTEL NTNQ89AA 
NTVQ01BA NORTEL
NORTEL DS1405012-E5
NORTEL NTTC40ABE6
NORTEL NTCA15CA
NORTEL NT8T06AA 
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NTNQ86AA NORTEL
NORTEL 8616GTE
MM-4SERIAL NORTEL
NORTEL AA1403003-E5
NORTEL AA1403003-E5
NORTEL NTEU86AA
NORTEL NTNN01AA
NORTEL NTNQ01AG
NORTEL NT0H03BB
NORTEL NT0H03DB
NORTEL NT0H03DC
NORTEL NT0H03DD
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NORTEL NT0H03BC
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QPC673B NORTEL
QPC687A NORTEL
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DS1404065-E5 NORTEL
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NTAK20ABE5 + NTBK51AA
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NT0H03CA NORTEL
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NORTEL DS1404034 
NT6D43AA NORTEL
NORTEL NT0H02MD
QPC450E NORTEL
ANALOG NORTEL
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NTFN58GA NORTEL
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NORTEL NTCA12HG
NTDK20JA NORTEL
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NTN401DA NORTEL
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NT5S05AVE5 NORTEL
NORTEL AL4500A05-E6
NORTEL NT5D03BA 
NT5D10TA NORTEL
NORTEL NT5D03UA 
NT5D03NA  NORTEL
NORTEL EB1639107
NORTEL NTHR35CA 
NT0H16FD NORTEL
NORTEL NTQT30DA WMD5E0THAA
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NORTEL 8608GTE DS1404044
NORTEL 8608GBIC DS1404015
NORTEL 8348TX DS1404077
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NORTEL DATA-ONLY MOUDLE-A NTBW89DA
NORTEL AL4500E14-E6
NORTEL AG2204015
NORTEL AG2204016
AL2001A22 NORTEL
NTAK11BD NORTEL
NT0H35BA NORTEL
NT6X60CA NORTEL
NTGY30BA NORTEL
NORTEL DS1404065-E5
NORTEL NT0H03GA
NTAK11GC NORTEL
32R1783-NORTEL
NORTEL NTNQ50AA
NTAK11GC NORTEL
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NORTEL NTLX05AB
NORTEL NT0H16AC
NTVH29AB NORTEL
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NTN31112 NORTEL
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NORTEL Networks NTCA11PK
NTCA70VK NORTEL
NTCA11NK NORTEL
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AL1001A05-E5 NORTEL
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NTDK92BB NTRH30AA NT8D09BB
NORTEL NT7E02FB
DS1405011-E5 NORTEL
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NTCA50BA NORTEL
NTCA50BA NORTEL
NTN404CA NORTEL
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DS1404024 NORTEL
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AXM-A-16-S-1xx CM1009E30
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DS1404078 NORTEL
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NORTEL NT0H16DB
NORTEL NT0H16DC
NORTEL NT0H16EB
DSS12-LG-NORTEL N0199946
DS1404007-GS NORTEL
NTCA70VK NORTEL
NTFN48GA
NTAK11BDE5
NORTEL NTDK20GA
NORTEL DS1404063
NORTEL DS1404079
NTLX06AC
NORTEL NT0H33FB
NORTEL NT0H33DB
NORTEL NT0H33AB
NORTEL NT9X44AD 
NORTEL NT0H33HB
NORTEL NT4N46AA
NORTEL NTFN48EA
NORTEL 32UPB00302DEX
NORTEL NT0H40BC-E5
NORTEL NTN435BB SN55M79AAA
NORTEL 8648GTR DS1404092-E5
NORTEL NETWORKS NT8E05BB 
EB1639130E5北電
DS1405A14北電
NTBK50AA NORTEL
NORTEL NTNN18AA
NORTEL NTFP43GA 
NORTEL NTN374AA
DS1405A08 NORTEL
NTBK50AAE5 NORTEL
NORTEL NTHR29FA
NT5S02MAE5 NORTEL
NORTEL SR0000044E5 SM-4FXO
NORTEL SR0000048E5 SM-4FXS/DID 
NORTEL SR0000008E5 SM-2SERIAL
NORTEL NTNQ69BA 36
NT0H33KA NORTEL
NORTEL NTCA20AA
NORTEL NTEU12AA
NORTEL G3L-2126-45N
NORTEL NTUM30DA
NORTEL NTUM30AA
AF2104004 NORTEL
NORTEL NTLX82BA
DNIFR40BAA NORTEL
NORTEL NTJS13DA
NTAK11BD NORTEL
8348TX-PWR DS1404078
NORTEL NTKD20AA 25UTM00750HWF
NTBW30DA NORTEL
NT5D97AA NORTEL
NT5D97AB NORTEL
NORTEL NTHR17FA
NORTEL NT7B10AAEE
DM1401135 NORTEL
NORTEL NT7E02FB
NORTEL NT7E02DC
NORTEL NTN423BA
4548GT-PWR AL4500A14-E6
NORTEL NTBW89DA
NTBW70AA NORTEL
NORTEL NTRX90AA
NORTEL NTN435BA
NT1R20AB NORTEL
DS1404011 NORTEL
NORTEL DS1404038
DJ1404001 XLR1297SF
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NTAK11BD NORTEL
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NTRX50FS NORTEL
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NT8E11FJ SNT4ED0BAA
NT8E11MK NORTEL
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NORTEL NT5C10BB
NORTEL 4526T-PWR
NORTEL AL4512A01
NT0H40BC NORTEL
DS1404005 NORTEL
AL1001A05-E5 NORTEL
NEW BES-210-48T NT5S02BAE5
NORTEL NTN404KA
NTHW78AA NORTEL
NTRH14AA NT4N97AA
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NTNN01AA NORTEL
NTFN33AB NORTEL
NT4N39AA NORTEL
NTNQ21AA NORTEL
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NORTEL NTFP41DC
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NT0H43CA NORTEL
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NT0H59AA NORTEL
NT0H32GE NORTEL
NT5D210302 NORTEL
NT5D210402 NORTEL
NORTEL NTN550BA
NTFN33AA NORTEL
NORTEL NTN410GA
NORTEL NT0489AA
NORTEL NT6X30CA
NORTEL NT0H01CC
NORTEL DS1404005
NT6X50EC NORTEL
NORTEL NTN424BH SNP7C99AAA 
NORTEL DS1405012-E5 
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NORTEL NT5D2105機架
NORTEL ENIFRY01AA
NORTEL NTFX31AA
EB1639130 NORTEL
NORTEL NTLX61AA
NORTEL NT8D09CAE5
NORTEL NT6X30CA
NORTEL NTFX32CA 
FRE2-060E NORTEL
DM1401058 NORTEL
NORTEL NT5D2105
NT0H32FE NORTEL
NORTEL NTVQ09AB
NORTEL NT9X95CU
NORTEL NTQT25AA
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NORTEL NT7E02BL
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NORTEL NT9T6514E5
NORTEL NTN433BB
EB1639005 NORTEL
NORTEL 5520-24T-PWR
NORTEL NT5D51AC
NT5G61AA NORTEL
NORTEL NT5D12AF
NTAK11BB NORTEL
NORTEL DJ1412A02
NORTEL NTN414AH
NORTEL NTFX32BA
NORTEL DS1404092-E5
NORTEL AA0005E08
NORTEL NTQA21AA
NT0H57BB NORTEL 
NT0H32HE NORTEL
NORTEL CM10081018
NORTEL NTN423BA 
NORTEL DS1404092
NORTEL NTQA41AA
NORTEL NT0J0811
DR4001A71E5 NORTEL
NT5D2104-03 NORTEL
NORTEL NT8D22AD 
NORTEL NT5D1201 
NTN433BB NORTEL
NORTEL AL4500A13
NORTEL NTFN56AA
DS1404063-E5 NORTEL
NORTEL DS1404091
NORTEL AL2033003 
NORTEL NT8D01BC
NORTEL NT8D53BB-06 
NTBK51CA NORTEL
NORTEL NTEU40AA
NORTEL NT3P21GD
SR4134-SR0002002E5 w/ MM-24FE-POE-SR0000016E5
NORTEL 470-48T-PWR 
NORTEL NTRX50CG
NORTEL NTCA01EA
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NORTEL AL2012E34, AL2012A34
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NORTEL NTCC14JA
DS1404076-E5 NORTEL
NORTEL NTCK16AE
NORTEL AL1001A15-E5
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NORTEL NT2E44AF
NORTEL NTFP38CB