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pws-formula

v0.0.6

Published

This is a formula execute the string or buffer format formula libray to get values from string or buffer.

Downloads

12

Readme

PWS公式系统设计说明

pws_fomular_design_srs

修订记录

| 序号 | 日期 | 作者 | 说明 | | :--: | :--------: | :-------: | ---- | | 1 | 2017-12-21 | thomas.li | 新建文档 |

1. 概述

1.1 文档目的

定义PWS数据采集系统的返回串计算公式定义及功能

1.2 项目范围

本产品主要面向中小型机房客户,为机房的基础设施提供环境数据采集检测服务。

1.3 术语

| 缩略语 | 别名 | 定义 | | :----: | :-----: | --------------------------------- | | Hex | 十六进制 | 返回串的数据构成方式,例如0x01030401000036C403 | | ascii | ascii码 | 返回串的数据构成方式,例如~132382823434 | | modbus | modbus | 数据通信协议 | | pmbus | 电总协议 | 数据定义协议 | | bcd | 数据格式 | 以16进制表示十进制数,例如0x0326=>326 | | crc | CRC校验算法 | 一种校验算法 | | sum | sum校验算法 | 一种校验算法 |

1.4 相关文档

| 序号 | 文档名 | 文档编号 | | :--: | ----------------------- | ---- | | 1 | pws_database_design_srs | | | 2 | | |

2. 十六进制公式

###2.1 hx(start,length=2,byte_order=1)

  • 对象:hex

  • 说明:将byte[]转换成十进制整数

  • 返回:整数或者-1(参数错误)

  • start:开始位,从0开始计算,Byte的顺序

  • length:长度,按照Byte计算,默认为2

  • byte_order:1-高位在前,0-高位在后

    string:0x01030401010038CCCC

    hx(6,2)=hx(3,2,1)=int(0x0101,16)=257

###2.2 hb(start,index)

  • 对象:hex

  • 说明:截取byte[]中的bit值

  • 返回:0或1或者-1(参数错误)

  • start:开始位,从0开始计算,以Byte为单位

  • index:bit位,从右向左,依次为0-7

    string:0x010304010100b38CCCC

    hb(3,0)=0b0000 0001的第0索引,即1

###2.3 ht(start,length=2)

  • 对象:hex

  • 说明:将十六进制表示的bcd码转换成十进制整数

  • 编码方式:BCD(0x0101=>整数101)

  • 返回:整数或者 -1(参数错误)

  • start:开始位,从0开始计算,以Byte为单位

  • length位:Byte长度

    string:0x010304010100b38CCCC

    ht(6,2)=101

###2.4 hc(start,length=4)

  • 对象:hex

  • 说明:将十六进制表示的ascii码数字转换成浮点数

  • 返回:整数或者 -1(参数错误) -2:数据错误

  • start:开始位,从0开始计算,以Byte为单位

  • length位:Byte长度

    string:0x01030432322E320030372E310000302D31322E3800

    hc(3,6)=32322E320030=22.2

    hc(9,6)=372E31000030=7.1

    hc(15,6)=2D31322E3800=-12.8

3. ASCII公式

###3.1 ap(start,order=1)

  • 对象:ascii

  • 说明:截取电总协议中的字符串,并转换成浮点数

  • 返回:浮点数,-1-输入错误

  • start:开始位,从0开始计算

  • order:1-高位在后 0-高位在前

    string:~10012A0020680133B35A43000....

    ap(15)=ap(15,1)=218.6999...

###3.2 ax(start,length=2,ascii_order=0)

  • 对象:ascii

  • 说明:把字符串作为十六进制字符串,截取并转换成整数

  • 返回:正整数,-1-输入错误

  • start:开始位,从0开始计算

  • length:默认两位字符凑成一个十六进制数字*length

  • order:1-高位在后 0-高位在前

    string:~10012A0020....

    ax(1)=ap(1,2,0)=int(0x1001)=4097

    ax(1,2,1)=int(0x0110)=272

    ax(1,1)=int(0x10)=16

###3.3 ad(start,length)

  • 对象:ascii

  • 说明:将字符串转换成浮点数

  • 返回:浮点数,-1-输入错误,-2-字符串错误或公式错误

  • start:开始位,从0开始计算

  • length:长度

    string=':F0061A0102090463FFFFFF5100080000E30000000000017A014C04971FQ....'

    ad(9,4)=ad('0209')=209.0

    ad13,4)=ad('0463')=463.0

    ad(5,1)=1

    ad(3,1)=0

    string='(208.4 140.0 208.4 034 59.9 2.05 35.0 00110000'

    ad(28,4)=2.05

###3.4 ac(start,length)

  • 对象:ascii

  • 说明:将bcd字符串转换成浮点数

  • 返回:浮点数,-1-输入错误,-2-字符串错误或公式错误

  • start:开始位,从0开始计算

  • length:长度

    string=01A091023131314D5330312E30342E313331302E34322E3436333830333832333832.....

    ac(50,3)='333830'=380

    ac(18,1)='30'=0

    ac(20,1)=‘31’=1

###3.5 ab(start,index)

  • 对象:ascii

  • 说明:将字符串按照十六进制方式,每次取2位转换成布尔值

  • 返回: 0/1,-1-输入参数错误 -2:字符格式错误

  • start:开始位,从0开始计算

  • index:从右至左,从0-7

    string=':F0061A0102090463FFFFFF5100080000E30000000000017A014C04971FQ'

    ab(33,4)='E3'='1110 0011'=0

    ab(33,5)='E3'='1110 0011'=1​

###3.6 av()

  • 对象:ascii

  • 说明:将字符串直接转换成浮点数(支持负数)

  • 返回:浮点数,-2:格式错误

    string='-32.6'

    av()=-32.6

    string='a'

    av()=-2

    string='3'

    av()=3.0

4. 逻辑判断

###4.1 pif(condition, out_true, out_false)

  • 对象:hex/ascii

  • 说明:如果condition为true,返回out_true,否则为out_false

    例如:

    string= 01A091023131314D5330312E30342E313331302E34322E3436333830333832333832323138323139323230303031313030303630303036303030362B303030322B303030312B3030303135302E3035302E303337373337373337343432352B303030303030303230303031303030312A2A2A2E2A2A2A2A2E2A2A2A2A2E2A2B30302E303030393030353030353039393931303003BF

    'pif(ac(50,3)==380,ac(50,3),0)'

    condition=ac(50,3)='333830'=380 true

    所以返回ac(50,3)=380

    否则 返回0

5. 校验

###5.1 crc(hex)

  • 对象:hex
  • 校验方式:crc

###5.2 sum(hex)

  • 对象:hex
  • 校验方式:和(所有非校验字段的十六进制和&&FF)

###5.3 长度(hex)

  • 对象:hex
  • 校验方式:长度计算

###5.4 长度(ascii)

  • 对象:ascii
  • 校验方式:长度计算(max=0,min=0)

###5.5 lrc(ascii)

  • 对象:ascii
  • 校验方式:lrc校验(非校验字节按照十六进制和取反加一)

5.6 sum(ascii)

  • 对象:ascii
  • 校验方式:和校验(非校验字节按照十六进制和)

5.7 pmbus(ascii)

  • 对象:ascii
  • 校验方式:电总(非校验字节按照十六进制和对FFF取反加一)

6. 工具

###6.1 crc计算

  • 对象:hex

###6.2 sum(hex)计算

  • 对象:hex

6.3 lrc计算

  • 对象:ascii

6.4 sum(ascii)计算

  • 对象:ascii

6.5 电总(ascii)计算

  • 对象:ascii