CDT规约解读

CDT规约解读

在电力行业，采集RTU数据经常会选择CDT规约，而物理链路上一般走串口232转485。如果是短距离传输，不需要转发器，传输距离长了最好232转485后转光纤再转485转232，防止信号衰败丢失。

下面主要介绍CDT规约。相对101规约、102规约和104规约，CDT规约比较简单。

调试的时候可以使用串口调试工具接收串口报文，3个eb 90 开头的即可确定是CDT规约。

转：

规约要点

（1）源地址和目的地址设为1。

（2）频率转发序号设置从偶数开始,通常为2点放到一个信息字内,功能码0x8A, BCD码发送。

（3）要求转发遥测值传送的是一次值,要配置系数值。（工程转换或比例缩放）

（4）转发遥测值带品质描述。

设置溢出标志：额定值小于2047的设成额定值，大于2047的设成2047,电压限值设成1.2倍额定值。

由于CDT发送的最大码值为-2048 ~ 2047,所以当最大值大于2047时要放缩发送.

可计算总加遥测上传。

（5）遥测转发序列可设定:ABA ABA ABC ABA ABA ABC ABA ABA ABC D1 D2 (举例)

（6）遥测分为重要遥测,次要遥测,一般遥测。YCA32点;YCB32点;YCC其余点，遥测分配的功能码共有128个，最大传送数256。D1遥信分配的功能码共有16个，最大传送数512.

（7）每个E帧只上送一个SOE。

（8）华北网调要求远动双通道上送数据，保证其主备通道数据完全一致。（双机并行或单机双通道）

（9）事故总信号放在第一位遥信，即YX1；事故时为“1”，无事故时为“0”。总加遥测上送。

上行信息的优先级排列顺序和传送时间要求：

l 对时的子站时钟返回信息插入传送

l 变位遥信、子站工作状态变化信息插入传送，要求在1s内送到主站

l 遥控、升降命令的返送校核信息插入传送

l 重要遥测安排在A帧传送，循环时间不大于3s

l 次要遥测安排在B帧传送，循环时间一般不大于6s

l 一般遥测安排在C帧传送，循环时间一般不大于20s

l 遥信状态信息，包括子站工作状态信息，安排在D1帧定时传送

l 电能脉冲计数值安排在D2帧定时传送

l 事项顺序记录安排在E帧以帧插入方式传送

下行(主站至子站)命令的优先级排列如下：

l 召唤子站时钟，设置子站时钟校正值，设置子站时钟

l 遥控选择、执行、撤消命令，升降选择、执行、撤消命令，设定命令

l 广播命令

l 复归命令

l D帧传送的遥信状态、电能脉冲计数值是慢变化量，以几分钟至几十分钟循环传送。

l E帧传送的事件顺序记录是随机量，同一事件顺序记录应分别在三个E帧内重复传送。帧类别代号定义表

下文是一段CDT报文解读的例子，读者可以根据CDT规约标准来逐渐理解CDT规约。RTU发送

重要遥测(A帧) 源地址=1 目标地址=1 信息字数=32

eb 90 eb 90 eb 90 同步头

71 61 20 01 01 11 控制字

00 00 00 00 00 FF 01 00 00 00 00 9d 02 00 00 00 00 3b

03 00 00 00 00 59 04 00 00 00 00 70 05 00 00 00 00 12

06 00 00 00 00 b4 07 00 00 00 00 d6 08 00 00 00 00 e6

09 00 00 00 00 84 0a 00 00 00 00 22 0b 00 00 00 00 40

0c 00 00 00 00 69 0d 00 00 00 00 0b 0e 00 00 00 00 ad

0f 00 00 00 00 cf 10 00 00 00 00 cd 11 00 00 00 00 af

12 00 00 00 00 09 13 00 00 00 00 6b 14 00 00 00 00 42

15 00 00 00 00 20 16 00 00 00 00 86 17 00 00 00 00 e4

18 00 00 00 00 d4 19 00 00 00 00 b6 1a 00 00 00 00 10

1b 00 00 00 00 72 1c 00 00 00 00 5b 1d 00 00 00 00 39

1e 00 00 00 00 9f 1f 00 00 00 00 fd

解读

eb 90 eb 90 eb 90 同步头

71 61 20 01 01 11 控制字61重要遥测20 32个信息数01 源站，01 目的站11 校验

00 00 00 00 00 FF

00（信息地址）00 00 （点号0，值为0 ）00 00 （点号1，值为0 ）FF （校验）

解读01 00 00 00 00 9d 其他类似

01（信息地址）00 00 （点号2，值为0 ）00 00 （点号3，值为0 ）FF （校验）

次要遥测（B帧）源地址=1 目标地址=1 信息字数=32

eb 90 eb 90 eb 90 同步头

71 c2 20 01 01 d4 控制字

20 00 00 00 00 9b 21 00 00 00 00 f9 22 00 00 00 00 5f

23 00 00 00 00 3d 24 00 00 00 00 14 25 00 00 00 00 76

26 00 00 00 00 d0 27 00 00 00 00 b2 28 00 00 00 00 82

29 00 00 0000 e0 2a 00 00 00 00 46 2b 00 00 00 00 24

2c 00 00 00 00 0d 2d 00 00 00 00 6f 2e 00 00 00 00 c9

2f 00 00 00 00 ab 30 00 00 00 00 a9 31 00 00 00 00 cb

32 00 00 00 00 6d 33 00 00 00 00 0f 34 00 00 00 00 26

35 0000 00 00 44 36 00 00 00 00 e2 37 00 00 00 00 80

38 00 00 00 00 b0 39 00 00 00 00 d2 3a 00 00 00 00 74

3b 00 00 00 00 16 3c 00 00 00 00 3f 3d 00 00 00 00 5d

3e 00 00 00 00 fb 3f 00 00 00 00 99

解读：

eb 90 eb 90 eb 90 同步头

71 c2 20 01 01 d4 控制字c2次要遥测20 32个信息数01 源站，01 目的站d4 校验信息字解读同上。

电能脉冲数值（D2帧）源地址=1 目标地址=1 信息字数=64

eb 90 eb 90 eb 90 71 85 40 01 01 e8

a0 00 00 00 00 0c a1 00 00 00 00 6e a2 00 00 00 00 c8

a3 00 00 00 00 aa a4 00 00 00 00 83 a5 00 00 00 00 e1

a6 00 00 00 00 47 a7 00 00 00 00 25 a8 00 00 00 00 15

a9 00 00 00 00 77 aa 00 00 00 00 d1 ab 00 00 00 00 b3

ac 00 00 00 00 9a ad 00 00 00 00 f8 ae 00 00 00 00 5e

af 00 00 00 00 3c b0 00 00 00 00 3e b1 00 00 00 00 5c

b2 00 00 00 00 fa b3 00 00 00 00 98 b4 00 00 00 00 b1

b5 00 00 00 00 d3 b6 00 00 00 00 75 b7 00 00 00 00 17

b8 00 00 00 00 27 b9 00 00 00 00 45 ba 00 00 00 00 e3

bb 00 00 00 00 81 bc 00 00 00 00 a8 bd 00 00 00 00 ca

be 00 00 00 00 6c bf 00 00 00 00 0e c0 00 00 00 00 a0

c1 00 00 00 00 c2 c2 00 00 00 00 64 c3 00 00 00 00 06

c4 00 00 00 00 2f c5 00 00 00 00 4d c6 00 00 00 00 eb

c7 00 00 00 00 89 c8 00 00 00 00 b9 c9 00 00 00 00 db

ca 00 00 00 00 7d cb 00 00 00 00 1f cc 00 00 00 00 36

cd 00 00 00 00 54 ce 00 00 00 00 f2 cf 00 00 00 00 90

d0 00 00 00 00 92 d1 00 00 00 00 f0 d2 00 00 00 00 56

d3 00 00 00 00 34 d4 00 00 00 00 1d d5 00 00 00 00 7f

d6 00 00 00 00 d9 d7 00 00 00 00 bb d8 00 00 00 00 8b

d9 00 00 00 00 e9 da 00 00 00 00 4f db 00 00 00 00 2d

dc 00 00 00 00 04 dd 00 00 00 00 66 de 0000 00 00 c0

df 00 00 00 00 a2

解读

eb 90 eb 90 eb 90 同步头

71 85 40 01 01 e8 控制字85电能脉冲记数值40 64个信息数01 源站，01 目的站e8 校验a0 00 00 00 00 0c 第0路脉冲脉冲计数值0，注意计数值为32位。

a1 00 00 00 00 6e第1路脉冲脉冲计数值0，注意计数值为32位

其他类似。