DNP 3.0
DNP 3.0 （Distributed Network Protocol 3.0）是一种通信协议，主要用于工业自动化领域，特别是在电力系统中，用于监控和数据采集（SCADA）系统。它允许远程终端单元（RTU）和主站系统之间进行可靠的数据交换。
设备设置
| 字段 | 说明 |
|---|---|
| host | 设备 IP 地址 |
| port | 设备端口号, 默认20000 |
| masterid | 主站 ID, 默认1 |
| slaveid | 从站 ID, 默认2 |
| class0123_interval | Class0123 拉取间隔, 默认20000毫秒 |
| class123_interval | Class123 拉取间隔, 默认1000毫秒 |
| time_sync | 时间同步, 默认 No |
支持的数据类型
- uint8
- uint16
- int16
- uint32
- int32
- float
- bit
地址格式
obj.var.index(.attribute)
CROB.index:counter:on-time:off-time
obj 和 var
在 DNP 3.0 协议中，使用 obj 和 var 来定义一个对象类型，index 指定一组对象实体的具体的对象，下表索引从0开始。attribute 目前只支持 value，如果不填写，默认为value。
目前支持下列对象：
| obj | var | 对象 | r/w | 类型 |
|---|---|---|---|---|
| 1 | 1 | binary input | r | bit |
| 1 | 2 | binary input with status | r | bit |
| 2 | 1 | binary input change without time | r | bit |
| 2 | 2 | binary input change with absolute time | r | bit |
| 2 | 3 | binary input change without relative time | r | bit |
| 10 | 1 | binary output | r | bit |
| 10 | 2 | binary output with status | r | bit |
| 10 | 3 | binary output change with time | r | bit |
| 20 | 1 | 32-bit binary counter with flag | r | uint32/int32 |
| 20 | 2 | 16-bit binary counter with flag | r | uint16/uint16 |
| 20 | 5 | 32-bit binary counter without flag | r | uint32/int32 |
| 20 | 6 | 16-bit binary counter without flag | r | uint16/int16 |
| 21 | 1 | 32-bit frozen binary counter | r | uint32/int32 |
| 21 | 2 | 16-bit frozen binary counter | r | uint16/int16 |
| 30 | 1 | 32-bit analog input | r | uint32/int32 |
| 30 | 2 | 16-bit analog input | r | uint16/int16 |
| 30 | 3 | 32-bit analog input without flag | r | uint32/int32 |
| 30 | 5 | 32-bit float analog input | r | float |
| 32 | 1 | 32-bit analog input change without time | r | uint32/int32 |
| 32 | 2 | 16-bit analog input change without time | r | uint16/int16 |
| 32 | 3 | 32-bit analog input change with time | r | uint32/int32 |
| 32 | 4 | 16-bit analog input change with time | r | uint16/int16 |
| 32 | 7 | 32-bit float analog input change with time | r | float |
| 40 | 1 | 32-bit analog output | r | uint32/int32 |
| 40 | 2 | 16-bit analog output | r | uint16/int16 |
| 40 | 3 | 32-bit float analog output | r | flaot |
| 41 | 1 | 32-bit analog output block | w | uint32/int32 |
| 41 | 2 | 16-bit analog output block | w | uint16/int16 |
| 41 | 3 | 32-bit float analog output block | w | float |
| 42 | 7 | 32-bit float analog output event with time | r | float |
CROB（Control Relay Output Block）是一个特殊的对象，用于驱动开关型输出设备 （binary output），只写，类型为 uint8, 因为其除了 Control Code 之外，还需要设置 counter，on-time 和 off-time。 Control Code 取值如下：
| Control Code | Action |
|---|---|
| 1 | output pluse on |
| 2 | output pluse off |
| 3 | output latch on |
| 4 | output latch off |
| 65 | output pluse on + close |
| 66 | output pluse off + close |
| 67 | output latch on + close |
| 68 | output latch off + close |
| 129 | output pluse on + trip |
| 130 | output pluse off + trip |
| 131 | output latch on + trip |
| 132 | output latch off + trip |
| +16 | + queue |
| +32 | + clear |
地址示例
| 地址 | 数据类型 | 说明 |
|---|---|---|
| 1.2.0 | bit | binary input 下标0的值 |
| 1.2.1 | bit | binary input 下标1的值 |
| 2.2.1 | bit | binary input 下标1的值，带绝对时间戳 |
| CROB.0:0:0:0 | bit | 控制 biary output 下标0输出 |
| 40.1.0 | bit | 32-bit binary output 下标0的值 |