---
tags: 'Acer'
---
NEMA AC & DC Protocol & Water Meter
===
# LoRaWAN
### Upload Link ( Status Report)

typedef struct
{
    UINT8   UUID;
    UINT8   payloadType=2;
    UINT8   startIndex;
    UINT8   varNumber;
    FLOAT32 variables[varNumber];
} STC_LORAWAN_SEND_PACKAGE;

Format:  Port:Data
Port: 12

Data:  Byte 0 , UUID , not used in LoRaWAN
       Byte 1 , Data Type , always is 2  
       Byte 2 , Variable Start Index
       Byte 3 , Variable Number
       Byte 4 ~ 7, Variable 0 in FLOAT32 format  [Voltage]  
       Byte 8 ~ 11, Variable 1 in FLOAT32 format [Current]
       Byte 12 ~ 13, CRC16 in Little Endian format

### Switch Command

01 01 06 00 0C [TIME] [Power] [CRC16]

* Time:
灯在打开后会自动关闭,亮灯时间是打开多久的意思。取值范围0-144,表示0-1440分钟。
Time for command duration. Range from 0 ~ 144, that means from 0 ~ 1440 mins.

* Power:
The power for street light. Range from 0 ~ 100 %
亮灯电流。取值范围0-120,表示0-3600m A。这是调整灯的亮度用,比如0m A就可以关灯,1800m A就是50%
的亮度。

### Command Ack

01 06 06 00 0C [TIME] [Power] [CRC16]

# LoRa P2P
## Query Command

P2P_ID 05 03 00 00 00 02 [CRC16]

Device only report this command if the ID is themeself.
收到自己的 ID 時才須回報.
## Query Response

typedef struct
{
    UINT8   UUID;
    UINT8   payloadType=2;
    UINT8   startIndex;
    UINT8   varNumber;
    FLOAT32 variables[varNumber];
} STC_LORAWAN_SEND_PACKAGE;

Format:  Port:Data
Port: 12

Data:  Byte 0 , UUID , not used in LoRaWAN
       Byte 1 , Data Type , always is 2  
       Byte 2 , Variable Start Index
       Byte 3 , Variable Number
       Byte 4 ~ 7, Variable 0 in FLOAT32 format  [Voltage]  
       Byte 8 ~ 11, Variable 1 in FLOAT32 format [Current]
       Byte 12 ~ 13, CRC16 in Little Endian format

## Switch Command

P2P_ID 05 06 00 0C [TIME] [Power] [CRC16]

Device will execute this commnand if the P2P_ID is 0x00 or themself.
收到自己的 P2P_ID 或 0x00 皆須執行開關
* Time:
Time for command duration. Range from 0 ~ 144, that means from 0 ~ 1440 mins.
灯在打开后会自动关闭,亮灯时间是打开多久的意思。取值范围0-144,表示0-1440分钟。

* Power:
The power for street light. Range from 0 ~ 100 %
亮灯电流。取值范围0-120,表示0-3600m A。这是调整灯的亮度用,比如0m A就可以关灯,1800m A就是50%
的亮度。
Byte 12 ~ 13, CRC16 in Little Endian format

## Command Ack

P2P_ID 06 06 00 0C [TIME] [Power] [CRC16]

## Water Meter
Data Format:
Byte 0 ~ Byte 5 : Bluetooth Module MAC Address
Byte 6 ~ Byte 9 : Meter Value ( FLOAT32 little endian )
Byte 10 ~ Byte11: Modbus CRC16 ( little endian )

Data Format in C structure:
typedef struct
{
UINT8 macAddress[6];
FLOAT32 meterValue;
UINT16 crc;
}

此外,LoRa P2P 的頻率由於怕與 LoRaWAN 有衝突,故我建議設定為 866MHz (
868-2 MHz )
設定 LoRa P2P 模組為 866MHz 的二進位字串為:
0xd1,0x03,0x05,0x00,0x01,0x52,0x48,0x0c,0xc0

# CRC16

UINT16 modbus_crc_generate(UINT8 *str,UINT32 len)
{
	const UINT16 iCRCGen = 0xA001;
	UINT16 iCRCReg = 0xFFFF;
	UINT32 i,j;
	len&=0xff;
	if (len != 0)
	{
		for(i=0;i<len;i++)
		{
			iCRCReg ^= (UINT16)str[i];
			for(j=0;j<8;j++)
			{
				if (iCRCReg & 0x01)
				{
					iCRCReg >>= 1;
					iCRCReg ^= iCRCGen;
				}
				else
				{
					iCRCReg >>= 1;
				}
			}
		}
	}
	return iCRCReg;
}