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| package modbusx
|
| import (
| "encoding/binary"
| )
|
| func Read(ipAddr string, address uint16, quantity uint16) (data []byte, err error) {
| address--
| cli := getModbusConnection(ipAddr)
| data, err = cli.ReadHoldingRegisters(address, quantity)
| dealErr(err, ipAddr)
| if err != nil {
| cli = getModbusConnection(ipAddr)
| data, err = cli.ReadHoldingRegisters(address, quantity)
| dealErr(err, ipAddr)
| }
| return
| }
|
| func Write(ipAddr string, address uint16, value int) (err error) {
| address--
| var bytesVal []byte
| bytesVal = intToBytes(value)
| cli := getModbusConnection(ipAddr)
| _, err = cli.WriteMultipleRegisters(address, uint16(len(bytesVal)), bytesVal)
| dealErr(err, ipAddr)
| return err
| }
|
| func intToBytes(value int) (data []byte) {
| if value <= 1<<16 {
| data = make([]byte, 2)
| binary.BigEndian.PutUint16(data, uint16(value))
| } else {
| data = make([]byte, 4)
| binary.BigEndian.PutUint32(data, uint32(value))
| }
| return
| }
|
| func dealErr(err error, ipAddr string) {
| if err != nil {
| unsetModbusConnection(ipAddr) //失败则删除缓存的连接
| }
| }
|
|
