lupodharkael/modbus_exporter

Exporter which retrieves stats from a modbus system and exports them via HTTP for Prometheus consumption.

modbus_exporter's Issues

Maintained fork information here

https://github.com/richih/modbus_exporter follows Prometheus best practices and will see more updates over time.

Add support for float32 registers

We have a modbus device that uses a combination of 2 registers to return a float32 result (for example ampere).
Is it possible to create support for this kind of values ?

As an example, following code supports this operation:

handler := modbus.NewTCPClientHandler("x.x.x.x:502")
handler.Timeout = 5 * time.Second
handler.SlaveId = 2
handler.Logger = log.New(os.Stdout, "tcp: ", log.LstdFlags)
handler.Connect()
defer handler.Close()

client := modbus.NewClient(handler)
var modBytes []byte
modBytes, err := client.ReadHoldingRegisters(2999, 2) -> fetch 2 registers
if err != nil || modBytes == nil {
fmt.Println(err)
}
encodedStr := hex.EncodeToString(modBytes) -> combine them to one big hexadecimal number
n, err := strconv.ParseUint(encodedStr, 16, 32)
if err != nil {
panic(err)
}
n2 := uint32(n)
f := *(*float32)(unsafe.Pointer(&n2))
b := float64(f) -> create a float64 integer for prometheus
phase_1_ampere.Set(b) -> the value we just created
http.Handle("/metrics", prometheus.Handler())
http.ListenAndServe(":8080", nil)
}