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enervent-ctrl
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gh-5 Commenting

This commit is contained in:
Jarno Rankinen 2023-02-01 00:04:13 +02:00
parent f4eb787a10
commit 7eb75541d3
1 changed files with 7 additions and 0 deletions
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7
enervent-ctrl-go/pingvinKL/pingvinKL.go
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@ -135,6 +135,9 @@ func (p PingvinKL) updateRegisters() {
client := modbus.NewClient(handler) client := modbus.NewClient(handler)
regs := len(p.Registers) regs := len(p.Registers)
k := 0 k := 0
// modbus.ReadHoldingRegisters can read 125 regs at a time, so first we loop
// until all the values are fethed, increasing the value of k for each register
// When there are less than 125 registers to go, it's the last pass
for k < regs { for k < regs {
r := 125 r := 125
if regs-k < 125 { if regs-k < 125 {
@ -144,6 +147,10 @@ func (p PingvinKL) updateRegisters() {
if err != nil { if err != nil {
log.Fatal("updateRegisters: client.ReadCoils: ", err) log.Fatal("updateRegisters: client.ReadCoils: ", err)
} }
// The values represent 16 bit integers, but modbus works with bytes
// Each even byte of the returned []byte is the 8 MSBs of a new 16-bit
// value, so for each even byte in the reponse slice we bitshift the byte
// left by 8, then add the odd byte as is to the shifted 16-bit value
msb := true msb := true
value := 0 value := 0
for i := 0; i < len(results); i++ { for i := 0; i < len(results); i++ {