com.serotonin.modbus4j.exception.IllegalFunctionException: Function code: 0x7e，读取寄存器问题

[SummerMineJack]

作者你好，请问使用modbus4j 读取寄存器时发生异常com.serotonin.modbus4j.exception.IllegalFunctionException: Function code: 0x7e，我的modbus协议中03是读取寄存器的，总共有29个寄存器，我需要开启service后台轮询

override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        CoroutineScope(Dispatchers.IO).launch {
            delay(2000)
            while (true) {
                for (i in 1..batteriesRepo.model.batteryNumber) {
                    try {
                        val sendReadTemperatureCommand = appMaintenanceRepo.sendReadCommandData(i)
                        val data = sendReadTemperatureCommand.data
                        batteriesInfoModel = appMaintenanceRepo.parseFinallyDataToUseAllBatteriesInfo(data, sendReadTemperatureCommand.slaveId)
                    } catch (e: ModbusRespException) {
                        Tracker.serialPortErrorLog("通道:" + i + " 读取电池信息失败:" + SerialPortResultCode.getErrorMessage(e.exceptionCode.toInt()) + " 寄存器开始地址:" + startRegister0x1000 + " 寄存器数量:" + register0x1000Count)
                        batteriesInfoModel = ReadOnlyRegisterModel().apply { batteriesStorageIndex = i }
                    } catch (e: ModbusTransportException) {
                        LogUtils.e("读取信息失败：" + e.slaveId)
                        batteriesInfoModel = ReadOnlyRegisterModel().apply { batteriesStorageIndex = i }
                    }
                   //这里需要将原始数据进行保存
                    Realm.getDefaultInstance().apply {
                        beginTransaction()
                        copyToRealmOrUpdate(batteriesInfoModel)
                        commitTransaction()
                        close()
                    }
                }
                delay(100)
            }
        }
        return START_STICKY
    }

我看了其他 的issues，你说不能一次读太多的寄存器，那最大能承受多少