public async Task TestULong() { var factory = new ModbusFactory(); IModbusMaster modbus = factory.CreateMaster(_client); await _client.ConnectAsync(MODBUS_IP, MODBUS_PORT); ulong?data = await modbus.ReadULongAsync(MODBUS_SLAVE, 0); Assert.NotNull(data); await modbus.WriteULongAsync(MODBUS_SLAVE, 0, 2000000); data = await modbus.ReadULongAsync(MODBUS_SLAVE, 0); Assert.NotNull(data); Assert.Equal((ulong)2000000, data); await modbus.WriteULongAsync(MODBUS_SLAVE, 0, 0); data = await modbus.ReadULongAsync(MODBUS_SLAVE, 0); Assert.NotNull(data); Assert.Equal((ulong)0, data); data = await modbus.ReadOnlyULongAsync(MODBUS_SLAVE, 0); Assert.NotNull(data); }