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);
}