public async Task FC06Test() { // Arrange var endpoint = EndpointSource.GetNext(); using var server = new ModbusTcpServer(); server.Start(endpoint); var client = new ModbusTcpClient(); client.Connect(endpoint); // Act await client.WriteSingleRegisterAsync(0, 02, 259); await client.WriteSingleRegisterAsync(0, 10, 125); await client.WriteSingleRegisterAsync(0, 11, 16544); await client.WriteSingleRegisterAsync(0, 12, 4848); // Assert var expected = new short[] { 0, 0, 259, 0, 0, 0, 0, 0, 0, 0, 125, 16544, 4848 }; lock (server.Lock) { var actual = server.GetHoldingRegisterBuffer <short>().Slice(0, 13).ToArray(); Assert.True(expected.SequenceEqual(actual)); } }