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Data reversed

See original GitHub issue

I use Modbus Slave to simulate slave, but I get reverse data. Slave Log

000070-Rx:00 00 00 00 00 06 01 03 00 00 00 0A 
000071-Tx:00 00 00 00 00 17 01 03 14 01 09 01 83 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
000072-Rx:00 01 00 00 00 06 01 03 00 00 00 0A 
000073-Tx:00 01 00 00 00 17 01 03 14 01 09 01 83 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Master code

        static void Fluent()
        {
            var client = new ModbusTcpClient();
            client.Connect(IPEndPoint.Parse("127.0.0.1:502"));
            var d1 = client.ReadHoldingRegisters<ushort>(1, 0, 10);
            Console.WriteLine(string.Join(";", d1.ToArray().Select(BitConverter.GetBytes).Select(c => BitConverter.ToString(c)).ToArray()));
            Console.WriteLine(string.Join(";", d1.ToArray()));

            var d2 = client.ReadHoldingRegisters(1, 0, 10);
            Console.WriteLine(BitConverter.ToString(d2.ToArray()));
            Console.WriteLine(string.Join(";", d2.ToArray()));

            client.Disconnect();
        }

Master output

01-09;01-83;00-00;00-00;00-00;00-00;00-00;00-00;00-00;00-00
2305;33537;0;0;0;0;0;0;0;0
01-09-01-83-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
1;9;1;131;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0

Slave send	Master output
265(0x0109)	2305(0x0901)
387(0x0183)	33537(0x8301)

I tested it in NModbus, it works correct. NModbus code

        static void NModbus()
        {
            using var tcpClient = new TcpClient();
            tcpClient.Connect(IPEndPoint.Parse("127.0.0.1:502"));
            using var client = new ModbusFactory().CreateMaster(tcpClient);
            var d = client.ReadHoldingRegisters(1, 0, 10);
            Console.WriteLine(string.Join(";", d.Select(BitConverter.GetBytes).Select(c => BitConverter.ToString(c)).ToArray()));
            Console.WriteLine(string.Join(";", d));
        }

NModbus output

09-01;83-01;00-00;00-00;00-00;00-00;00-00;00-00;00-00;00-00
265;387;0;0;0;0;0;0;0;0

Issue Analytics

State:
Created 4 years ago
Comments:5 (3 by maintainers)

Top GitHub Comments

2reactions

Apollo3zehncommented, Aug 6, 2020

Sorry for my late reply. I have released a new version that allows to specify the data layout (big-endian vs little-endian).

Example:

var client = new ModbusTcpClient(..., ModbusEndianness.BigEndian);

When you specify this layout, all data will be reversed automatically.

I´ll close this issue for now as it should be resolved. If you have further issues, feel free to reopen it.

0reactions

Apollo3zehncommented, Apr 4, 2020

Thanks for your feedback. Unfortunately I don’t have much time right now, but I`ll try to fix it next week.

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