title: Getting different LRC (Long Range Checksum) result
body: <p>I'm trying to send a request to a TCP/IP terminal. My LRC function as below:</p>
  <pre><code>public byte GetLRC(byte[] bArr)
      {
          byte LRC = 0x00;
          foreach (byte b in bArr)
          {
              LRC ^= b;
          }
          return LRC;
      }
  </code></pre>
  <p>But the problem is my LRC and their sample LRC are totally different. How can they calculate this?</p>
  <p>My message data request is almost the same as their except the LRC.</p>
  <p>Sample data:</p>
  <p>Hex: <code>0 66  30  30  30  30  30  30  30  30  32  34  31  30  33  30  30  31  30  1C  54  32  0   2   30  31  1C  34  33  0   1   30  1C  34  30  0   12  30  30  30  30  30  30  30  30  30  30  30  31  1C  34  32  0   12  30  30  30  30  30  30  30  30  30  30  30  30  1C  79</code></p>
  <p>Bytes:</p>
  <pre><code>{byte[68]}
  [0]: 0
  [1]: 102
  [2]: 48
  [3]: 48
  [4]: 48
  [5]: 48
  [6]: 48
  [7]: 48
  [8]: 48
  [9]: 48
  [10]: 50
  [11]: 52
  [12]: 49
  [13]: 48
  [14]: 51
  [15]: 48
  [16]: 48
  [17]: 49
  [18]: 48
  [19]: 28
  [20]: 84
  [21]: 50
  [22]: 0
  [23]: 2
  [24]: 48
  [25]: 49
  [26]: 28
  [27]: 52
  [28]: 51
  [29]: 0
  [30]: 1
  [31]: 48
  [32]: 28
  [33]: 52
  [34]: 48
  [35]: 0
  [36]: 18
  [37]: 48
  [38]: 48
  [39]: 48
  [40]: 48
  [41]: 48
  [42]: 48
  [43]: 48
  [44]: 48
  [45]: 48
  [46]: 48
  [47]: 48
  [48]: 49
  [49]: 28
  [50]: 52
  [51]: 50
  [52]: 0
  [53]: 18
  [54]: 48
  [55]: 48
  [56]: 48
  [57]: 48
  [58]: 48
  [59]: 48
  [60]: 48
  [61]: 48
  [62]: 48
  [63]: 48
  [64]: 48
  [65]: 48
  [66]: 28
  [67]: 121
  </code></pre>
  <p>My data:</p>
  <pre><code>0   66  30  30  30  30  30  30  30  30  32  34  31  30  33  30  30  31  30  1C  54  32  0   2   30  31  1C  34  33  0   1   30  1C  34  30  0   12  30  30  30  30  30  30  30  30  30  30  30  31  1C  34  32  0   12  30  30  30  30  30  30  30  30  30  30  30  30  1C  1F
  
  {byte[68]}
  [0]: 0
  [1]: 102
  [2]: 48
  [3]: 48
  [4]: 48
  [5]: 48
  [6]: 48
  [7]: 48
  [8]: 48
  [9]: 48
  [10]: 50
  [11]: 52
  [12]: 49
  [13]: 48
  [14]: 51
  [15]: 48
  [16]: 48
  [17]: 49
  [18]: 48
  [19]: 28
  [20]: 84
  [21]: 50
  [22]: 0
  [23]: 2
  [24]: 48
  [25]: 49
  [26]: 28
  [27]: 52
  [28]: 51
  [29]: 0
  [30]: 1
  [31]: 48
  [32]: 28
  [33]: 52
  [34]: 48
  [35]: 0
  [36]: 18
  [37]: 48
  [38]: 48
  [39]: 48
  [40]: 48
  [41]: 48
  [42]: 48
  [43]: 48
  [44]: 48
  [45]: 48
  [46]: 48
  [47]: 48
  [48]: 49
  [49]: 28
  [50]: 52
  [51]: 50
  [52]: 0
  [53]: 18
  [54]: 48
  [55]: 48
  [56]: 48
  [57]: 48
  [58]: 48
  [59]: 48
  [60]: 48
  [61]: 48
  [62]: 48
  [63]: 48
  [64]: 48
  [65]: 48
  [66]: 28
  [67]: 31
  </code></pre>
  <p><a href="https://i.stack.imgur.com/to5ES.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/to5ES.png" alt="enter image description here" /></a></p>