Appendix F How to use the Checksum feature F-3
Appendix F
Example 2
This example explains how to calculate the checksum value of a Read
High alarm limit command string:
Case 1. (If the Checksum feature is disabled)
Command: $07RH(cr)
Response: !07+2.0500(cr) when the command is valid.
Case 2. (If the Checksum feature is enabled)
Command: $07RH25(cr)
Response: !07+2.0500D8(cr)
where:
25 represents the checksum of this command, and
D8 represents the checksum of the response.
The checksum of the command string is derived as shown below:
25h = (24h+ 30h + 37h + 52h + 48h) MOD 100h
The hexadecimal ASCII codes for $, 0, 7, R, H are 24h, 30h, 37h, 52h and
48h respectively. The sum of these ASCII codes is 125h. The module-
256(100h) sum of 125h is 25h.
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