Programming instructions

Intermec Fingerprint v7.61 – Programmer’s Reference Manual Ed. 7 55
Chapter 2 Program Instructions
CSUM
Field of Application Statement calculating the checksum of an array of strings.
Syntax CSUM<ncon>,<svar>,<nvar>
<ncon> is the type of checksum calculation:
1: Longitudinal Redundancy Check (LRC)
XOR in each character in each string
array[0][0] xor array[0][1] ... array[n][n]
2: Diagonal Redundancy Check (DRC)
right rotation, then XOR on each character in each
string
rot(array[0][0] xor array[0][1]
3: Longitudinal Redundancy Check (LRC)
Strip string of DLE (0x10) before doing the LRC
<svar> if <ncon> =1 or 2: The array of strings of which the checksum
is to be calculated.
if <ncon> = 3: Checksum string.
<nvar> is the variable in which the result will be presented.
Remarks
These types of checksum calculation can only be used for string arrays,
not for numeric arrays. In case of CSUM 3,<svar>,<nvar>, the resulting
variable will be the indata for next CSUM calculation, unless the
variable is reset.
Example In this example, the DRC checksum of an array of strings is calculated:
10 ARRAY$(0)="ALPHA"
20 ARRAY$(1)="BETA"
30 ARRAY$(2)="GAMMA"
40 ARRAY$(3)="DELTA"
50 CSUM 2,ARRAY$,B%
60 PRINT B% :REM DRC CHECKSUM
RUN
yields:
252