A limit and range check is simply a maximum or minimum number for a record. For example, the number of days worked in a week cannot exceed 7.
A record count counts the number of records processed.
Echo check is the process of sending the received data back to the sending computer to compare with what was actually sent to make sure that it is the same. For example, a CPU will send a signal to the printer, and the printer, prior to printing, will send a signal back to the CPU stating that the proper print position has been activated.
A check digit is used for determining whether a number has been input properly. A check digit is a digit (for example, the last digit in a series of numbers) that is a function of the other digits within the set of numbers. If a typographical error is made in input, the check digit should recognize that something has been input incorrectly because the check digit won't "check." This would only work with numbers that can be known in advance, however, such as part numbers or account numbers, so that the check digit checking process could be properly programmed and the numbers could be assigned correctly. Payment amounts can be any amount at all, and there would be no way to use a check digit with that because there would be nothing to check against.
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