7-46 Chapter 7: Programming

Program Example

Following is an example of a completed RS-232 Prefix Byte programming worksheet. This example shows the Prefix Byte enabled, and ASCII Code STX (02 Hex) transmits as the leading character of each message sent to the host terminal.

Your Program

2 2

RS-232

Prefix Byte

A

1

Prefix Byte

B

0 2

ASCII

Code

R0074

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NCR 7870 manual RS-232 Prefix Byte