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Chapter 7: Programming 7-49
RS-232 Communications Options
The RS-232 Communications Options parameters control the delay
between messages, and the format in which the scanner and host
terminal exchange tag data messages. The firmware is programmed to
accept one parameter at a time and then leave this programming mode.
Therefore, each of the parameters must be programmed separately.
Defaults
Parameter Default Value
Message Delay 10 millisecond Delay
Scanner or Scanner/Scale Format Determined by Model
Normal or Eavesdrop Mode Normal Mode
Beep at Scale Weight Transmission No Beep
Specific Program Parameters
Normal or Eavesdrop Mode
The normal mode is used for most RS-232 connections. However, an
eavesdrop mode is available to permit another device to monitor the
communications between the NCR 7875 and the host terminal. Scan
the Hex 6 tag to select the normal mode or the Hex 7 tag to select the
eavesdrop mode.
Message Delay
The Message Delay option permits you to choose the minimum time
the firmware waits before sending the next message. This permits
lowering CTS by the host terminal to inhibit data from the scanner. On
previous scanners this option was not available.
Previous to firmware numbered 497-0301951 the delay between
messages was zero milliseconds. This did not permit the terminal to
lower CTS to prevent a second message from being sent to the scanner.