NCR 7870 manual RS-232 Communications Options, Normal or Eavesdrop Mode, Message Delay

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.