CALL METERING SERVICES APPLICATIONS
Ed. 0414/30 Réf. 3EH 21000 BSAA
FUNCTION OF THE BUFFER MEMORY
This is used to temporarily store the different messages (output terminal not available, several simul-
taneous messages, etc.).
The maximum number of tickets or statements that can be stored is 1000.
Alarm activation threshold
T percentage of tickets or statements printed before the alarm is activated (between 0% and 99%:
70% by default)
As soon as the programmed threshold has been reached, an alarm is generated alerting the user
(message in the call history + flashing of the operator LED).
When the buffer memory is full, any new information is lost.
XON/XOFF TRANSMISSION PROTOCOL
When the printer is ready to print, it transmits an XON control character. The data received is stored
on a buffer. If there are only a certain number of bytes available on this buffer, the printer will transmit
XOFF. It continues to receive characters and print before transmission halt. When part of the buffer is
released, it transmits XON. The printer also transmits XOFF in the event of the following problems:
printer off-line, no more paper, paper jam, etc.. It transmits XON when these problems have been re-
solved.
Notas : The printer DTR signal is connected to the interface CTS signal if XON is not received.
- By MMC-PM5 (Expert View), select: Metering -> Metering -> Printouts -> Printer alarm
threshold
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