Axel AX4000 User's Manual Manuel d'utilisateur télécharger pdf (Page 83)

Appendix

AXEL Office Server 77

1 - If no carrier is detected (CD signal is down), the HAYES reset and init

sequences are sent to the modem in the following cases:

- the Office Server is powered up when the modem is already switched on,

- the modem is power-cycled,

- the call is terminated,

- the serial line is reset when the modem is already switched on.

2 - The HAYES init sequence is sent 2 seconds after the HAYES reset

sequence.

3 - When an Office Server network service opens a TCP/IP connection, the

Office Server dials the modem (ATD+phone number) if a carrier is detected (CD

signal is down).

4 - The Office Server detects the modem presence, either by a signal (DSR or

CTS) from the modem, or by the modem responding OK (or 0) when the Office

Server sends it an AT sequence.

5 - The Office Server can terminate a call (network service ended or inactivity

on line) by using the RTS or DTR signals or by using a HAYES sequence.

6 - You MUST use a handshake protocol. Hardware handshaking (RTS/CTS) is

better than software (XON/XOFF) flow control.

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Axel AX4000 User's Manual Manuel d'utilisateur Page 83