Axel AX4000 User's Manual - Manual (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.