Table of Contents
Advertisement
To answer an incoming HDLC call issue "at:m112=32A".
If the MultiAccess is to answer a standard analog data modem call, the answer command would simply be
"ata" (including the Call Type index is NOT needed because Data Modem is the default call type).
For outbound calls, the Call Type index can be issued on a separate string, preceeding the dial string, or it can
preceed the dial command as part of the same string.
If the MultiAccess is to dial out (originate) to a remote ISDN Terminal Adapter in HDLC mode, the
initialization sequence would be as follows:
Configuration String = ate1q0:m112=32
Dial String = atdtPHONENUMBER
Or Together = atq0:m112=32dtPHONENUMBER
The possible values of the Call Type index (:m112=n) are as follows:
POS
= 2 (answer mode only)
Data Modem
= 4 (default)
ISDN V110
= 8
ISDN PIAFS
= 16
ISDN HDLC
= 32
POS V22 Direct
= 64 (answer mode only)
CALL TYPE DEFINITIONS:
POS (Point of Sale) = The standard modulation handshake sequences will be used to establish carrier. The
modem will be incapable of negotiating LAPM or MNP error correction. POS call Type is supported in the
answer role only. The modem will connect in asynchronous mode (non -framed).
Data Modem = This is the default call type. Standard analog modem modulations (PCM) apply (i.e. V.92, V.90,
V.34. V.32 etc). The modem will auto negotiate modulation protocols starting at V.92 and working down to Bell
103 along with auto negotiating error control protocls of LAPM or MNP and data compression protocols of V.44,
V.42bis or MNP5. The modem will connect in asynchronous mode (non -framed).
ISDN V110 = V110 framed data operating directly on digital DS-0 channel. Auto rate-adaption of 19.2 kbps or
slower. Associated with wireless calls.
ISDN PIAFS = A framed protocol operating directly on digital DS-0 channel for use in Japan. Associated with
wireless calls.
ISDN HDLC = HDLC framed data operating directly on digital DS-0 channel at 64kbps.
POS V22 Direct = The connection is limited to V.22bis, V.22, Bell212, V.21 or Bell103. The modem will be
incapable of negotiating LAPM or MNP error correction. This call type is supported in the answer role only.
If the calling POS terminal is operating in synchronous SDLC mode, the port will detect the incoming flags
(octet code 0x7E) and enter SDLC framed data transfer mode. Otherwise, the modem will enter asynchronous
mode (non -framed). This call type allows the host to control many of the modulation handshake timing and
operating parameters. Please see the POS V22 Direct Commands section later in this appendix regarding
these additional parameters.
PLEASE NOTE: It is not necessary to change the Call Type index when using the modem to send or receive a
FAX. The modem will switch to the appropriate FAX mode (Class 1, 1.0, 2 and 2.0) via standard +FCLASS=#
commands.
However it is still necessary to include the +FCLASS=# command when answering an incoming FAX (for
example at+fclass=2.0A).
FAX = Half duplex analog communication, incorporating multiple modulation protocols, transferring facsmile
specific data. The MA30120 modems support Fax modes, Class 1, Class 1.0, Class 2 and Class 2.0.
Asynchronous Data Handling
MultiAccess Communications Server MA30120 User Guide
Appendix B – Modem Commands
153
Advertisement
Table of Contents
