Chapter 5 - Synchronous Mode Operation
5-1
Chapter 5 - Synchronous Mode Operation
This chapter introduces you to the use of the Omni 288S for synchronous
operation. The modem can be used as a synchronous modem when it is connected
to a synchronous computer or terminal. It is of course necessary to make sure that
the remote modem and system are also set to synchronous. Synchronous operation
applies to all of the non-FSK modes the modem is supplied with. Before
synchronous transfers are started, some initial settings should be made.
V.25bis Command Set
To enable V.25bis commands use the AT*I1 command.
For synchronous applications, the modem is permanently set in normal situations
for use with one application. Save the desired settings in the power-on profile,
and the modem will be initialized to synchronous mode (&M3) with V.25bis
command enabled (*I1) when turned it is turned on.
A special command RST is provided to get the modem back to asynchronous AT
command mode from V.25bis mode. You can enter this RST command in either
synchronous or asynchronous V.25bis mode.
Syntax
Command with Parameters*
Description
CRN
CRN <dialstring>**
Call request with number provided.
CRS
CRS n
Call request with number from
memory, 0 # n # 49;
n is the memory location.
PRN
PRN n; <number>
Saves <number> to address n
(0 # n #49).
RLN
RLN***
Requests list of all stored numbers.
DIC
DIC
Ignores incoming call.
CIC
CIC
Accepts incoming call.
CFI
CFI XX
Call failure indication:
ET Engaged Tone.
NS Number is not stored.
RT RING Tone.
AB Abort Call.
NT Answer Tone is not detected.
INC
INC
Incoming call.
VAL
VAL
Valid.
INV
INV
Invalid.
LSN
LSN n; <number>
List of stored numbers.
(Response to RLN)
RST
RST
Changes to the asynchronous
AT command mode.
