Ericsson ZAT 19.2 Operation Manual page 231

10.2.4 Requirements on the Data Terminal:
A data terminal to be used in Synchronous Mode 1 must be
able, in synchronous mode as well as in asynchronous mode, to
communicate through the same physical V.24 port. It must also
allow software controlled change-over between synchronous
mode and asynchronous mode. If an available DTE does not
fulfil these requirements, an asynchronous DTE can be used as
long as the modem is in the command state (during connecting-
up ). When connection is completed, the V.24 cable between the
DTE and the modem can be moved to a synchronous DTE. The
time available for the operator to reconnect is set by the S25
register. The unit for S25 when operating in Synchronous mode
1 is seconds. In synchronous mode 2 and 3 the unit is 100ms.
10.2.5 Disconnecting.
The modem disconnects if carrier is lost for a tonger period than
set by register S10. Default 0,1 second. The modem may also
be disconnected by turning DTR OFF or by the display menu.
10.2.6 Dumb mode
Dumb mode is intended to be used when the modem must
ignore commands or the terminal is a dedicated synchronous
DTE. Dumb synchronous mode must be selected using the
Display menu. Refer to menu description C011 and C016.
10.2.7. DTR control
The modem can be programmed for 108.1 or 108.2 using the
display menu.
10.2.8 108.1 control
Selecting 108.1 control will cause the modem to disconnect if
DTR changes from ON to OFF and to disable autoanswer when
DTR is OFF. A call or an answer procedure is initiated when
DTR changes from OFF to ON when off-line. Refer to menu
description C028, C029 and C027.
10.2.9 108.2 control
DTR off to on transition can not be used for initiating a call or
answer procedure when using 108.2 control. This mode will only
define how to handle OTR on to off. Refer to menu description
C026. if DTR on to off response is set to DISCONNECT then
autoanswer will be disabled when DTR is OFF. DTR OFF to ON
transition is ignored.
LZTR104006 R1.00 10-3
Zat 14.4/14.4-7 and 19.2/19.2-7