Visara LINCS Features - Manual (Page 43)

33
Chapter 5. Host Connectivity
707021-001
There are three different types of panels that are part of the ASCII Dial panels:
• Modem Phone Number Panel: Allows you to enter User IDs and host telephone numbers.
You may also define a call back number, if the Call Back Security Feature is to be used. Up
to 96 phone numbers can be entered. Each entry is identified as either a host number or a
User ID number. (Be sure to end the dial string with a CR character if necessary or the
string will not be sent.)
• ASCII Modem Dial Panel: Allows you to enter modem dial strings on a per port basis.
The dial string will be sent just prior to a phone number when LINCS is dialing for you, either
Host dial or Dial Back. An example of this is the ATDT string required by Hayes modems.
• ASCII Modem Init Panel: Allows you to enter another type of initialization string that is
required of some modems when they power on. An example of this is if you wish to put the
modem in auto answer mode. LINCS will send this string every time the modem powers on.
From an ASCII host session, you can access the Modem Phone Number panel by pressing the
Dial Panel key (initially assigned to the Clear key). From a 3270 host session, you can access
the Modem Phone Number panel by pressing the Extended Select key and then the Clear key.
With dialback, when the user ID and the password have been correctly entered, LINCS
prompts the user to hang up or go “off hook”. When DSR and CD drop on the modem,
indicating that the user has hung up, LINCS waits eight seconds, then dials back the user
based on the user ID, the telephone number, and the modem initialization string configured
on the Dial panel. LINCS prompts again for the user ID, and the user enters the string again.
If the string does not match the previous entry, access is denied and the port is made available
for entry by another user.
If the modem attached to LINCS cannot get a dial tone, gets a busy signal, or if the call is not
answered within five seconds, LINCS assumes the user has powered off the device, and makes
the port available for access by another user.
ASCII Passthrough
ASCII Passthrough passes virtually all key sequences to and from an ASCII device to an
ASCII host unmodified. Only two key sequences are not passed:
• Setup Mode key sequence, used to enter ASCII Setup Mode
• Session Switch Key, used to switch between configured sessions
Optional key sequences may also be defined, using the ADU, to provide the following functions:
• Dial Screen key sequence, used to access the Dial Screen
• Zoom key sequence, used to zoom in on a windowed session while in an ASCII session.
ASCII Passthrough also allows the device to operate at a different baud rate than the host’s
baud rate. LINCS also allows the device to emulate a different ASCII device. For example, a
Wyse 50 can appear as a VT100 terminal to a DEC host.
Please observe the following cautions when switching to or from an ASCII Passthrough session:
• If an ASCII device supports Block Mode types of operation in passthrough mode, the device
must exit Block Mode, and return to Character Mode before switching sessions.
• LINCS does not keep track of screen data in passthrough mode, so you will have to refresh
the screen after switching back to an ASCII passthrough session. See ASCII Passthrough
under ASCII Displays in the chapter on CUT Devices for additional information.