3.4 CONFIGURATION SWITCH SETTINGS
The MSD-4C is configured prior to shipping with the Dip Switches set as follows:
1) Anti-Streaming -
Disabled
2) TEXT / GRAPHICS -
TEXT Mode
3) Frame / Signal Ground -
Not Connected
4) Control Signals - Passed straight
5) Data Rate - 9.6k
If your system application requires one or more of the default setting to be changed, it
will be necessary to remove the top cover of the MSD-4C.
Remove the AC Power
source or Disconnect the AC Power before servicing the unit.
Removal of the top
cover is accomplished by using a small Philips screwdriver and removing the four
outside screws. After setting the switches, replace the top cover
before applying AC
power.
3.5 MODEM (DCE) AND TERMINAL (DTE) CONNECTION
Before applying AC Power to the unit, the DCE and DTE cabling should be connected.
Straight through Male to Male DB-25 shielded cables, no longer than 50 feet in any
direction should be used. If your cables are not shielded or over 50 feet long,
transmission errors are very likely.
3.6 ASCII STRING COMMANDS FOR SWITCHING
3.6.1 TEXT OR GRAPHICS MODE COMMANDS
When the user sets the MSD-4C in the
Text Mode
or
Graphic Mode
of operation, the
user commands issued from a computer to switch between the sub-channel ports are
the same for either mode. The ASCII control codes are send from the users computer
or embedded into the serial data stream as follows:
(Sub-Channel 1) Crtl D, 00
(Sub-Channel 2) Crtl D, 01
(Sub-Channel 3) Crtl D, 02
(Sub-Channel 4) Crtl D, 03
MSD-4C INSTALLATION AND OPERATIONS MANUAL
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