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Chapter 2 - Configuration
The data port in this configuration will be set up for synchronous operation. To configure the data
port for sync operation, enter 1 (Aysnc/Sync) option and change the default Async to Sync. The
data port configuration menu displays the sync parameters.
Data Port Configuration
1 - Async/Sync: Sync
2 - Speed: 19200
3 - Clocking: Internal
4 - Idle Condition: Flags
5 - NRZ/NRZI Encoding: NRZ
6 - CRC Preset: All 1s
7 - Inter-frame Timer: Off
S -
Store All Configuations
M - Main Menu
P - Previous Menu
Selection : _
Enter 2 and press ENTER to set the speed of the sync data port. Select the appropriate speed
by entering its menu list number. The speed you select should be no faster than the composite
link speed. At the sync data port configuration menu, determine who is supplying the clocking.
The default internal clocking allows the DataTalker to supply the clock. Enter the letter S to store
all configurations and then press P to return to the previous menu.
For configuration 2, where both sites have a telephone connected to the DataTalker, initially
accept the defaults for the second choice in the Configurations menu, Voice/Fax Channels
Configuration.
At the Configurations menu, enter 3 and press ENTER to display the Composite Link Settings
menu.
The DataTalker detects the type of link device being used from the way a DIP switch is set or by
reading the device when it is installed on the main PC board. In this configuration, a 56K bps
internal DSU is being used as the composite link device. So, when the internal composite link
settings menu is displayed, it is for a DSU:
Composite Link Settings - Internal DSU
1 - Speed: 56k
2 - Clocking: DDS
S - Store All Configurations
M - Main Menu
P - Previous Menu
Selection : _
The internal DSU has two options: speed and clocking. The speed option should match the DDS
line speed. The clocking option depends on how you have set up your link with the telephone
company. If the link is set up as a DDS link, use the default DDS setting. If the link is set up for
the DataTalker to provide the clocking, change the clocking option to Internal.
This completes the configuration of both DataTalkers. Disconnect the data/command port from
the terminal or PC and connect it to the composite link of the MMH904. Place DIP switch position
3 on both DataTalkers in the up (OPEN) position to change the data/command port over to a data
channel.