User manual

Chapter 2. Installation
61202156L1-1 TDU 120e User Manual 2-9
Chain In/Chain Out
TDU 120e units and other TDUs and TSUs can be linked
together to form a chain. Figure 2-3 shows an example of a
chain-in arrangement with a PC or a modem. The first TDU
120e in the chain receives controlling input from the PC or
modem.
Figure 2-3. Example of Chain-in
Subsequent TDU/TSUs in the chain are in a position to
intake information from another TDU or TSU. This intaking
of information from another TDU in the chain is identified as
Chain In. The baud rate for the chained units must match
that of the first unit.
Unless locked out externally, the front panel can also control
the unit.
At this point, the Unit Initialization procedure is concluded.
If the unit is to be configured remotely, there are no
additional items necessary to complete prior to executing
remote configuration.
The Passcode, the Unit ID, and the Control Port settings are
stored in a nonvolatile memory. This ensures they are
operable for subsequent power-up sequences.
TDU 120e
PC or Modem
Control
Input
Chain
Out
TDU 120e /
TSU 100/TSU
Chain
In
Chain
Out
TDU 120e /
TSU 100/TSU
Chain
In
Chain
Out