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Chapter 2. Installation
2-10 TDU 120e User Manual 61202156L2-1
Chain In (PC)
The unit can be controlled from an external PC connected
directly or via modem to the Chain-In port. When using
Chain-In, the selection of the Control Port baud rate from
9600 (factory default), 1200, 2400, or 4800, 19200, or 38400
must be made using the U
NIT
C
ONFIGURATION
menu. See
Unit Menu on page 5-14 for details.
Chain In/Chain Out
TDU 120e units and other TDUs and TSUs can be linked
together to form a chain. Figure 2-3 provides 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 in-
take information from another TDU or TSU. This in-tak-
ing 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 con-
trol the unit.
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