TDC‑3000 BASIC,AM Application Module CPU,51401551‑400,K2LCN‑4

keyboard, will be connected to the system. The engineer’s keyboard is especially designed
so that it may be disconnected and/or reconnected while the system is in operation. This
way, the keyboard may be removed when an engineer wishes to deny operator access to
special engineering functions, or the engineer may carry “his” keyboard to any operating
system.
To connect this keyboard, insert the plug on its cable into the small connector located on the
side of the operator’s keyboard. Note that the plug will only fit one way.
An engineer’s keyboard is optionally available, but not supplied with, the optional second,
third, or fourth Universal Station.
1.1.5 The Local Control Networks
All the nodes in both towers communicate with each other through the TPLCN (Twisted
Pair Local Control Network) data communications network, using the RS-485
communications interface standard. This network is similar to the LCN (Local Control
Network) used in other TDC 3000X equipment, but the noncoaxial RS-485 (twisted pair)
network has been chosen here because of its simplicity and the short physical distances
between nodes.

High-speed serial data is passed between nodes at 5 megabits per second (mega = million)
and follows a token-passing protocol. This protocol is identical to that used on the LCN.
There is a user-installed kit that connects the base Enhanced Micro TDC3000 to a standard
LCN system. The kit includes an LCN cabinet that accommodates 4 or 6 empty chassis; a
fan module, power supply, and I/O card for each chassis; Winchester Disk Adapter (WDA)
Module; and History Module. Refer to subsection 2.9 for additional information on the
LCN upgrade.
1.2 OPERATING PRACTICES AND HOUSEKEEPING
Listed here are some do’s and don’ts pertaining to operating practices and general housekeeping
that should be followed during startup and normal everyday operations.
1.2.1 Before Startup
1. Thoroughly clean all operating areas, subfloor areas, cable raceways, heating and air
conditioning ducts, and plenums.
2. Make sure that all control-room windows are sealed.
3. Place impregnated mats at each entrance to a control area to prevent dirt and dust from
being tracked in.
4. Provide a coat rack and/or closet outside the operating area for removal of any outer
clothing made of nylon or other synthetic fabrics, except where flame-retardant
uniforms are mandatory at all times.
5. Make sure that the furniture and carpets are not made of materials that can combine with
clothing to create static electricity.
6. Prepare a regular cleaning schedule for specific area requirements and for cleaning of
consoles, cabinets, and peripheral devices where necessary. (Caution: Do not attempt
to clean the printed-wiring boards themselves.)
7. Establish a “no-smoking” rule in the operating area. Smoke and other fine dust
particles can damage cartridge disks and drives.
8. When swapping or handling printed-circuit cards, use a static-control device, such as a
wrist strap; see Circuit Card Handling, subsection 1.3 of this manual