The Operator's Keyboard; The Engineer's Keyboard; The Local Control Network - Honeywell Enhanced Micro TDC 3000 User Manual

1.1.3

1.1.3 The Operator's Keyboard

The Operator's Keyboard (Figure 1-3) is a flat, chemically resistant, membrane keyboard
installed in a metal frame, placeable by the operator, and connected to the keyboard
connector on the transition panel. A three-function annunciator horn is built into these
keyboards.
Unmarked keys on the left side of the operator's keyboard may be configured by the user
(or, perhaps, be preconfigured at the factory). An insert sheet is available that is placed
between the outside protective membrane and the keyboard electronics. To replace or
install a new insert, remove the two corner screws beneath the metal frame. Lift the frame
from the keyboard assembly, grasp the plastic insert using the thumb-slot at the top of the
keyboard and remove it. Replace it with the new insert. Reassemble the keyboard and
frame, then install and tighten the two corner screws.
Additional operator's keyboards are supplied with optional Universal Stations.

1.1.4 The Engineer's Keyboard

At least one engineer's keyboard (Figure 1-3), similar in design to a personal computer
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 3000 X 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 TDC 3000 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.
Enhanced Micro TDC 3000 User's Manual 1-6 9/95