Power Connection; Current Loop Interface (Optional); Composite Video (Optional) - Beehive International B150 Series Operator's Manual

nate operating positions without removing or
changing any wiring. Select a convenient, level sur-
face and place the terminal where the power cable
and data 1/0 cables will not be in the way of the
perator. Route the cables in such a manner that
they will not be inadvertently pulled or disturbed
by minor changes in terminal position or by working
personnel. Position the terminal so that operator
use will be as convenient as possible.
CAUTION:
Do not place the terminal on any
surface that will block cooling air from the
bottom or back of the cabinet. The terminal is
provided with an internal fan for
coolin~
Air
enters through slots in the bottom and out of
slots provided in the rear of the terminal case.
To maintain efficient air circulation, keep at
least two inches of clearance at the rear and on
the sides of the terminal (see Figures 2-1Aand
B~
2. 7 .2 Power Connection
The terminal is shipped with a three-conductor
power cord which grounds the instrument through
the offset pin. The safety feature of this ground
should always be preserved by grounding the unit
to the outlet box or other earth ground. If it is
necessary to use an adapter, ground the pigtail.
. . . . 1.f------
22.25"
- - - - - . i
2.7
3
Current Loop Interface (Optional)
The Current Loop Interface is a 20 mA device
which allows the terminal to be used up to 2000
feet (608 m) from the computer. If shielded,
twisted pairs are used, the terminal may be
located up to 6000 feet ( 1.8 km) away if
utilized at slower baud rates. Interface consists
of a 2-wire source, a 2-wire receive data line,
and a 2-wire transmit data line.
Data transmission is normally limited to 50 feet.
The Current Loop adaptor converts the TTL
logic into current or voltage patterns at one end
of the loop, transmits the pattern, reconverts
the pattern to TTL logic at the other end, and
delivers it to the computer or terminal. The
current loop signals are contained within the
RS232C 1/0 connector and will not interfere
with normal RS232C signals required for asyn-
chronous operation. See Table 2-1 for location
of pin assignments and Figure 2-2 for cabling.
2.7.4 Composite Video (Optional)
The
B
150 series unit is provided with a composite
video device capable of driving a remote monitor
up
Allow At Least 2 Inches
Clearance
~19"~
56.5 cm
Allow at least 2 inches clearance
48.3 cm
Figure 2-1A B150/B157 Mounting Requirements
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Figure 2-18 B152 Mounting Requirements
2-2
CLEARANCE