Introduction - IBM Series 1 User Manual
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Also See for Series 1:
- Quick installation manual (2 pages) ,
- User manual (114 pages) ,
- Manual (198 pages)
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CHAP~ ~~
TELETYPEWRITER ADAPTER
FE!IQB~
INTRODUCTION
Figure 4-1 is a block diagram of the teletypewriter
adapter
feature.
This
feature
is
designed primarily to attach a
teletypewriter I/O device to the processor I/O channel.
The
adapter
may
also
be
used
to
attach
other devices that
satisfy the requirements
of
the
interface.
The
feature
offers
signal
and
bit rate selectability by
(1)
using the
appropriate pins of a
16-pin
top-card
connector
and
(2)
jumpering of pins on the feature card.
The
teletypewriter
adapter
feature
has
a
4-wire
interface
for
data
exchange--2
for
receive
and
2
for
transmit.
Operation is full duplex; that is,
data
may
be
concurrently transmitted and received.
The
in£~1
options offered are:
•
Isolated contact sense
Open circuit=mark (logical one)
Closed circuit=mark
•
Non-isolated contact sense
Open circuit=mark
Closed circuit=mark
•
TTL
Plus level=mark
Minus level=mark
•
EIA
received data
Minus level=mark (standard convention)
or
Plus level=mark
The
outEY1 options are:
•
Current driver output
Current=mark
No current=mark
•
Solid state switch/TTL
Closed/minus=mark or
Open/plus=mark
•
EIA
transmitted data
Minus=mark
(standard convention)
Teletypewriter Adapter
4-1
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