PDP11 PeripheralsHbk 1972 - Trailing-Edge

8.6 FULL DUPLEX 8·BIT ASYNCHRONOUS LINE INTERFACE UNIT-KLll
The KUl will connect the PDP-ll with full duplex 8-bit asynchronous serial lines
and is used with Teletypes or other terminals. The standard interface provides a
20 milliamp. current loop output and a contact closure input for interfacing to
standard Teletype-circuits. The KL1l can be modified to interface to local EIA terminals
by using the DEllA. The DEllA provides ElA data leads and connects to
the local terminal via a 25-pin female connector. This allows EIA terminals which
have a 25-pin male connector to plug directly into the DEll-A. (Note that the 25pin
female connector of the DEll-A will not plug directly into modems which also
have 25-pin female connectors. To interface to asynchronous modems use the
DCll or OMll.)
8.6.1 Programming
Each KL1l contains four requests and hence, requires four addresses. Address
space has been assigned for 16 KL1ls. In addition to the console Teletype which
is discussed in Chapter 2. The four registers and their addresses are listed below
for KL1l unit XX where XX ranges from 50 to 67.
REGISTER ADDRESS
Receiver Status Register 776XXO
Receiver Buffer Register 776XX2
Transmitter Status Register 776XX4
Transmitter Buffer Register 776XX6
The bit assignments are the same as the console Teletype described in Chapter 2.
Each KLll interface requires one interrupt vector. The vector addresses are assigned
from 300 to 777.
All Kllis are shipped with their bus request line attached to BR4. This is changeable
in the field by using a Priority Jumper Plug.
8.6.2 Specifications
MODELS AVAILABLE
KlllA:
KUlB:
KlllC:
KlllD:
KlllE:
KlllF:
DEllA:
Data Format:
Order Transmission:
Bus Load:
Data Signals:
Control for ASR and KSR Teletypes - Full Duplex
110 Baud.
Full Duplex Asynchronous Line Interface Unit 150
Baud
Full Duplex Asynchronous Line Unit 300 Baud
Full Duplex Asynchronous Line Unit 600 Baud
Full Duplex Asynchronous Line Interface Unit 1200
Baud Send, 100 Baud Receive
Full Duplex Asynchronous Line Interface Unit 2400
Baud .
EIA Level, RS·232-C Line Adapter for VT05,VT06 or
other 8-Bit EIA Level Devices .. (Requires Kll1 Interface).
Mounts on KLll
One Start Bit. 8 Data Bits, 2 Stop Bits on KLlI-A
and 1 Stop Bit on KUlB through KLllF.
Low order bit first
One line unit represents a one unit load to the
PDP-ll UNIBUS. The UNIBUS can handle unit
loads. For more tha n unit loads a Bus Extender,
DBl1·A must be used.
For KLll 20 mao output contact closure input. For
KLll plus DEllA. Conforms to EIA RS·232·C
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