PDP11 PeripheralsHbk 1972 - Trailing-Edge

Receiver Buffer Register (RBUF)
Transmitter Buffer Register (TBUF)
8.2.4 Specifications
Operating mode:
Data Rates:
Data Format:
Order of Bit:
Transmission:
Parity:
Distortion Input:
Output:
Data Signals:
Control Signals:
Program Interrupts:
Bus Load:
Physical Connection:
Space Required:
Power Required:
Temperature/Humidity:
8-BIT DATA
8-£;3IT DATA
! I
Full- or half-duplex selected under software control.
50, 75, 110, 134.5, 150, 300, 600, 1200, 1800
Baud or one user specified Baud rate between 600
and 10,000. Four speeds are available to the user
under program control. Transmitting and receiving
rates are independent. See DCll models for specific
combinations available.
One start bit. Character size is variable uhder program
control to 5, 6, 7, or 8 data bits. Stop code is
programmable to one or two bits.
Low order bit first.
Computed on incoming data.
Can tolerate up to 40% per character.
Less than 3% per character.
Conforms to EIA RS-232-C and CCITT specifications.
All control leads from the Bell 103, 202 or equivalent
modems are brought into the unit with the exception
of data set ready. All leads are EIA RS-232-
C and CCITT compatible.
Receive done, transmit done, receive overrun, ring,
and carrier transition. (If appropriate enable bits
are set)
One line unit represents a one unit load to the
PDP-l1 UNIBUS. The UNIBUS can handle 18 unit
loads. For more than 18 unit loads a bus extender,
DBll-A, must be used.
25-foot cable with EIA RS-232-C-Compatible 25-Pin
male connector.
1 systems unit for either one or two line interfaces.
2.2 amps of + 5 Volts for the first interface in a
systems unit.
2.0 amps of + 5 Volts for the second interface in a
systems unit.
10° _50 0
C with 20 to 90% noncondensing humidity.
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