IBM Series 1 User Manual page 240

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TNL: GN34-0368 to GA34-0033-0 (February 4,1977)
~!~~ ~~la!~Q £h~£~i~ist!£§
g~~£ llil.!!~. Any character that is in the process of being
either transmitted or received during a power failure is
either lost or qarbled.
Power-on reset is generated when the system is powered
back up. This siqnal resets all controls and registers in
the teletypewriter adapter except for the receive
serializer-deserializer register. This register is set to
all ones, which is the
ASCII
"rub out" character.
ErrQ£ Recovery. There is no checking of any kind between the
teletypewriter adapter and the user's device.
TEL ETYPEWRITER ADA PTER ELECrRICAL
CHARACTERISTICS
I
CAUTION: Refer to logic page
connector pin designations.
SDlOO
for current cable
The teletypewriter adapter offers tour different interfaces
or "ports" for connecting to user's
devices.
These
interfaces or ports are:
1 )
2)
3)
4)
Isolated current loop
Non-isolated current loop
EIA voltaye level
TTL
voltaqe level
Th~ teletypewriter adapter provides a 16-pin (2x8) top-card
connector for connecting the user's device.
A separdte pin or pair of pins on the top-card
connector provides the inputs and outputs for the four
different interfaces.
Input circuits General Description
Refer to Figure 4-5. There are four basic types of receive
inputs: isolated contact sense, non-isolated contact sense,
TTL, and ETA RS2J2-C level.
Input options are selected:
• By connecting to the appropriate
pins, and
• By a
3-bit,
coded jumper-pin selection on the card.
One bit of this code reverses
the convention of the
input data mark. (See "Jumper Selections" in this
chapter for a detailed explanation of jumpering.)
ISQla!~1 ~0!li~!. Se!!.§~.
Two connector pins are available
for the signal input. The isolated common may be strapped
to signal ground on the user's connector if desired in
certain applications. When the isolated contact sense input
Teletypewriter Adapter 4-17