IBM Series 1 User Manual page 128

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This interface offers signal and bit rate selectability to
accommodate a wide range of devices. The full range of
input options is as follows:
Non-isolated contact sense
Non-isolated contact sense
Isolated contact sense
Isolated contact sense
TTL
TTL
ElA received data
EIA received data
Data mark convention
Closed circuit=mark
Open circuit=mark
Closed circuit=mark
Open circuit=mark
Minus=mark
Plus=mark
Minus (standard convention)=mark
Plus=mark
These input options are selected by utilizing afpropriate
top-card connector pins and by jumper pins on the card. The
output signals to the device are non-isolated solid state
switches, current drivers, and EIA drivers. The range of
output options is as follows:
Curren t dri ver
Current driver
Solid state switch/TTL
Solid state switch/TTL
EIA transmitted data
EIA data terminal ready
Solid state switch/TTL
Solid state switch/TTL
Data mark convention
Current out=mark
No current out=mark
Closed/minus=mark
Open/plus=mark
Minus (standard convention)=mark
None (on=±12V installed)
with write command
With read command
The write and read control outputs are available for device
control of the user's hardware and are switched
by
modifier
bit 1 of the write and Read commands, respectively. These
outputs are not used for any standard attachment of a
teletypewriter I/O device.
Output options are selected
by
utilizing the
appropriate top-card connector pins.
The teletypewriter adapter operates full duplex. Data
may be concurrently transmitted and received between the
adapter and the device.
Teletypewriter Adapter 4-5