Difference between revisions of "DF11 Communications Line Adapter"

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(The basics)
 
(physical installation)
 
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The '''DF11 Communications Line Adapter''' performs two functions for [[serial line]] communication links on [[PDP-11]] computers: i) converts from [[transistor-transistor logic|TTL]] signal levels to the [[voltage]]s, etc needed by a given serial line standard, and ii) produces the physical connector needed for that standard.
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The '''DF11 Communications Line Adapter''' performs two functions for [[serial line]] communication interfaces on [[PDP-11]] computers: i) converts from [[transistor-transistor logic|TTL]] signal levels to the [[voltage]]s, etc needed by a given serial line standard, and ii) produces the physical connector needed for that standard.
  
A DF11 usually involves two [[DEC card form factor|single-width]] cards, one holding the circuitry needed, and the other providing, sometimes with a cable plugged into a [[Berg connector]], the interface connector. At least one dual-width adapter existed, though.
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A DF11 usually involves two [[DEC card form factor|single-width]] cards, one holding the circuitry needed, and the other providing, sometimes with a cable plugged into a [[Berg connector]], the interface connector. At least one dual-width adapter (the DF11-B) existed, though.
  
DF11's are used with [[DC11]], [[DP11]], [[DL11 asynchronous serial line interface|DL11]], and [[DH11 asynchronous serial line interface|DH11]] [[UNIBUS]] serial interfaces.
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The DF11 plugs into a common [[backplane]] with the serial interface. DF11's are used with [[DC11]], [[DP11]], [[DH11 asynchronous serial line interface|DH11]], and [[DL11 asynchronous serial line interface|DL11]] [[UNIBUS]] serial interfaces (the latter only in [[DD11-B backplane]]s). They may also be used in some versions of the [[PDP-11/05]] or [[PDP-11/10]].
  
 
DF11 models include:
 
DF11 models include:
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* DF11-A - [[EIA RS-232 serial line interface|EIA RS-232]] adapter
 
* DF11-A - [[EIA RS-232 serial line interface|EIA RS-232]] adapter
 
* DF11-B - integral [[modem]] for connection to a telephone line
 
* DF11-B - integral [[modem]] for connection to a telephone line
* DF11-F - [[20mA current loop serial line interface|20mA]] adapter
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* DF11-F - [[20mA current loop serial line interface|20m current loop]] adapter (up to 300 [[baud rate|baud]])
 
* DF11-G - custom interface to a Bell 301/303 modem
 
* DF11-G - custom interface to a Bell 301/303 modem
* DF11-K - 4-wire 20mA adapter
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* DF11-K - 4-wire opto-isolated 20mA adapter (up to 2400 baud)
  
 
{{semi-stub}}
 
{{semi-stub}}
  
 
[[Category: UNIBUS Serial Interfaces]]
 
[[Category: UNIBUS Serial Interfaces]]

Latest revision as of 15:18, 18 July 2019

The DF11 Communications Line Adapter performs two functions for serial line communication interfaces on PDP-11 computers: i) converts from TTL signal levels to the voltages, etc needed by a given serial line standard, and ii) produces the physical connector needed for that standard.

A DF11 usually involves two single-width cards, one holding the circuitry needed, and the other providing, sometimes with a cable plugged into a Berg connector, the interface connector. At least one dual-width adapter (the DF11-B) existed, though.

The DF11 plugs into a common backplane with the serial interface. DF11's are used with DC11, DP11, DH11, and DL11 UNIBUS serial interfaces (the latter only in DD11-B backplanes). They may also be used in some versions of the PDP-11/05 or PDP-11/10.

DF11 models include:

  • DF11-A - EIA RS-232 adapter
  • DF11-B - integral modem for connection to a telephone line
  • DF11-F - 20m current loop adapter (up to 300 baud)
  • DF11-G - custom interface to a Bell 301/303 modem
  • DF11-K - 4-wire opto-isolated 20mA adapter (up to 2400 baud)