Difference between revisions of "DF11 Communications Line Adapter"
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The '''DF11 Communications Line Adapter''' performs two functions for [[serial line]] communication [[interface]]s 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. | The '''DF11 Communications Line Adapter''' performs two functions for [[serial line]] communication [[interface]]s 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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| + | [[Image:M970.jpg|250px|thumb|right|M970 EIA Berg header card]] | ||
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. | 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. | ||
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| + | [[Image:M5960.jpg|250px|thumb|right|M5960 TTL to 20mA Level Converter]] | ||
The DF11 plugs into a common [[backplane]] with the serial interface. DF11's are used with [[DP11-A synchronous serial line interface|DP11]], [[DM11 asynchronous serial line interface|DM11]], [[DH11 asynchronous serial line interface|DH11]], [[DC11 asynchronous serial line interface|DC11]]; and [[DL11 asynchronous serial line interface|DL11]] and [[DU11 synchronous serial line interface|DU11]] [[UNIBUS]] serial interfaces (the latter two only in [[DD11-B backplane]]s, where the DF11 plugs into the A-B [[DEC edge connector contact identification|connectors]]). They may also be used in some versions of the [[PDP-11/05]] or [[PDP-11/10]]. | The DF11 plugs into a common [[backplane]] with the serial interface. DF11's are used with [[DP11-A synchronous serial line interface|DP11]], [[DM11 asynchronous serial line interface|DM11]], [[DH11 asynchronous serial line interface|DH11]], [[DC11 asynchronous serial line interface|DC11]]; and [[DL11 asynchronous serial line interface|DL11]] and [[DU11 synchronous serial line interface|DU11]] [[UNIBUS]] serial interfaces (the latter two only in [[DD11-B backplane]]s, where the DF11 plugs into the A-B [[DEC edge connector contact identification|connectors]]). They may also be used in some versions of the [[PDP-11/05]] or [[PDP-11/10]]. | ||
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| + | [[Image:M973.jpg|250px|thumb|right|M973 20mA Mate-N-Lok header card]] | ||
DF11 models include: | DF11 models include: | ||
Revision as of 03:48, 6 December 2021
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 DP11, DM11, DH11, DC11; and DL11 and DU11 UNIBUS serial interfaces (the latter two only in DD11-B backplanes, where the DF11 plugs into the A-B connectors). They may also be used in some versions of the PDP-11/05 or PDP-11/10.
DF11 models include:
- DF11-A (M594, M957-BC01R, M970-BC01R for modem cable) - EIA RS-232 adapter
- DF11-BA (M586) - integral modem for connection to a telephone line
- DF11-BB (M587) - integral answer-only modem
- DF11-F (M596, M973) - 20m current loop adapter; 'active' mode (up to 300 baud)
- DF11-G (M595, BC01T-BC01Y) - custom 20mA interface to a Bell 301/303 modem
- DF11-K (M598, M973) - 4-wire opto-isolated 20mA adapter; 'passive' mode (up to 2400 baud)
The DF11-K has jumpers to allow each channel to be changed to 'active' mode.
External links
- DN87 Field Maintenance Print Set - contains complete engineering drawings for the DF11 boards on pp. 73-99
