Difference between revisions of "DF11 Communications Line Adapter"
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* DF11-K (M598, M973) - 4-wire opto-isolated 20mA adapter; '[[passive]]' mode (up to 2400 baud) | * DF11-K (M598, M973) - 4-wire opto-isolated 20mA adapter; '[[passive]]' mode (up to 2400 baud) | ||
| − | The DF11-K has [[jumper]]s to allow each channel to be changed to 'active' mode. | + | The DF11-K has [[jumper]]s to allow each channel to be changed to [[20mA current loop serial line interface|'active']] mode. |
{{semi-stub}} | {{semi-stub}} | ||
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| + | ==External links== | ||
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| + | * [http://www.bitsavers.org/pdf/dec/pdp10/periph/MP00068_DN87_Universal_Comm_System_Front_End_Jan76.pdf DN87 Field Maintenance Print Set] - contains complete engineering drawings for the DF11 boards on pp. 73-99 | ||
[[Category: UNIBUS Serial Interfaces]] | [[Category: UNIBUS Serial Interfaces]] | ||
Revision as of 20:16, 15 October 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
