[–] h2odragon 3y ago ↗ see also: https://allpinouts.org/pinouts/connectors/serial/rs232-eia-2...There were once devices that demanded all the nasty "secondary" lines be implemented.
[–] jaclaz 3y ago ↗ Truism of the week:>An RS232 pinout 9 pin cable features nine pins [–] h2odragon 3y ago ↗ But often not 9 actual cables; it was very common to find 8 wire cables that left RI floating. [–] jaclaz 3y ago ↗ Sure, just like the 25 pin connector in PC's was used with less than 25 wires cables, leaving most of the pins unconnected:https://allpinouts.org/pinouts/connectors/serial/pc-serial-2...still a 25 pin connector has twentyfive pins and a 9 pin one has nine pins.The same (DB25 or DB9) connector has been in use in countless devices with even less wires, null-modem cables had only 7:https://www.firewall.cx/networking-topics/cabling-utp-fibre/...And if the cable/connection was monodirectional, even less, I seem to remember repairing a connector of a cable going to a serial printer having only 4 wires (or were they 5?) on a DB25 connector.
[–] h2odragon 3y ago ↗ But often not 9 actual cables; it was very common to find 8 wire cables that left RI floating. [–] jaclaz 3y ago ↗ Sure, just like the 25 pin connector in PC's was used with less than 25 wires cables, leaving most of the pins unconnected:https://allpinouts.org/pinouts/connectors/serial/pc-serial-2...still a 25 pin connector has twentyfive pins and a 9 pin one has nine pins.The same (DB25 or DB9) connector has been in use in countless devices with even less wires, null-modem cables had only 7:https://www.firewall.cx/networking-topics/cabling-utp-fibre/...And if the cable/connection was monodirectional, even less, I seem to remember repairing a connector of a cable going to a serial printer having only 4 wires (or were they 5?) on a DB25 connector.
[–] jaclaz 3y ago ↗ Sure, just like the 25 pin connector in PC's was used with less than 25 wires cables, leaving most of the pins unconnected:https://allpinouts.org/pinouts/connectors/serial/pc-serial-2...still a 25 pin connector has twentyfive pins and a 9 pin one has nine pins.The same (DB25 or DB9) connector has been in use in countless devices with even less wires, null-modem cables had only 7:https://www.firewall.cx/networking-topics/cabling-utp-fibre/...And if the cable/connection was monodirectional, even less, I seem to remember repairing a connector of a cable going to a serial printer having only 4 wires (or were they 5?) on a DB25 connector.
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[ 3.1 ms ] story [ 25.1 ms ] threadThere were once devices that demanded all the nasty "secondary" lines be implemented.
>An RS232 pinout 9 pin cable features nine pins
https://allpinouts.org/pinouts/connectors/serial/pc-serial-2...
still a 25 pin connector has twentyfive pins and a 9 pin one has nine pins.
The same (DB25 or DB9) connector has been in use in countless devices with even less wires, null-modem cables had only 7:
https://www.firewall.cx/networking-topics/cabling-utp-fibre/...
And if the cable/connection was monodirectional, even less, I seem to remember repairing a connector of a cable going to a serial printer having only 4 wires (or were they 5?) on a DB25 connector.