Serial (DB-9) ↔ Parallel Port (DB-25)
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Compatibility check and signal path analysis
Adapter Required
These connectors are not directly compatible. An adapter or converter cable is needed.
Signal Path
Serial (DB-9)
Family
Legacy Data
Form Factor
D-sub 9-pin
Pin Count
9
Reversible
No
Parallel Port (DB-25)
Family
Legacy Data
Form Factor
D-sub 25-pin
Pin Count
25
Reversible
No
Notes
Serial (DB-9) to Parallel Port (DB-25): Different legacy data connectors (serial, parallel, PS/2) use different protocols and are not directly interchangeable. The Serial (DB-9) (Legacy Data) and Parallel Port (DB-25) (Legacy Data) share the same connector family.