9-Pin Protocol
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The Sony 9-Pin Protocol or P1 protocol is a two-way communications protocol to control advanced video recorders. Sony introduced this protocol to control reel-to-reel type C video tape recorders (VTR) as well as videocassette recorders (VCR). It uses an RS-422 D-sub 9-pin connector (hence the name), where bi-directional communication takes place over a four wire cable.
While nowadays all post-production editing is done with a non-linear editing system, in those days editing was done linearly, using online editing. Editing machines relied heavily on the 9-Pin Protocol to remotely control automatic players and recorders.
Many modern hard disk recorders can still emulate a 1982 Sony BVW-75 Betacam tape recorder.
Sony's standard also specifies a pinout:
| Pin | on master | on slave |
|---|---|---|
| 1 | Frame ground | Frame ground |
| 2 | Receive A | Transmit A |
| 3 | Transmit B | Receive B |
| 4 | Transmit common | Receive common |
| 5 | Spare or ground | Spare or ground |
| 6 | Receive common | Transmit common |
| 7 | Receive B | Transmit B |
| 8 | Transmit A | Receive A |
| 9 | Frame ground | Frame ground |
The 9-pin RS-422 pinout has become a de facto standard, used by most brands in the broadcast industry. In the new millennium, RS-422 is slowly phased out in favor of Ethernet for control functions. However its simple way to perform troubleshooting means it will stay around for a long time.
In broadcast automation the Video Disk Control Protocol (VDCP) use the 9-Pin Protocol to playout broadcast programming schedules.
External links
References
- Protocol of Remote-1 (9-pin) Connector, 2nd Edition, Sony, document number 9-977-544-13