So - currently configuring a workstation that needs to capture from up to eight VTRs simultaneously. The recommendation from the software vendor (METUS Ingest) is the MOXA CP-118EL-A which is eight serial ports on a 4-lane PCI-e card. I've used other MOXA products in the Electric Friends camera robots we installed in Studio B at BBC New Broadcasting House and they are proper industrial parts that look like they'll last for decades!
So, there are two things to bear in mind when using one of these cards with video apps (and hence old-school VTRs); even in RS422 mode they do use the Sony 9-pin D(m) pins for the Tx and Rx pairs (and the signal ground).
So, wire your cables thus;
Although you'll find the ports in Windows device manager, you will need to go into the settings for the multi-port serial adaptor to make sure they are set for RS422 rather than RS232.
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