I need an owners manual

You can download a manual (06656 User's Guide/Programming Guide) at the DataLogic site. They bought PSC in 2005.
http://www.scanning.datalogic.com/sitefiles/result.aspx?m=Product%20Manual&p=53XX&l=english&d=1&t=search&s=NonCurrent

If your cables are connected between your keyboard and PC, be sure to set up the correct Keyboard Wedge Parameters, beginning on Page 34, to allow connectivity.
I'd start by scannig barcodes "CE" and "ZA" to reset to default wedge values. If that doesn't work, I'd procede to sc an "CF" for PC=AT,PS/2.
Pages 36 & 37 address the Caps Lock issue, where the scanned value is in the wrong upper or lower case.

Have a nice day,
Label_Guy