RS is really Rockwell Software
All the programming software for Allen-Bradley these days is produced or marketed by Rockwell Software. RSLinx is the communications packet that you get with the RSLogix package you buy. I personally have not seen a manual just about RSLinx, but there may be one available somewhere. This address will let you pick any manual you like for the RSlogix products.
Allen-Bradley/Rockwell Software
And this list of downloadable PDF files is on the page at the address above. I hope this helps, along with the suggestions of Ron Doran
RSLogix Automation Interface LOGIX-RM001B-EN-P 9324 Series Oct 2002
RSLogix Technical Data 9398-LOGIXTD 9324 Series Jan 1998
RSLogix 500 Getting Results Guide LG500-GR001A-EN-P 9324-RL0 Series Jul 2002
RSLogix 5 Getting Results Guide LG5-GR001A-EN-P 9324-RL5 Series Jul 2002
RSLogix 5000 Tech Data 9398-LOGIX5000TD 9324-RLD Series Sep 2000
RSLogix 5000 Getting Results 9399-RLD300GR 9324-RLD Series Aug 2000
RSLogix 5000 PIDE Autotuner Getting Results PIDE-GR001B-EN-E 9324-RLD Series Mar 2003
RSLogix Emulate Tech Data EMULAT-TD001B-EN-P 9310-WE0200E, 9310-WE5200E May 2001
RSLogix Emulate Guide 9399-WEGR 9310-WE0200E, 9310-WE5200E Aug 2000
RSLogix Frameworks Tech Data 9398-FRAMEWORKSTD 9324-FW Series May 1999
RSLogix Frameworks Diagram Dev. Guide 9399-FW5DDGR 9324-FW Series Jul 1999
RSLogix Frameworks Function Builder Guide 9399-FW5FBGR 9324-FW Series Jul 1999