Passing collection parameter to JasperServer report via query string

Question

I'm trying to pass a collection parameter to a report. This report is shown inside an IFRAME and I'm passing the parameter this way:

I want to insert a report in an iframe in my web application.

The report has a "collection" parameter IdTurno. In the query-string I'm passing values this way:

http:jasper_server_url?ids=1,2,3

but this doesn't work. What's the correct way to pass collection parameters via query string? Can't find documentation about this.

Note I'm using JasperServer community edition v.5.1