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First of all give you many thanks for this excellent plugin. It is valid for many items of our printers.

I have a little problem. My commands.cfg I add:
#'check_printer' command definition
define command{
command_name check_printer
command_line $USER1$/check_printer -H $HOSTADDRESS$ -p $ARG1$ $ARG2$ $ARG3$
}
After this I add this to my printers.cfg:
define service{
use generic-service
host_name ljpm1217nfwmfp
service_description PS
check_command check_printer!-H 192.168.220.11 -C public -x "STATUS" -w WARNING -x CRITICAL -S / |-V|-h
normal_check_interval 1
retry_check_interval 1
}

But the Nagios webpage return me a "null". Can you help me please?

Thanks a lot,
Alex.