What you need is to use the decoder_control.cgi:
Name: decoder_control.cgi
Permission: operator
Syntax: /decoder_control.cgi?command=[&next_url=]
Parameters value description
0 up
1 Stop up
2 down
3 Stop down
4 left
5 Stop left
6 right
7 Stop right
… Reserved
25 center
26 Vertical patrol
27 Stop vertical patrol
28 Horizon patrol
29 Stop horizon patrol
… Reserved
94 IO output high
95 IO output low