[How to set a fixed Gateway IP address on a WATCHPAX?]

I used Watchpax4. I must set a fixed Ip ,subnet mask and Gateway ip address on a Watchpax.

I edit the Startup Script in WATCHOUT to define initial WATCHPAX settings.

setIP 172.16.3.114 255.255.255.128 172.16.3.126

Then I restarted the watchpax, and checked the watchpax' Ip address. It only saved the Ip address and Subnet mask,

But the Gateway ip address could no save. I  tried many times, but the problem is still not solved. Is there any other way to solve it?

Thanks very much.