I have used a 9 pin output to the chassis and extended 12V+, GND, out1-, out2-, out3-, input1, ZD1 and R9. Made a small box, and put some parts in it. A 9 pin connector, a push button (for Input1), a swich (for reset), 3 LEDs for indication, a power connector (for a 12 V adaptor) and female RCA connectors for relays. So I can control 3 12 V relays, and see which is on, or off. Now I only use one of them to control a 230V lamp. So I need the UIRT2 to work continuosly or the lamp would go off when closing Girder. If UIRT2 freezes, I can reset it by the switch.

"This would only reset the UIRT with a PC running without Girder. If you want a "hard" reset you should connect the button between MCLR and GND."

I missed this sentence last time, so I've put the switch between R9 and ZD1, but seems to work so far. I may change it if necessary.

I burned down an old 12V adaptor (it was a battery charger for an Ericsson phone). I haven't noticed that one wire of the serial cable that I used was connected to the trapezoid shield, and the chassis of the box I made (of metal sheet) is connected to 12V+. So there was a short circuit between 12+ and 12V-
Now everything is OK.
p.s. (sorry for my English)