Hello all!
I try to get working mikrotik with apc upses, one is APC Smart ups 1250 other Black Ups Pro 280,but have some strange problems.When i build cable found in mikrotik ups manual and conect it to routerboard,board not boot,when ups is conected,but if set serial port baud rate to 2400;8 data bit;1 stop, xon-xoff flow control and add ups in ups menu Black ups is showing,and monitoring in mt,but when i conect same cable to Smart ups 1250,with same parametrs,just reboot board and remove serial console,ups menu shows i 
I conect both upses to pc via same cable and with terminal programm check that both are smart upses and working with same comands,i can get model,test leds and get other values from upses. When i build APC 940-0024C cable found in acpd homesite routerboard boots and black ups monitoring fine,i not checked all features.Same problem with APC Smart ups 1250 is on Pc based router with mt software,i using 2.9.22 on routerboard and pc..Is APC Smart ups 1250 supported by mt 
Sory for my english.