... -5Vlinear Current:0-10mA,4-20mAAlarm outputR1A:Relay output(0.8A NO)R1B:Relay output(0.8A NC)Axuliary output:S1:Optoelectronic isolated RS485 ... supply high performance and quality multi channel indicator, 4 channel indicator, 8 channel indicator, 16 channel indicator, 32 channel indicator, 48 channel indicator, digital indicator, process indicator ...