接到环中它的下一个模块的接收器上，从而不断形成-一个通信环。下图说明了由4个UR系列保护装置组成的环,这些保护装置的连接是:UR1-Tx至UR2-Rx，UR2-Tx至UR3-Rx，UR3-Tx至UR4-Rx，和UR4-Tx至UR1-Rx。一个单环上最多可连接16个UR系列保护装置。e)测试模块(开关85和S6)
HONEYWELL W7750A-2005 NSPP W7750A2005
HONEYWELL HFM5100-EAM NSFP HFM5100EAM
Honeywell RM7895-A-1014 Burner Control
HONEYWELL 30756396-002 NSPP 30756396002
HONEYWELL DC200H-0-200-100000-0 USPP DC200H0200100000
HONEYWELL M934A-1243-5 NSFP M934A12435
Honeywell HC900 Controller DCS 900G02-0102 Digital In
HONEYWELL DC500-E0-0L00-200-10000-E0-0
HONEYWELL 51304161-200 REV C BOARD
HONEYWELL 30751856-001 MEMORY BD 30751856001
HONEYWELL 30732438-001 DISPLAY GENERATOR BD 30732438001
HONEYWELL 14501810-002 USPP 14501810002
HONEYWELL DC3002-0-20A-2-00-0111 USPP DC3002020A200011
HONEYWELL DC300E-E-100-22-0000-0 USPP DC300EE100220000