— USSYes; Available as library function
— ASCIIYes; Available as library function
— ParityNo parity (standard); even, uneven, mark (parity bit always 1); space (parity bit always 0)
— FreeportYes
— Address area1 through 49 999 (Standard Modbus addressing)
Weight, approx.155 g
Power loss, typ.1.1 W
Rated value (DC)24 V
— Modbus RTU deviceYes
— Modbus RTU masterYes
Interfaces/bus typeRS 422 / 485 (X.27)
— Bits per character7 or 8
— Number of stop bits1 (Standard), 2
— Telegram length, max.1 kbyte
Diagnostics functionYes
Number of interfaces1
— max. number of devices247; slave numbers 1 through 247, per MODBUS network segment maximum 32 devices, additional repeaters needed to expand the network to maximum configuration
Current consumption, max.220 mA; From backplane bus 5 V DC
IP degree of protectionIP20
Product type designationCM 1241 RS 422 / 485
permissible range, lower limit (DC)20.4 V
permissible range, upper limit (DC)28.8 V
— Against chemically active substances acc. to EN 60654-4Yes; Class 3 (excluding trichlorethylene)
— to chemically active substances according to EN 60721-3-3Yes; Class 3C4 (RH < 75 %) incl. salt spray acc. to EN 60068-2-52 (severity degree 3); *
— to chemically active substances according to EN 60721-3-6Yes; Class 6C3 (RH < 75 %) incl. salt spray acc. to EN 60068-2-52 (severity degree 3); *
— to biologically active substances according to EN 60721-3-3Yes; Class 3B2 mold, fungus and dry rot spores (with the exception of fauna); Class 3B3 on request
— to biologically active substances according to EN 60721-3-6Yes; Class 6B2 mold and fungal spores (excluding fauna); Class 6B3 on request
— to mechanically active substances according to EN 60721-3-3Yes; Class 3S4 incl. sand, dust, *
— to mechanically active substances according to EN 60721-3-6Yes; Class 6S3 incl. sand, dust; *
— Resistant to commercially available coolants and lubricantsYes; Incl. diesel and oil droplets in the air
— Environmental conditions for process, measuring and control systems acc. to ANSI/ISA-71.04Yes; Level GX group A/B (excluding trichlorethylene; harmful gas concentrations up to the limits of EN 60721-3-3 class 3C4 permissible); level LC3 (salt spray) and level LB3 (oil)
— Note regarding classification of environmental conditions acc. to EN 60721, EN 60654-4 and ANSI/ISA-71.04* The supplied plug covers must remain in place over the unused interfaces during operation!
