| General information |
| Product type designation | CB 1241 RS 485 |
| Input current |
| from backplane bus 5 V DC, typ. | 75 mA |
| Power loss |
| Power loss, typ. | 0.4 W |
| Interfaces |
| Interfaces/bus type | RS 485 |
| Number of interfaces | 1 |
| Point-to-point connection |
| ● Cable length, max. | 1 000 m |
| Integrated protocol driver |
| — Freeport | Yes |
| — ASCII | Yes; Available as library function |
| — Modbus RTU master | Yes |
| — Modbus RTU device | Yes |
| — USS | Yes; Available as library function |
| Interface types |
| RS 485 |
| ● Transmission rate, max. | 250 kbit/s |
| Protocols |
| Integrated protocols |
| Freeport |
| — Telegram length, max. | 4 kbyte |
| — Bits per character | 7 or 8 |
| — Number of stop bits | 1 (Standard), 2 |
| — Parity | no parity (standard); even, odd, mark (parity bit always 1); space (parity bit always 0) |
| Modbus RTU master |
| — Address area | 1 through 65535 (Standard Modbus addressing) |
| — max. number of devices | 247; slave numbers 1 through 247, per MODBUS network segment maximum 32 devices, additional repeaters needed to expand the network to maximum configuration |
| protocols / Modbus RTU device / header |
| — Address area | 1 through 65535 (Standard Modbus addressing) |
| Interrupts/diagnostics/status information |
| Diagnostics function | Yes |
| Diagnostics indication LED |
| ● DIAG LED | Yes |
| ● for status of the outputs | Yes |
| Degree and class of protection |
| IP degree of protection | IP20 |
| Standards, approvals, certificates |
| CE mark | Yes |
| CSA approval | No |
| UL approval | Yes |
| cULus | Yes |
| FM approval | No |
| RCM (formerly C-TICK) | Yes |
| KC approval | Yes |
| Marine approval | No |
| Ambient conditions |
| Free fall |
| ● Fall height, max. | 0.3 m; five times, in product package |
| Ambient temperature during operation |
| ● horizontal installation, min. | -20 °C |
| ● horizontal installation, max. | 60 °C; at max. voltages and max. specification |
| ● vertical installation, min. | -20 °C |
| ● vertical installation, max. | 50 °C; at max. voltages and max. specification |
| Ambient temperature during storage/transportation |
| ● min. | -40 °C |
| ● max. | 70 °C |
| Air pressure acc. to IEC 60068-2-13 |
| ● Operation, min. | 540 hPa |
| ● Operation, max. | 1 140 hPa |
| ● Storage/transport, min. | 540 hPa |
| ● Storage/transport, max. | 1 140 hPa |
| Altitude during operation relating to sea level |
| ● Installation altitude, min. | -1 000 m |
| ● Installation altitude, max. | 5 000 m; Restrictions for installation altitudes > 2 000 m, see manual |
| Relative humidity |
| ● Operation, max. | 95 %; no condensation |
| Vibrations |
| ● Vibration resistance during operation acc. to IEC 60068-2-6 | 3.5 mm from 5 - 8.4 Hz, 1g from 8.4 - 150 Hz |
| ● Operation, tested according to IEC 60068-2-6 | Yes |
| Shock testing |
| ● tested according to IEC 60068-2-27 | Yes; IEC 68, Part 2-27 half-sine: strength of the shock 15 g (peak value), duration 11 ms |
| Pollutant concentrations |
| ● SO2 at RH < 60% without condensation | S02: < 0.5 ppm; H2S: < 0.1 ppm; RH < 60 % condensation-free |
| Mechanics/material |
| Enclosure material (front) | |
| ● Plastic | Yes |
| Dimensions |
| Width | 15 mm |
| Height | 62 mm |
| Depth | 63 mm |
| Weights |
| Weight, approx. | 29 g |