Hub

I-7513 CR is a three-way isolated RS-485 active star wiring hub for engineers who need to branch a serial bus into several independent segments. Each of its three output channels has its own driver, so a fault or long run on one branch does not have to affect the others.The hub and repeater functions allow each output channel to feed another hub, which makes it practical to extend an RS-485 network and build out a star topology. Isolation is applied at the input and output interface circuits, giving 3000 VDC three-way isolation between the connected segments.Automatic RS-485 direction control and ESD protection on the data line simplify wiring and help protect the bus. This CR ordering code carries the blue cover and is supplied with a plastic housing for DIN-rail installation.ApplicationsRS-485 active star wiring applicationsExtending the reach of RS-485 serial networks

The I-7513-G splits one RS-485 master link into three independently driven RS-485 outputs, so a single bus can be fanned out to several slave branches. Each output channel has its own driver and is rated for up to 4,000 ft (1200 m) of cable.Because the unit provides both hub and repeater functions, any output channel can feed another hub, allowing star-wired RS-485 networks to be built in stages. Isolation is applied in the input and output interface circuits, giving three-way isolation between the connected segments.Ideal for engineers designing RS-485 star topologies who need electrical separation between branches, the -G variant ships with a gray cover and is intended for DIN-rail installation within the -25 ~ +75 °C operating range.ApplicationsRS-485 star wiring networksFanning out a single RS-485 bus to multiple slave branchesExtending RS-485 networks through cascaded hubsElectrically separating RS-485 segments in industrial serial communication systems

The I-7520U4-G CR takes one RS-232 master input and forwards its data simultaneously to four independent RS-485 outputs, allowing a single serial master to reach several RS-485 devices in a star topology. Each output channel has its own driver, and the hub switches direction automatically.Baud rate is set by the rotary switch, with a choice between Self-Tuner mode, which supports multiple baud rates and data formats, and a fixed baud rate mode, which is better suited to long or lossy lines and electrically noisy surroundings. A short-circuit protection feature switches off a faulty RS-485 channel so that the remaining devices keep communicating.Each channel includes a 120Ω termination resistor that is jumper selectable and disabled by default, useful where signal reflections must be controlled. Power and communication LEDs assist with troubleshooting, and the plastic DIN-rail unit runs from +10 VDC to +30 VDC over an operating range of -25 ~ +75 °C.ApplicationsDistributing serial data from one RS-232 master to several RS-485 slave devicesRS-485 networks running over long lines or in electrically noisy environmentsIndustrial serial communication cabinets with DIN-rail installation