I-7520U-G Isolated RS-232 to RS-485 Converter

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

The I-7520 CR converts a standard RS-232 serial port into an isolated RS-485 output, so existing PC and industrial controller serial ports can drive RS-485 networks without changes to the hardware or software on the host. RS-485 is better suited to longer cable runs and multi-drop networking than RS-232.Choosing the isolated side: the I-7520 CR isolates the RS-232 side with 3000 VDC, which protects the devices connected there. If the RS-485 side carries the more expensive equipment, the RS-485 isolated variant (I-7520R) is the better fit. The blue cover identifies this RS-232 isolated version; the gray-cover I-7520-G CR has the same specification.The unit has an automatic RS-485 direction control function and ESD protection on the data lines, runs from a +10 VDC to +30 VDC supply and mounts on a DIN rail. It is rated for an operating temperature of -25 ~ +75 °C.ApplicationsExtending RS-232 serial links into long-distance RS-485 communication systemsIndustrial serial networks built around standard PC hardwareProtecting RS-232 side equipment from electrical noise through isolation

I-7520A CR converts an RS-232 serial port, such as one on a standard industrial PC, into an RS-422/485 差分 output for longer-distance serial links. The RS-232 side is galvanically isolated with 3000 VDC, so the devices on that side are protected from noise and faults on the RS-422/485 network.Automatic RS-485 direction control means the module handles transmit and receive switching without extra wiring or software changes. ESD protection on the RS-232/422/485 data line adds robustness in electrically harsh installations, and the unit supports baud rates from 300 to 115200 bps.The blue-cover A variant suits applications where the RS-232 devices are the more expensive or sensitive side, as the isolation sits there. The plastic DIN-rail housing measures 72 x 35 x 118 mm and is rated for operation from -25 to +75 °C.ApplicationsExtending RS-232 serial communication from PC hardware over longer distancesConnecting RS-232 master equipment to RS-422/485 slave devicesIndustrial serial communication networks requiring isolation of the RS-232 side

I-7520AR converts a standard RS-232 serial port into an isolated RS-422/485 output, allowing a PC or other RS-232 host to communicate over longer, more noise-tolerant differential lines without changing the host's hardware or software.The RS-422/485 side is galvanically isolated with 3000 VDC, so the devices connected to that side are protected from noise and faults. Choose this variant when the RS-422/485 side carries the more expensive or more sensitive equipment; the RS-232 side is not isolated.Automatic RS-485 direction control and ESD protection on the data lines help the converter cope with real-world cabling. Supply is +10 VDC to +30 VDC with 1.2 W consumption, and the plastic DIN-rail housing is rated for -25 ~ +75 °C operation. This is the blue-cover version; a grey-cover (-G) variant is listed separately.ApplicationsExtending RS-232 serial links from standard PC hardware into longer RS-422/485 networksConnecting RS-232 host equipment to RS-422/485 devices while isolating the field sideIndustrial serial communication systems requiring noise protection on the RS-422/485 side