IMC/9R is a RS232-RS485 isolated DB9 converter that converts from RS232 serial standard (with a DB9 connector) to RS485 (with a 3-pin Mini XLR connector).
This industrial adapter is isolated up to 50 V and is powered by 5 V-12 V DC. It can be used to enable communication between a PC or industrial equipment and an RS485 serial bus, connecting from a DB9 connector with fastening screws to a 3-pin Mini XLR connector.
It is completely protocol-transparent, so it can be used with any proprietary protocol that operates over RS232.
The device is fully Plug & Play and requires no drivers or DIP switches. The RS232-RS485 isolated DB9 converter operates in half-duplex mode and automatically detects data direction and baud rates up to 250 kbps, making it easy to install in any new or existing system.
Technical specifications
| Power supply | 5 - 12 V DC |
|---|---|
| Power consumption | 1 W |
| Serial transmission data rate | 0 - 250 kbps (automatic) |
| Isolation voltage | 50 V (DIN EN 60747) - 2500 V for 1 minute (UL 1577) |
| RS232 connector | D-sub (DB9) |
| Communication type | Full duplex |
|---|---|
| RX input voltage | 1.5 V low input threshold - 1.8 V high input threshold (± 25 V max) |
| TX output voltage | ± 5 V (± 5.4 V max) |
| ESD performance RX / TX | ± 15 kV (Human Body Model) - ± 8 kV IEC61000-4-2 contact discharge |
| Communication type | Half Duplex on balanced line |
|---|---|
| Data direction | Automatic |
| Maximum bus voltage | ± 42 V DC |
| Common mode range | ± 25 V DC |
| ESD protection | ± 15 kV (Human Body Model) - ± 8 kV IEC 61000-4-2 contact |
| Surge protection | Integrated TVS: ± 3 kV IEC 61000-4-5 (surge) - ± 4 kV IEC 61000-4-4 (EFT) |
| Slew rate | Limited, to have an error-free transmission |
| Dimensions | 48 mm x 31 mm x 25 mm |
|---|
| Degree of protection | IP20 |
|---|---|
| Operating temperature | -20 °C to +50 °C |
| Storage temperature | -40 °C to +80 °C |
Full description
IMC/9R is a RS232-RS485 isolated DB9 converter that converts from RS232 serial standard (with a DB9 connector) to RS485 (with a 3-pin Mini XLR connector). This industrial adapter is isolated up to 50 V and is powered by 5 V-12 V DC. It can be used to enable communication between a PC or industrial equipment and an RS485 serial bus, connecting a DB9 connector with fastening screws to a 3-pin Mini XLR connector.
Isolation up to 50 V may be necessary to protect the PC from low- or medium-level overvoltages. The device is fully Plug & Play and requires no drivers or DIP switches. The RS232 serial port operates in full-duplex mode, while the RS485 serial port, isolated up to 50 V, operates in half-duplex mode, with automatic data direction. The RS232-RS485 isolated DB9 converter automatically detects baud rates up to 250 kbps, so it can be easily installed in any new or existing system.
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Use cases
The very compact size of this converter allows it to be installed in tight spaces where there is physically no room for a traditional DIN-rail converter. Another scenario in which this RS232-RS485 isolated DB9 converter may be necessary is when a machine has only a DB9 (or, more precisely, D-sub) port and can communicate only through that port. This converter can be secured to the machine on the D-sub side with screws for maximum communication reliability.
This converter can be powered by 5 V to 12 V DC via a standard jack and can be connected, for example, to a USB port or using a custom power cable. If further isolation of the communication is needed, a DB9 to synthetic optical fiber converter such as DFP/9S is recommended; it draws power directly from the D-sub port, so installation is very simple.
In industrial environments this type of interference is particularly common. The electrical isolation provided by optical fiber is therefore particularly useful, and in some cases even necessary.
Protocol
IMC/9R RS232-RS485 isolated DB9 converter is completely protocol-independent. This means that the converter is transparent to the communication and can be used with any proprietary protocol.
This is possible because the converter operates at the logic level rather than at the protocol level. Therefore, this RS232-RS485 isolated DB9 converter can be used with any computer or machine that communicates via a DB9 port using the RS232 serial standard.
Versatility
The RS232-RS485 isolated DB9 converter is also available with RTS-controlled data direction or with different connectors. ISC/9R converter, for example, is functionally identical to IMC/9R, but data direction is controlled by software (RTS, Request To Send). RMC/9R and RMT/9R feature a non-isolated RS485 interface, should isolation not be required, with a 3-pin Mini XLR or 8-pin RJ45 connector, respectively.
DFP/9S and DFP/9A industrial serial converters have a synthetic optical fiber output with a screw-type connector to electrically isolate the equipment. All combinations of serial standards, optical fiber, and power supply are available in the catalog, while special requests (such as higher baud rates) can be made via the contact form.
