---
lang: "en"
title: "ATC-277MM: ST Type Serial-Fiber Converter"
sku: "ATC-277MM-ST"
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brand: "MARCOM S.r.l."
end_of_life: "false"
---

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ATC-277MM: RS232/422/485 Serial-Multimode Fiber Converter, ST Fiber Connector

ATC-277MM is a fiber optic modem that allows the connection of RS232/422/485 devices via a multimode fiber cable.
The device allows connection up to 2 kilometers of fiber optic cables and supports point-to-point or Ring (point-to-multipoint) modes.

It supports data transfer rates up to 250kbps and allows coupling devices with different interfaces. This means that ATC-277MM can replace interface converters and isolators when connecting remote devices, preserving the EMI/RFI characteristics and transient immunity of optical fiber.

ATC-277MM supports both transmission and reception lines, and offers full hardware control of the RS-422/485 driver with automatic circuit for transmitted data control.
All serial connections are available on the female DB-9 connector or on a removable 6-pin terminal block, while the fiber optic is connected via ST connectors.

## Features

- Power supply: 9-24Vdc 250mA max
- Data interface: RS232, RS422/485 auto switching - Auto direction flow control (RS485)
- Fiber Port Connector: ST multimode
- Fiber cable: 62.5/125um
- Wavelength: 850nm
- Max fiber length 2km
- Operating temperature: From -40 to +70°C

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Source: https://shop.marcomweb.it/en/fiber-media-converter/atc-277mm-st-type-serial-fiber-converter

MARCOM S.r.l. — a trusted supplier for industrial automation and building automation.