---
lang: "en"
title: "ATC-277SM-SC Single-mode Serial-fiber SC Type Converter"
sku: "ATC-277SM-SC"
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brand: "MARCOM S.r.l."
end_of_life: "false"
---

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ATC-277SM-SC: Single-mode RS232/422/485 serial-fiber converter, SC connector

The 277SM modem has been designed to provide the most versatile connection possible between any asynchronous serial equipment using fiber optic cable. It allows any two asynchronous serial equipment components to communicate in full or half-duplex mode over two fibers at typical distances up to 20 KM. RS-232 data signals up to 115.2Kbps and RS-422 or RS-485 data signals up to 250Kbps are supported. Different standards can be combined and matched to allow RS-232 devices to connect to an RS-422 or RS-485 system. This means that the MODEL 277SM can replace converters and isolators when connecting remote devices, while providing the EMI/RFI and transient immunity of fiber optics.

The 277SM modem supports both transmit and receive data lines and provides full hardware control of the RS-422/485 driver with an automatic Send Data Control circuit. Timeouts are automatically detected between 0.10 and 2.2 ms. All serial connections are provided on the DB-9 male connector or the 6-bit terminal block, while the single-mode fiber is connected via two SC/ST/FC connectors. The unit is powered by 9-24 VDC at 250 mA max.

## Technical Features

- Transmission Line: Dual single-mode optical cable
- Point to Point Transmission: Asynchronous, half or full-duplex
- Interfaces: RS-232, RS-422 or RS-485
- Data Rate 

- RS-232: 0 to 115.2 KBPS
- RS-422/485: 0 to 250 KBPS
- Distance: RS-485/RS-422 0-1.2 Km
- Typical Fiber Range: Up to 20 Km on single-mode glass fiber
- Coupled Power Budget: 15.0 dB
- Optical Wavelength: 1310 nm
- Fiber Connector: 

- SC (ATC-277SM-SC)
- ST (ATC-277SM-ST)
- FC (ATC-277SM-FC)
- Connectors: DB-9 male for RS-232, 6-bit terminal block for RS-422/485 connection
- Power Supply: Requires 9 – 24V VDC @ 250 mA max.
- Operating Temperature: -40°C to 70°C
- EMI and Safety: CE, FCC Class A
- Dimensions: 96 L x 66 W x 26 H (mm)
- Weight: 0.40 Kg 

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Source: https://shop.marcomweb.it/en/fiber-media-converter/atc-277sm-sc-single-mode-serial-fiber-sc-type-converter

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