RS-232 Circuit Card


The model F280xD products are fiber optic modems designed to extend an RS-232 signal over fiber. These modems can also be used as a four channel synchronous/asynchronous data multiplexer, are DTE/DCE switch selectable, and can interface with the VERSITRON M62xxD/M82xxD Fiber Optic Micromodems.

A Model F280xD link uses fiber optic cable of up to 2Km for 1310nm multimode optics and 20Km for 1310nm singlemode optics. The link has a maximum data rate of 128Kbps, providing synchronous, asynchronous or isochronous full-duplex or simplex data transmission with fully transparent operation. The Model F280xD FOM II modems support the interface control signals associated with the EIA/TIA RS-232 or CCITT V.24/V.28, RS-423, and MIL-STD-188-114A standards. This is accomplished by multiplexing the control signals along with clock and data signals and transmitting this serialized signal to the remote unit. At the remote unit the signal is de-multiplexed and applied to the interface.

Product Models

Model Function Data Rate Connector Fiber Cable Wavelength Max Distance
F2802D RS-232, RS-423, MIL-STD-188-114A Fiber Optic Modem Up to 128Kbps LC MM 1310nm 2Km
F2805D RS-232, RS-423, MIL-STD-188-114A Fiber Optic Modem Up to 128Kbps LC SM 1310nm 20Km

General Specifications

Dimensions 11.75 x 7 x .845in / 29.8 x 17.8 x 2.1cm (L x W x H)
Weight 0.455kg (16oz)
Operating Temperature 0° to 50°C (32° to 122°)
Storage Temperature -40° to 70°C (-40° to 158°F)
Humidity Up to 95% relative humidity (non-condensing)
Altitude Up to 10,000 ft

Electrical Interface

Power Requirements 12VDC, 1.2Amp
Copper Interface Connector DB25
Format RS-232 / RS-423 / MIL-STD-188-114A
Protocol Asynchronous / Synchronous / Isochronous
Terminal Timing Data Rate 20 -128 Kbps
Source Timing Data Rate 20 – 100 Kbps
SDCE/DTE Options DCE or DTE (Switch Selectable)

Fiber Interface

Fiber Interface Connector LC
Fiber Cable Multimode: 50/125, 62.5/125
Singlemode: 8/125, 9/125
Link Margin 11dB into 62.5/125 Multimode Fiber
8dB into 50/125 Multimode Fiber
19dB into 9/125 Singlemode Fiber

Chasiss and Accessories

HF-1 Single Card Enclosure
HF-2SS 2-Slot 19” Rack-Mount Chassis
HF-20A 20-Slot 19” Rack-Mount Chassis
AC300WR Redundant Power Supply / System Monitor
PSAC08 110VAC to 12VDC Power Adapter
PSAC09 220VAC to 12VDC Power Adapter
ADPHF01 Single-Slot Blank Panel for HF-2SS or HF-1
ADPHF02 Double-Slot Blank Panel for HF-20A Chassis