HFM5300 RS232/V24 RS232C SPX5135 HFM5300-XYZ - Datasheet Archive

 

HFM5300 Single Fiber Asynchronous Fiber Optic Modem FEATURES · Full duplex RS232/V24 using a single fiber · DC to

 

28 January 1998 HFM5300 HFM5300 Single Fiber Asynchronous Fiber Optic Modem FEATURES · Full duplex RS232/V24 RS232/V24 using a single fiber · DC to 38.4 kb/s asynchronous · Extends RS232C RS232C link to 2 km · Powered with a power cube or through pin 9 on the 25 pin D connector · Complete electrical isolation over the link · Can solve EMI/RFI, ground loop and lightning problems · Small physical size L = 50 (2.00 in), W = 41 (1.62 in),H = 55 mm (2.10 in), 46 g OPHO_232.TIF DESCRIPTION The HFM5300 HFM5300 modem can be used for asynchronous transmission of data and control lines over single optical fiber. Single fiber communication is achieved by means of a dual state optoelectronic device which is alternately switched between transmitt and receive mode by a single integrated circuit. The modem is designed to operate on a single fiber as either a true modem, where the hand shake and control lines are locally interactive (handshake mode) or as a multiplexer transferring the input states of both the data and control lines to the far end modem (data transmission mode). The HFM5300 HFM5300 modem provides EMI/RFI protection, data security, and eliminates ground loop and lightning problems. APPLICATION The unit can be powered using an SPX5135 SPX5135 power cube, or through pin 9 of the 25 pin D-connector using +10 V at 50 mA referenced to pin 7, signal ground. Any standard size multimode simplex fiber optic cable can be used provided that the optical budget for the cable size chosen is sufficient. This will depend on the link length and the number of splices in the cable run. Using 50 micron core diameter cable, link lengths of 2 km are attainable. The modem is available with either ST¨ or SMA optical connectors. Link status is indicated by a bicolour LED on the end of the modem. This indicator changes from red to green as synchronisation is achieved. An orange, display occurs in the transition state. Pinout 1. Protective ground 6. DSR 2. Transmit data 7. Signal ground 3. Receive data 8. DCD 4. RTS 9. Power supply pin 5. CTS ST is a registered trademark of AT & T. © Honeywell Inc. h Honeywell reserves the right to make changes in order to improve design and supply the best products possible. 28 January 1998 HFM5300 HFM5300 Single Fiber Asynchronous Fiber Optic Modem OPERATIONAL MODES Data Transmission Mode: In this mode the RTS and DTR inputs are sampled and passed across the fiber link to appear as CTR and DSR respectivily at the far end modem. Handshake Mode: The modem is configured as a DCE and in this mode the control signals are used as conventional handshake signals with the connected terminal equipment (DTE). DSR - when the modem is powered up DSR goes high to inform the connected DTE that it is connected to a "live" DCE. DTR - when the modem receives a high form the DTE it knows that the DTE is "live" and puts DCD high. RTS - on receiving DCD the DTE responds by putting the RTS high. CTS - on receiving a high RTS the modem puts CTS high to the DTE. If RTS goes low, then CTS goes low. (See also DCD). DCD - on power up of the modem it will communicate across the fiber to achieve synchronization with the corresponding modem at the other end of the fiber. This synchronization is an internal function of the modem. Once synchronization is established, DCD is set high. If synchronization is lost, DCD is set low along with CTS. Active Lock Mode: Active lock mode is used to rapdily synchronise the modems at each end of the link. In normal operation the machine cycles of the optical modems achieve a state whereby the "Receive Window" of the one modem coincides with the "Transmit Window" of the other modem, having allowed for link delay. This will occur as a result of natural drift, since the two crystal oscillator frequencies will never be exactly the same. If the difference in frequencies of the two cummunicating modem's crystal oscillators is very small (a few ppm) then locking could take a relatively long time (tenths of a second). This locking process may be enhanced by invoking the active lock mode. The active lock mode will shorten the machine cycle by 0.5 % which is the equivalent to introducing a crystal which deviated from the nominal value by 5000 ppm, thus ensuring rapid lock. Once synchronization has been achieved, then the machine cycle will revert to its normal length and synchronization is then maintained in the normal way. Active mode is initiated at power up. Honeywell reserves the right to make changes in order to improve design and supply the best products possible. h © Honeywell Inc. 28 January 1998 HFM5300 HFM5300 Single Fiber Asynchronous Fiber Optic Modem ELECTRO-OPTICAL CHARACTERISTICS PARAMETER SYMBOL Lauch Power MIN PÎÏ Link Budget Data Rate f tß ABSOLUTE MAXIMUM RATINGS MODEM UNITS TEST CONDITIONS dBm 12 Power coupled into 1 meter 50/125 µm fiber optic cable with 0.21 NA 38.4 dB kb/s 50 IÙ Crystal Frequency Data Output Fall Time MAX -23 9 DC Supply Current TYP mA 8.86723 850 MHz ns Data line asynchronous Current required if supplied by external source 80%-20% RECOMMENDED OPERATING CONDITIONS Ambient operating temperature 0 to 60¡C 0 to +85¡C Storage temperature Humidity 10 % to 90% non-condensing Attenuation budget Case operating temperature 9 dB (50 µm fiber) 12 dB (62.5 µm fiber) -25 to +70¡C CUBE POWER SUPPLY (SPX5135 SPX5135) Storage temperature -55 to +120¡C Supply voltage +10 VDC AC input voltage 230 VAC Supply current 50 mA DC input voltage (open circuit) +15 V DC output current 105 mA © Honeywell Inc. h Honeywell reserves the right to make changes in order to improve design and supply the best products possible. 28 January 1998 HFM5300 HFM5300 Single Fiber Asynchronous Fiber Optic Modem ORDER GUIDE Description Catalog Listing X = C - Asynchronous - normal operation / D - Asynchronous, active lock - special HFM5300-XYZ HFM5300-XYZ Y = A - SMA - optical port / B - ST¨ - optical port Z = M - Male 25 pin 'D' / F - Female 25 pin 'D' Honeywell reserves the right to make changes in order to improve design and supply the best products possible. h © Honeywell Inc.