RAD FOM-485

ORDERING FOM-485 FOM-485/*/& Asynchronous RS-485 Asynchronous RS-485 Miniature Fiber Optic Modem Miniature Fiber Optic Modem * Specify fiber optic connector: ST85 for ST type, 850 nm multimode ST13 for ST type, 1300 nm single mode FC85 for FC type, 850 nm multimode FC13 for FC type, 1300 nm single mode SC85 for SC type, 850 nm multimode SC13 for SC type, 1300 nm single mode & Specify DTE connector: RJ45 for RJ-45 TB for terminal block P/S-AC/9/500 9 VDC / 90 to 264 VAC, 500 mA power supply 319-100-08/00 Specifications are subject to change without prior notice.  2000 RAD Data Communications Ltd. FEATURES DESCRIPTION SPECIFICATIONS • FOM-485, asynchronous RS-485 miniature DTE Interface • Provides asynchronous transmission up fiber optic modem, provides the capability • Type to 115.2 kbps of transmitting an RS-485 or V.11 signal via a User-selectable: fiber optic link. FOM-485 is typically used • Operates full duplex over 4-wire or half V.11 over 4-wire for data transmission in utility applications. duplex over 2-wire and 4-wire RS-485 over 2-wire or 4-wire The asynchronous data rate can be up to 115.2 kbps in full or half duplex mode. • Meets ITU RS-485 and ITU V.11 • Data Rate requirements • FOM-485 performs diagnostic loopbacks in Up to 115.2 kbps compliance with ITU V.54 standard. Two • Pulse Width Distortion • Meets ITU V.54 and ITU V.52 V.54 loopbacks are available: local analog Less than 25% requirements (in V.11 only) (Loop 3) and remote digital (Loop 2), activated via external DIP switches. Local • Transmission Mode • Operates over multimode or single digital loopback is also available. The Full or half duplex, user-selectable mode fiber optic loopbacks are available in V.11 mode only. • Connectors • Point-to-point or multipoint applications • FOM-485 includes a built-in V.52 standard RJ-45 or 5-clip terminal block (see Ordering) BER tester for testing link integrity. The with up to 32 units in RS-485 internal BER tester is activated by an external Fiber Optic Interface • Six LED indicators DIP switch. The ERR LED blinks when an • Transmission Line error is detected in the data transmission. • Miniature, lightweight, easy to install Optical duplex cable • FOM-485 incorporates all the advantages of • Operates with an external power supply a fiber optic system, providing: • Transmission Mode Full or half duplex Lower attenuation than with copper wire APPLICATION EMI/RFI immunity, saving the cost of • Optical Output Level expensive and heavy shielding, and -18 dBm over 62.5/125 fiber complex error checking routines -18 dBm over 9/125 fiber Almost absolute security and reduction in • Optical Wavelength the cost of data encryption 850 nm, multimode Eavesdropping is virtually impossible as 1300 nm, single mode (see Ordering) negligible power is radiated from the fiber • Fiber Optic Connectors Safety and electrical isolation: no spark ST, FC or SC (see Ordering) hazard and no ground-loop noise • Operating Budget problems. Up to 22 dB in full duplex (for 850 nm) • FOM-485 operates with an external 9 VDC Up to 24 dB in full duplex (for 1300 nm) 300 mA power supply. General Declaration of Conformity INSTALLATION • Indicators Caution. Be careful when setting jumpers or Mfr. Name: RAD Data Communications Ltd. TD (yellow) – Transmit data performing any actions within the product so that you Mfr. Address: 12 Hanechoshet St. RD (yellow) – Receive data do not bend or break any components. Tel Aviv 69710 ERR (yellow) – BERT error Israel RTS (yellow) – Request to Send Installation of FOM-485 is simple and DCD (yellow) – Data Carrier Detect declares that the product: straightforward. Follow these instructions: TST (red) – A test is active 1. Open the unit by pressing the places marked Product Name: FOM-485 on the sides. • Power 9 VDC, 300 mA Conforms to the following standard(s) or other 2. Configure the modem according to the normative document(s): desired mode, referring to Figure 1 and • Physical EMC: EN 55022 (1994): Limits and Table 2. Length: 100 mm / 3.9 in methods of measurement of radio Height: 23 mm / 0.9 in disturbance characteristics of Width: 53 mm / 2.1 in information technology equipment. Weight: 140g / 4.9 oz EN 50082-1 (1992): Electromagnetic compatibility – Generic immunity • Environment standards for residential, commercial Temperature: 0–50°C / 32–122°F and light industry. Humidity: Up to 90%, non-condensing Supplementary Information: The product herewith complies with the requirements of the EMC Directive 89/336/EEC. The product was tested in a typical configuration. Figure 1. DIP Switch Locations Tel Aviv, August 3rd 1999 V.11 Operation (4-wire, Full Duplex) 3a. Set the H.D./F.D. switch to F.D. 4a. Set the 4W/2W switch to 4W. Haim Karshen VP Quality 5a. Set the CARR. HOLD switch to 4.4 msec. European Contact: RAD Data Communications GmbH, RS-485 Operation (4-wire, Half Duplex) Berner Strasse 77, 60437 Frankfurt am Main, Germany 3b. Set the H.D./F.D. switch to H.D. 4b. Set the 4W/2W switch to 4W. 5b. Set the CARR. HOLD switch to 4.4 msec. RS-485 Operation (2-wire, Half Duplex) • For RJ-45: 3c. Set the H.D./F.D. switch to H.D. Plug the cable into the RJ-45 jack (see Figure 3). 4c. Set the 4W/2W switch to 2W. 5c. Set the CARR. HOLD switch according to your application requirements. 6. Close the unit by pressing the two halves of the unit together. 7. Connect the DTE: • For terminal block: Figure 3. RJ-45 Connector Pinout Connect the 4- or 2-wire UTP or STP 8. Connect the line: line, observing the following polarity: 4-wire: TDA and TDB clips are data Remove the plastic dust caps from the fiber optic connectors, and connect the cable, output from the modem; RDA and observing the following polarity: RDB clips are data input to the modem (see Figure 2). • TX on the local modem should be 2-wire: RDA and RDB clips are data connected to RX on the remote modem input/output in and from the modem • RX on the local modem should be (see Figure 2). connected to TX on the remote modem. 9. Connect the external power supply to FOM-485, and then plug it into the mains. Figure 2. Terminal Block Connector Pinout Table 1. DIP Switch Settings Switch Switch Function Possible Settings Factory Identity Setting S3-1 H.D./F.D. Selects the transmission H.D. – Half duplex operation, RS-485 H.D. mode on the DTE side F.D. – Full duplex operation, V.11 S3-2 4W/2W Selects the operation type of 4W – 4-wire operation the RS-485 interface 2W – 2-wire operation 2W S2-1, CARR. Selects the length of time that 1.1 msec S2-2, HOLD the modem maintains 4.4 msec 4.4 msec S2-3, transmission when received S2-4 data from RS-485 interface 8.8 msec becomes mark or idle (carrier 17.7 msec delay). Note: Set the carrier delay to 1.1 msec when working at the high data rate. For the low data rate applications, set the carrier delay to 17.7 msec. S1-1 PATT Controls the BER testing See Operation OFF S1-2 DIG Controls the local digital See Operation OFF loopback S1-3 ANA Controls the local analog See Operation OFF loopback S1-4 REM Controls the remote digital See Operation OFF loopback V.54 Diagnostics OPERATION FOM-485 features diagnostic loopbacks • Normal Operation according to ITU V.54. The modem For normal operation, make sure that the performs local analog loopback (ANA), local test and diagnostic switches (S1-1, S1-2, and remote digital loopback (DIG, REM). All S1-3 and S1-4) are set to OFF. tests are controlled by the S1-2, S1-3, S1-4 • Tests and Diagnostics switches. BERT Test Mode V.52 The TST LED turns on when a diagnostic loopback is active. BERT enables testing of the local modem and the communication line. When the The ANA V.54 loopback (Loop 3) tests the PATT DIP switch is set to ON, the modem local FOM-485 only. The XMT signal is generates and transmits standard V.52 returned to the receiver (see Figure 4). pattern (511-bit pseudo-random) and checks its response. If errors are detected, the ERR indicator LED lights. The test can be carried out in local analog loopback, in remote Figure 4. Analog Loopback (ANA) digital loop, or in normal point-to-point operation, opposite a remote modem. The REM V.54 loopback (Loop 2) tests the remote modem and the communication link (see Figure 5). Figure 5. Remote Digital Loopback (REM) To return to normal operation, set the test DIP switches to OFF.