INDUSTRIAL I/O SOLUTIONS Model 4683-TTM-x RS-485 TO RS-485 Network Repeater Acromag’s RS-485 network repeater device allows users to take full advantage of the RS-485 stan- dard’s extended communication distances and multi-dropping capabilities. In addition, these Acromag’s network repeaters isolate and boost RS-485 signals allowing communication signals to travel another 4000 ft. devices offer field selectable End-of-Line Network (EOLN) terminations on both the A and B networks. disabled (out of the circuit) when the pair jumpers are Operation positioned over pins 2 and 3. The Model 4683-TTM-1(2) network repeaters isolate and Operation is transparent to all devices and no boost RS-485 signals allowing communication signals to Duplex: Half duplex only. handshaking is required. Up to thirty-two RS-485 travel another 4000 ft. Each repeater permits the addi- Data Format: Ten bits typical (1 start bit, 8 data bits, devices can be driven. Network repeaters are tion of another thirty-two unit loads to a network. and 1 stop bit). Other formats are supported. ready to mount on any base plate. Or, for a harsh The repeater has two RS-485 “sides” known as the A environment, it can be installed in a NEMA enclo- and B sides. The A side typically connects to the net- Physical Specifications work towards the host and the B side connects to the Operating Temp. Range: 0 to 70° C (32 to 158° F). sure of your choice. No enclosure is necessary for extended network. Functionally, the A and B sides are use in a laboratory or office. Installation requires Storage Temp. Range: -25 to +85° C (-13 to 185° F). equivalent. mounting, connecting power and cables, and set- Relative Humidity (RH): 10 to 95% RH (noncondensing), The repeater receives AC power through a three-screw up to 40° C (104° F). ting the baud rate. terminal strip. Transient signal protection is provided on Power: Model 4683-TTM-1 - 115VAC both RS-485 sides. +/-10%, 50/60 Hz, 0.05A Features When both RS-485 lines are idle, each side is in the Model 4683-TTM-2 - 230VAC • No handshaking. receive mode. When a one to zero transition is detected +/-10%, 50/60 Hz, 0.03A (signifying a start bit) on either side, the opposite side’s • No extra control lines. transmitter is enabled. The transmitter stays enabled for Power Line Fuse: 0.5A, 250V, 3AG type. one character’s time (based on the baud rate switch set- • I/O signal isolation. Isolation: The network repeater provides galvanic and ting). The character received is then passed through. opto-coupler isolation between RS-485(A), RS-485(B), • Baud rates of 300, 600, 1200, 2400, 4800, AC power, and chassis ground. Common mode volt- Communications Specifications 9600, 19.2K, and 38.4K are switch selectable. ages are permitted up to 250V rms or 354V DC (with- Baud Rates: Switch settings on unit for 300, 600, stands a 1500V AC dielectric strength test for 1 min. • Field-selectable end-of-line network terminations 1200, 2400, 4800, 9600, 19.2K, and 38.4K baud without breakdown) on a continuous basis. Complies on both A and B sides. rates. Switch must be in the proper baud rate posi- with test requirements outlined in ANSI C39.5-1974 tion for proper operation. for voltage ratings specificed. • Electrical transient protection is provided. This RS-485 Bus Loading: One unit load equivalent. RFI Resistance: Withstands an RFI field strength of 10V protects the host computer from destructive RS-485 Bus Drive: Complete RS-485 compliance for up per meter at 27 Mhz, 151 Mhz, and 467 Mhz with no noise spikes and other transient signals. to 32 unit loads (31 unit loads if a repeater is used). digital effect, per SAMA PMC 33.1 test procedures. • Status LED’s indicate transmission direction, End-of-Line Termination Network: Line Noise Effects: Field and power line terminals with- RS-485 bus fault conditions, and power applied. stand ANSI/IEEE C37.90-1978 Surge Withstanding The EOLN termination network Capability (SWC) Test with no component failures. is shown on the right and is • 115V and 230V AC power models available. 1200 Unit is tested to a standardized test waveform that is individually selected on both Ohms representative of surges (high-freq. transient electrical the A and B sides by a pair D Ordering Information 32 1 interference), observed in actual installations. of shorting clips. The A-side 220 is controlled by jumper pair Ohms 4683-TTM-1 for 115V AC Power Communications Connections: Network repeater - both J1, J2 and the B-side is RS-485 conn. use modular terminal blocks with screw D 4683-TTM-2 for 230V AC Power 32 1 controlled by jumper pair J3 clamps. Wire range 14 to 26 AWG, CSA approval. 1200 Ohms and J4. Power Wire Connections: Network repeater term. block. The EOLN termination network See label on unit for power to be applied to unit. is enabled for the A side or Approvals: UL Listed, CSA Certified file LR25710. B side when the associated pair of jumpers are posi- Shipping Weight: 3.0 pounds (1.4 kg) packed per unit. tioned over pins 1 and 2. Conversely, the EOLN is Acromag, Inc. Tel: 248-624-1541 Fax: 248-624-9234 E-mail: sales@acromag.com http://www.acromag.com 8400-204 Printed in USA 12/97 Copyright © Acromag, Inc. 1997 Data subject to change without notice. INDUSTRIAL I/O SOLUTIONS Acromag, Inc. Tel: 248-624-1541 Fax: 248-624-9234 E-mail: sales@acromag.com http://www.acromag.cm 8400-204 Printed in USA 12/97 Copyright © Acromag, Inc. 1997 Data subject to change without notice.