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CUSTOMER

SUPPORT

INFORMATION

Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]

AUGUST 1999

ME742A-R3
ME742C-R3

BC00703

FA520A-R2

RS-232/RS-485 Synchronous

Multipoint Line Driver (LD485S-MP)

LD485S-MP

RTS CD TD RD PWR

DLB LLB TEST

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Summary of Contents for LD485S-MP

Page 1: ...hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com AUGUST 1999 M...

Page 2: ...1 TRADEMARKS TRADEMARKS USED IN THIS MANUAL Any trademarks used in this manual are acknowledged to be the property of the trademark owners...

Page 3: ...ent is operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whateve...

Page 4: ...ato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo el ctrico m s all a lo descrito en las in...

Page 5: ...una antena externa deber ser localizada lejos de las lineas de energia 16 El cable de corriente deber ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado debe...

Page 6: ...Panel Connectors 12 3 Configuration 13 3 1 Switches 15 3 1 1 Baud Rate 15 3 1 2 Transmit Data Clock 16 3 1 3 Node Termination Switch 7 17 3 2 Jumpers 17 3 2 1 Constant Carriers or Switched Modes 17 3...

Page 7: ...Switched Mode Pins Supported RS 232 C 1 2 3 4 5 6 7 8 9 10 15 17 20 24 RS 485 TX A TX B RX A RX B RTS CTS Delay 0 11 50 or 160 ms Connectors 1 DB25 female 1 4 screw terminal block Indicators 5 LEDs T...

Page 8: ...iles 6 4 km 2400 3 miles 4 8 km 4800 2 3 miles 3 68 km 9600 1 7 miles 2 72 km 19 200 1 2 miles 1 92 km 38 400 0 9 mile 1 44 km 56 000 0 8 mile 1 28 km 64 000 0 75 mile 1 2 km 112 000 0 55 mile 0 88 km...

Page 9: ...TS 5 Clear To Send CTS 6 Data Set Ready DSR 7 Signal Ground SG 8 Receive Line Signal Detector CD 9 Aux power 12V through 560 ohms 10 Aux power 12V through 560 ohms 15 Transmitter Signal Element Timing...

Page 10: ...he LD485S has an RS 232 port configured as DCE that connects to a host computer or terminal DTE and a 4 screw terminal block for RS 485 communication over a 2 or 4 wire line Transmission can be two wi...

Page 11: ...2 1 and 2 2 A multidrop network can accommodate up to 64 devices Figure 2 1 Point To Point Synchronous Application Figure 2 2 Multipoint Synchronous Application IBM 3274 Controller PC with 3270 Emula...

Page 12: ...Mode pertains to full duplex or simplex operation only In Switched Mode the RTS LED will only be on if RTS is asserted causing the remote Line Driver s CD LED to light CD Indicates status of remote L...

Page 13: ...ectors are located on the LD485S s rear panel One DB25 female connector configured as DCE connects the line driver to an RS 232 DTE device One 4 screw terminal block for RS 485 communication between t...

Page 14: ...ches Each option is discussed in detail in Sections 3 1 and 3 2 Figure 3 1 Inter Connect Wiring Diagram THESE UNITS ARE SLAVES IF MULTI POINT THESE UNITS ARE SLAVES IF MULTI POINT 2 WIRE CONNECTION HA...

Page 15: ...RD TD CD RTS TST LLB DLB TRANSMIT CLOCK SELECT S6 O N O F F 4 3 2 1 W1 W3 RXB RXA TXB TXA TB1 P1 O F F O N S7 1 2 3 4 2 1 BAUD RATE SETTINGS O N O F F 8 7 6 5 4 3 2 1 S5 S4 O N O F F 4 3 2 1 50ms W2...

Page 16: ...maximum transmission distances NOTE The baud rate should be set to match the rate of the attached DTE Table 3 1 Baud Rate Settings Switches 4 5 Baud Switch 4 Position Switch 5 Position Rate bps 4 3 2...

Page 17: ...ng of data received from the remote device The DTE then presents synchronized data to the LD485S on Pin 2 External Clock Clocking is determined by local DTE The clock is presented to the Line Driver o...

Page 18: ...CONSTANT CARRIER OR SWITCHED MODE Jumper W2 is used to select Constant Carrier or Switched Mode This option determines the use of the Request To Send signal with selection dependent on your particular...

Page 19: ...lecting Constant Carrier or Switched Mode Operating Mode Constant Carrier or Switched Mode 2 Wire Point to Point Both Line Drivers in Switched Mode 4 Wire Point to Point User s option for both units n...

Page 20: ...is full duplex 3 2 4 TYING SIGNAL GROUND TO FRAME GROUND Jumper W1 provides the option of tying signal ground to frame ground The position is left open at the factory If signal ground is to be connec...

Page 21: ...via the 4 screw terminal block on the unit s rear panel Refer to the Inter Connect Wiring Diagram in Chapter 3 4 To verify the communications link power on the unit and perform the Digital Loopback T...

Page 22: ...rly the RD indicator on any unit receiving this pattern will flash and then go off This indicates the correct reception and decoding of marking data The two loopback switches DLB digital loopback and...

Page 23: ...Test button As each unit s Test button is pressed the RD indicator should flash then go off This tests the internal circuitry of the line driver If a unit does not pass this test it is defective 3 In...

Page 24: ...A to A B to B must be observed The maximum link distance has been exceeded Check by selecting a lower baud rate If the units function at a lower baud rate the distance has been exceeded Unsuitable lin...

Page 25: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 1999 Black Box Corporation All rights reserved...

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