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TC Communications TC1540 User Manual

Rs-232/rs-422/rs-485 fiber optic modem
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TC1540
RS-232/RS-422/RS-485
FIBER OPTIC MODEM
User's Manual
MODEL:
S/N:
DATE:
Although every effort has been made to insure that this manual is current
and accurate as of date of publication, no guarantee is given or implied
that this document is error free or accurate with regard to any specifica-
tion. TC Communications, Inc. reserves the right to change or modify
the contents of this manual at any time without prior notification.
©
COPYRIGHT 1992-2007. ALL RIGHTS RESERVED.
Notice!

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Summary of Contents for TC Communications TC1540

  • Page 1 TC Communications, Inc. reserves the right to change or modify the contents of this manual at any time without prior notification.

  • Page 2: Table Of Contents

    TC1540D User's Manual Rev. 1.2 Table Of Contents Chapter 1 - Overview ....................3 Description ............................3 DIP Switch Functions ........................5 LED Functions ............................ 5 Theory of 2 and 4-Wire RS-485 Operation ..................6 RS-485 Transition Timer Setup ....................... 7 RS-422 &...

  • Page 3: Chapter 1 - Overview

    The RS-422/485 interface is standard; RS-232 interfaces are optional. Different interfaces can be interconnected. The TC1540 is equipped with eight DIP switches and eight LED indicators (on the top cover) to facilitate installation and troubleshooting.
  • Page 4 ON(1) RS422 10-14VDC RS485 18-36VDC 36-72VDC RS-422/485 input DC Power Input Optic Transmitter "TxA" terminal block 9V to 12V DC@250mA Optic Receiver "RxA" Signal Ground RS-422/485 output (2-wire RS-485) terminal block Figure 2. TC1540 with RS-422/RS-485 Interface - 4 -...

  • Page 5: Dip Switch Functions

    It should be kept at left position for normal operation. SW5 - Not used SW6, SW7, SW8 - Set the RS-485 transition timer (see Table 1) Figure 3. TC1540's DIP Switch Functions LED Functions Power Indicator: On - Unit's power supply is adequate...

  • Page 6: Theory Of 2 And 4-Wire Rs-485 Operation

    From the user's point-of-view, both channels are in the receiving or transmitting mode at all times. The RS-485 Driver/Receiver transition time is determined by three DIP switches on the TC1540. The local unit's RS-485 transceiver changes to transmit (Tx) mode upon receiving the first bit of data from the remote unit.

  • Page 7: Rs-485 Transition Timer Setup

    The termination resistors are 100 to 130 ohm resistors located inside the TC1540. Two jumpers, identified as board locations "W1" & "W5," control the termination resistance on each unit (installed by default).

  • Page 8: Pin Assignments And Connection

    Rev. 1.2 Pin Assignments and Connection The removable terminal blocks on the TC1540 factory configured as DCE. The pin assignments for each type of interface are illustrated below. Pins IN(-) & IN(+) are inputs and Pins OUT(-) & OUT(+) are outputs (or input/output for 2-Wire RS-485).
  • Page 9 TC1540D User's Manual Rev. 1.2 User's Device To/From Fiber OUT- Rs232 Drv/Rcv TC1540 Figures 10, 2-wire RS-232 Connection/Logic Diagram - 9 -...

  • Page 10: Transmission Distances (Typical)

    *Launch power, sensitivity and distance are listed for reference only. These numbers may vary. Power Supply Typically, a 9V to 12V DC power supply @250mA is adequate for the TC1540. The power plug is a terminal block connector with positive & negative polarity indicated on the top panel of the unit. Alternate power sources are available as an option (see Chapter 5 - Specifications).

  • Page 11: Chapter 2 - Installation

    D. Connect the remote device's RS-232, RS-422 or RS-485 signal to the DB25 connector on the rear panel of a second TC1540. Connect power to the unit. Observe that the "TD" LED flashes when an incoming signal is transmitted from that unit's local device. Verify that the "RD" LED on the remote TC1540 also flashes when an incoming signal is received from the remote unit.

  • Page 12: Installation Example (For 2-Wire Rs-485 Application)

    TC1540D User's Manual Rev. 1.2 Installation Example (for 2-wire RS-485 application) Figure 11 depicts a typical 2-wire RS-485 application. The host controller polls the status of the remote RTU through a 2-wire RS-485 bus. Once the remote RTU receives the polling message, it answers with a response signal.
  • Page 13 TC1540D User's Manual Rev. 1.2 4-wire RS-485 Quick Installation (local & remote Units) Figure 12. 4-Wire RS-485 Installation Diagram - 13 -...

  • Page 14: Chapter 3 - Troubleshooting

    Rev. 1.2 Chapter 3 - Troubleshooting General Alarm conditions occur whenever an optical problem or "fault" condition is detected by the TC1540. Under normal operation, following LEDs should be lit "POWER," "O-SYNC," "TD," and " RD." Following LEDs may be "ON" or "OFF" depend on applications: "COLL"- for trouble-shoot, not used.
  • Page 15 TC1540D User's Manual Rev. 1.2 The TC1540 is designed with easy troubleshooting in mind. The LED indicators and DIP switches on the top cover will support various diagnostic functions. The first step in troubleshooting is to determine whether the problem is optical or electrical in nature. Figure 12 describes the steps required to isolate the problem.

  • Page 16: Chapter 4 - Bench Tests

    1. Set up the bench test as shown in Figure 14. At the local TC1540 unit, turn on the "SIGGEN" by sliding SW3 to the Right. The "TD" LED on the local TC1540 should start blinking. Likewise, the "RD" LED on the remote TC1540 should also blink, indicating receipt of the local unit's simulated polling message.

  • Page 17: Optic Loopback Bench Test

    "Tx" to optic "Rx." Set all the DIP switchs to the Left position. Connect a BERT tester to the TC1540 according to Fig. 15. Set the tester up as a DTE device. The BERT tester should indicate a "SYNC" signal.

  • Page 18: Local Electrical Loopback Bench Test

    DTE device if RS-530 or RS-449 interface is used. "TD" and "RD" LEDs should light on the TC1540, indicating the status of the looped signal. The BERT tester should indicate a "SYNC" signal. This test should be performed on each individual unit in the application.

  • Page 19: Remote Loopback Bench Test

    DTE device (refer Fig. 15 for DTE device connection). The "TD" and "xD" LEDs (on both TC1540 units) should light, indicating the status of the looped signal. The BERT tester should indicate a "SYNC" signal. This test can be performed from either (or both) direction(s).

  • Page 20: Chapter 5 - Specifications

    TC1540D User's Manual Rev. 1.2 Chapter 5 - Specifications Data Rates Async ....................up to 500 Kbps** Optical Transmitter ...................... LED/ELED Receiver ......................PIN Diode Wavelength ................850nm/1310nm Multimode ....................... 1310nm Single Mode Fiber Optic Connectors ..............*ST (FC optional) Loss Budget ...........

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