Chapter 4 - Bench Tests; General; Testing Considerations; Bench Test With Built-In Signal Generator - TC Communications TC2200R User Manual

Multi-drop (bus) fiber optic modem

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Table Of Contents

Table of Contents

General

It is highly recommended to conduct bench tests before actual installation. Bench testing allows the user to

become familiar with all the functions and features of the TC2200/2201 in a controlled environment.

Knowledge of these functions and features will ease installation and troubleshooting efforts later on.

Testing Considerations

You may substitute the SCADA Host controller with a BERT (Bit Error Rate Tester) test set to generate

a simulated RS-232, RS-422 or RS-485 signal. For each test, double-check the LED indicators and DIP

switch settings on all units.

The Anti-Streaming function applies to both the Data (pin 2 on the DB25's RS-232 interface) and RTS signals

(pin 4 on the DB25's RS-232 interface) from the RTU. The Anti-Streaming function can be disabled by sliding

SW5 on the internal DIP switch to the Left position.

The "BRD" and "RSP" LEDs flash at the rate of the transmitted or received data. If you are sending bus data,

the LEDs will only flash when data is present. Under this condition they may appear dim or even unlit at times.

If this is the case, you may want to increase your data rate and send it in a continuous data format while

testing.

Bench Test With Built-In Signal Generator

The TC2200 (Master) has a built-in signal generator to simulate a broadcast message from a SCADA Host,

while the TC2201 (Slave) has a signal generator to simulate an RTU's response message. The built-in signal

generator is a pulse signal indicated by a blinking LED. The flash rate is intentionally reduced for easy visual

confirmation.

1. Set up the bench test as shown in Figure 16. At the Master unit, turn on the "SIG-GEN" by sliding SW2_3

(on the front panel) downward. The "BRD-1" and "BRD-2" LEDs on the TC2200 (Master) should start

blinking. Likewise, the "BRD-1" and "BRD-2" LEDs on all of the TC2201 (Slave) units should also blink,

indicating receipt of the Master's broadcast signal.

2. At any Slave, turn on the "SIG-GEN" by sliding SW2_3 (on the front panel) downward. The "RSP-1"

and "RSP-2" LEDs should start blinking. Verify that the Master's "RSP-1" and "RSP-2" LEDs also blink,

indicating receipt of the Slave's simulated response.

RxA

TxA

TxB

RxB

Note 1: To perform this test on Multi-Master units, one unit must be configured as a dedicated Master (by sliding SW1_3 to the

Right) and all other units must be configured as dedicated Slaves (by sliding SW1_3 to the Left & SW1_4 to the Right).

*Note 2: For units purchased after February 1, 2006, the settings of SW1_3 are reversed than for the settings shown on the

diagrams above. ; Set SW1_3 to the Left (On) for Master and to the Right (Off) for Slave, see notes1 & 2 on page 6. (Units

bought prior to February 1, 2006 hold the same settings as shown above). The internal DIP Switch functions for Multi-Master

units differ slightly from the Single Master units shown (see page 7).