Model 9365


RS-422/RS-485
to RS-232
Interface Converter

Reference Manual for Product:
0315-0320 Rev. A

Printed 11.08.02


Table of Contents

1.0 General Description
1.1 DataSpy™ Feature
2.0 Specifications
2.1 Interface
2.2 Connectors
2.3 Data Rate
2.4 Switches
2.5 Indicators
2.6 Power
2.7 Size
2.8 Environment
3.0 Installation
4.0 Operation 
4.1 RS-422
4.2 RS-485
5.0 Troubleshooting
6.0 RS-232 Pin-Number Assignments
7.0 Power
8.0 Help
Warranty

1.0 General Description

The Model 9365 is a unique interface converter that allows the user to operate RS-232 to RS-422 or RS-232 to RS-485. Furthermore, the RS-485 mode is selectable for two-wire or four-wire operation.

The Model 9365 comes equipped with a five-position dip switch used to set the operating mode and a "DTE/DCE" switch. In addition, the unit is equipped with a Dataspytm LCD display to verify operation.

1.1 DataSpy™ Feature

Your new Telebyte product incorporates the patent-pending DataSpy™ feature, an LCD display designed to provide meaningful information to the user. It will assist in the initial installation and check out; thereafter it can be used as a performance monitor. In the case of a system problem, it provides information as to the status of the local link.

The Telebyte logo shown on the LCD display indicates the unit is powered. For power-stealing devices such as a converter, it is an indication that sufficient power is being applied to operate the device. The LCD display uses less than 1 milliWatt of power.

The data display on the LCD consists of graphical representations of TD (Transmit Data) and RD (Receive Data). Each of these signals is displayed the way a bit-change waveform would appear on an oscilloscope. Ordinarily, TD and RD are low or a minus voltage in the quiescent state. When data is transmitted, the transmit signal is brought high to a positive voltage. These two signal states are displayed on the LCD by either a low segment or a high segment. The low segment represents the minus voltage (the mark condition) while the upper segment represents a positive voltage (the space condition). The vertical bar connecting the lower segment to the upper segment is always on when power is applied.

If the transmit signal is in the quiescent state (continuously low) only the lower segments and the vertical bar will be illuminated. This indicates a constant negative state. If the transmit or receive inputs to the device were streaming, i.e., in the positive mode continuously, the LCD display would show the vertical segment and the upper segments only. For those cases where there is valid data transmission, both the upper and lower segments will be displayed simultaneously. A variation in display intensity between lower and upper segments will give the user a perception of the amount of data being transmitted.

The LCD display also shows the status of the following control signals: CTS, RTS, DSR, DCD, and DTR. These signals are displayed as mnemonic symbols, composed of three letters each, on the bottom line of the display. The presence of the three-letter mnemonic indicates that the respective control signal is high or positive. If the control signal is negative, the three-letter mnemonic is not displayed. For most full-duplex data-only converters, CTS and RTS are connected together while DSR, DCD, and DTR are connected together. The DataSpy™ LCD display will help verify correct operation.

2.0 Specifications

2.1 Interface

Conforms to EIA RS-232, RS-422 and RS-485 specifications.

2.2 Connectors

RS-232: DB9 Female

422/RS-485

Four-position terminal block

2.3 Data Rate

0 to 115 KBPS

2.4 Switches

"DTE/DCE" switch for reversing TD & RD

DCE is towards the DB9 connector

Five-position dip switch:

-set RS-485 to two- or four-wire

-RS-422

-termination

2.5 Indicators

Dataspytm LCD display.

2.6 Power

+12VDC @ 300mA from transformer 115VAC

1510-0033 or 1510-0034 for 220VAC option

2.7 Size

2.0" W x 3.3" L x 1.45" H

5.0 cm x 8.4 cm x 3.7 cm

2.8 Environment

0o to 50o C, 5% to 95% Relative Humidity

3.0 Installation

The Model 9365 is designed to interface RS-232 with either RS-422 four-wire, RS-485 four-wire or RS-485 two-wire. In addition, the RS-485 mode can be set to have its transmitter enabled by RTS or to sense when data is being transmitted by an RS-232 device.

Note: In this mode the RS-485 driver is active for a transmitted "0" bit and in the high-impedance state for the transmitted "1." This approach to RS-485 operation is compatible with most RS-485 systems.

The user also has the ability to enable a 220-Ohm terminator when the Model 9365 is configured in the two-wire mode. To set the dip switches, select an option from the chart that follows.

 

 

SW1

SW2

SW3

SW4

SW5

 

TD
Control

RTS
Control

220W
Term

2-wire
Mode

4-wire
Mode

RS-422

OFF

OFF

OFF

OFF

ON

RS-485 4-Wire Transmitter enabled by RTS

OFF

ON

OFF

OFF

ON

RS-485 4-Wire Transmitter enabled by TD

ON

OFF

OFF

OFF

ON

RS-485 2-Wire Transmitter enabled by RTS

OFF

ON

X

ON

OFF

RS-485 2-Wire Transmitter enabled by TD

ON

OFF

X

ON

OFF

On = Closed       Off = Open

Note: X = Enable (ON) / Disable (OFF) 220 Ohm Terminator. The 220 terminator should only be selected for use with RS-485 two-wire options.

After setting the five-position dip switch, determine if the Model 9365 will function as a DCE or a DTE device. When configured as a DCE, the Model 9365 connects to a DTE device such as a PC or terminal. When set as DTE, the unit connects to a DCE device such as a modem. The DTE position is away from the DB9 connector.

The Model 9365 has built-in protection to help prevent damage to the unit from surges. The surge suppression is connected internally to pin five, "Signal Ground." This connection provides a path for the discharge of the surge.

4.0 Operation

4.1 RS-422

When the Model 9365 is configured as an RS-232 to RS-422 converter it will perform full duplex conversion of TD and RD signals. The RS-422 equipment is connected to the Model 9365 through the four-position terminal block marked "R-," "R+," "T-" and "T+." The "R+" and "R-" positions are the receiver inputs into the Model 9365 and the "T+" and "T-" positions are the transmitter outputs. When connecting the Model 9365 to other RS-422 equipment, positions "T+" and "T-" should be one twisted-pair while "R+" and "R-" should be the other.

4.2 RS-485

In the four-wire mode, the Model 9365 receiver is always ON and the transmitter can be controlled in one of two ways.

Method One: The transmitter can be enabled when the RTS (or CTS) is enabled or goes high (positive voltage).

Method Two: Turn the transmitter ON when data is applied to the Model 9365 from an RS-232 device. Connection to the Model 9365 is made to the terminal block with "T+" and "T-" as the transmit pair and "R+" and "R-" as the receive pair. When operating in the four-wire mode "T+" and "T-" should be one twisted pair; "R+" and "R-" should be the other.

The RS-485 two-wire mode uses one twisted pair to transmit and receive "T+" and "T-." The Model 9365 will normally be in the Receive mode or waiting for data from the RS-485 equipment. When the Model 9365 attempts to transmit it uses RTS or waits for data from an RS-232 to enable its transmitters, depending on the mode it is set for. The Model 9365 uses the "T+" and "T-" for its connections to an RS-485 two-wire device.

5.0 Troubleshooting

The following is a list of possible problems that may arise during installation:

1. The data being received is garbled.

Possible reason/solution:

a) The "DTE/DCE" switch is not set properly (see section 3.0, "Installation").

b) The Model 9365 and the equipment it is connected to do not have the same communications parameters.

c) Positions "T+" and "T-" are reversed going to "R+" and "R-." Look at the LCD display, if the right-hand segment is high (positive voltage) continuously then the leads are reversed.

d) One of the four wires is broken.

e) The wires are not paired properly. Positions "T+" and "T-" should be one twisted pair and "R+" and "R-" should be the other pair.

2. No data is being received.

a) The equipment not connected to the Model 9365.

b) The "DTE/DCE" switch is not set properly (see section 3.0, "Installation").

c) One or more wires between the modems are open.

d) The link connection exceeds the maximum specified distance.

To verify that the unit is not defective:

Operation can be verified if one of the devices to which the converter is attached is capable of operating in a full-duplex mode (e.g., a terminal or PC using a communications package such as Procomm).

1)     Connect the Model 9365 to a terminal through the RS-232 connector and make the following loopback connections at the analog interface:

     "T+" to "R+" and "T-" to "R-"

2)     If the modem is functioning correctly, any data entered on the keyboard should appear on the screen.

6.0 RS-232 Pin-Number Assignments

Pin

EIA

CCITT

Name

Pin

3

BA

103

Transmit Data

*

2

BB

104

Receive Data

*

7

CA

105

Request to Send

**

8

CB

106

Clear to Send

**

6

CC

107

Data Set Ready

***

5

AB

102

Signal Ground

Gnd

1

CF

109

Data Carrier Detect

***

4

CD

108.2

Data Terminal Ready

***

* These signals can be reversed using the selector switch.
**, *** Connected together.

7.0 Power

The power required for the Model 9365 is +12VDC @ 300mA. There is a transformer supplied with the unit. Verify that the connector is connected to the unit before power is supplied.

8.0 Help

If you require assistance, please visit our Technical Support Center.

Warranty

TELEBYTE warrants the equipment to be free from defects in material and workmanship, under normal and proper use and in its unmodified condition, for 12 months, starting on the date it is delivered to you. TELEBYTE's sole obligation under this warranty shall be to furnish parts and labor for the repair or replacement of products found by TELEBYTE to be defective in material or workmanship during the warranty period. Warranty repairs will be performed at the point of manufacture. Equipment approved for return for warranty service shall be returned F.O.B. TELEBYTE factory and will be redelivered by TELEBYTE freight prepaid, except for non-continental U.S.A. locations. Non-continental deliveries will be sent COD freight plus import/export charges.

The above warranty is in lieu of all other warranties, expressed or implied, statutory or otherwise, including any implied warranty of merchantability or fitness for a particular purpose. TELEBYTE shall not be liable for any damages sustained by reseller or any other party arising from or relating to any equipment failure, including, but not limited to consequential damages nor shall TELEBYTE have any liability for delays in replacement or repair of equipment.

Out of warranty equipment may be returned to the Greenlawn, NY customer service facility prepaid as described above. Return shipping charges will be billed to the customer. The repaired unit will have a 90-day warranty. In those cases where "NO TROUBLE" is found, a reduced charge will be billed to cover handling, testing and packaging.

Whether in or out of warranty, a Return Material Authorization (RMA) number is necessary aand can be obtained by visiting our Technical Support Center.  Reference the RMA number on the outside container.

Document: 0315-0320 Rev A

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