1.0 General Description

The Model 260 is an interface converter that allows users to link RS-232 and RS-422 equipment. The Model 260 performs dull duplex conversion of data without requiring an external power source.

2.0 Specifications

2.1 Interface – RS-232: Conforms to CCITT V.24 and RS-232, Pins 2 & 3, Transmit and Receive Data. Pin 4 (RTS) tied to Pin 5 (CTS). Pin 6 (DSR), Pin 8 (DCD) and Pin 20 (DTR) are connected together.

RS-422: Conforms to RS-422

2.2 Connectors – Rs-232: DB-25 Male.

RS-422: DB-25 male

2.3 Data Rate – 0 to 19.2 KBPS

2.4 MTBF – 360,000 hours

2.5 Power – Derived form RS-232 interface. Will operate with TD only.

2.6 Size – 2"W x 3.5"L x .75"H

2.7Enviorment – 0 to50C, 0% to 95% RH.

3.0 Installation

The Model 260 is designed to interface RS-232 with RS-422 4 wire devices. The

RS-422 interface pre-sends the transmit signals on Pins 2 (T-) and 14 (T+). The receive signals appear on Pins 3(R-) and 16(R+).

4.0 Operation

The Model 260 is configured as a RS-232 to RS-422 interface converter and as such the unit will perform full duplex conversion of the TD and RD signals. The RS-422 equipment gets connected to the Model 260 through the male DB-25 connector on the pins designated R-, R+, T-, and T+. The R+ and R- are the receiver input into the Model 260 and T+ and T- are the transmitter outputs. When connecting the Model 260 to RS-422 equipment the T+ and T- should be member of one twisted pair while R+ and R- should be members of the other.

5.0 Troubleshooting

To test the Model 260 in the RS-422 mode connect T- to R- (2 to 3) and T+ to R+ (14 to 16). This forms a loop-back connection. Connect the Model 260 RS-232 port to a CRT terminal and hold down a key on the keyboard. If the converter is operating properly the data should appear on the CRT screen.

6.0 Connector Pin Assignment

RS-232

RS-422M

R+ Receive+ 16

R- Receive- 3

T+ Transmit+ 14

T- Transmit- 2

When the RS-232 input signal is – or marking the T- lead will be low and the T+ will be high. To cause the RS-232 output signal to be – or marking the R- should be brought low and the R+ should be high.

7.0 Power

The Model 260 can be powered solely by deriving all voltages from the data input signal or control signals on the RS-232 side. The signals must be a minimum of –5.5 volts in the quiescent state.

8.0 Help

Assistance can be obtained by visiting 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 for use. 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. These deliveries will be sent COD freight and 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 number (RMA) is necessary. Assistance can be obtained by visiting our Technical Support Center.

Document No. 0315-0217/Rev. A