1.0 General Description

The Model 263 is an interface converter that allows users to link RS-232 and RS-422 equipment. The Model 263 comes equipped with a DTE\DCE switch and the choice of screw terminals and RJ-11 modular connector for the RS-422 differential input and output.

2.0 Specifications

Interface:
RS-232: Conforms to CITT V.24 and RS-232. Pins 2 & 3, Transmit and Receive Data, switch selectable. Pin 4 (RTS) tied to Pin 5 (CTS). Pins 6 (DSR), 8 (DCD) and 20 (DTR) are connected together.
RS-422: Conforms to RS-422

Connectors:
RS-232: DB-25 male or female as ordered.
RS-422: 4 position terminal strip and RJ-11 connector.

Switches: DTE\DCE switch selectable for reversing TD & RD.

MTBF: 360,000 hours

Power: Derived form RS-232 interface. Will operate with TD and ground only.

Size: 2"W x 2.75"L x .75"H

Environment: 0° to 50° C, 5 to 95% RH (no condensation)

3.0 Installation

The Model 263 is designed to interface RS-232 with RS-422 4 wire devices.

The user must determine if the Model 263 will look like a DCE or DTE device such as a PC or terminal. When set as DTE the 263 will connect to a DCE device such as a modem.

4.0 Operation

The Model 263 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 263 through the 4 position terminal block marked R-, R+, T- and T+. The R+ and R- are the receiver input into the Model 263 and T+ and T- are the transmitter outputs. When connecting the Model 263 to RS-422 equipment, the T+ and T- should be members of one twisted pair while R+ and R- should be members of the other.

5.0 Troubleshooting

To test the Model 263 connect T+ to R+ and T- to R- with 2 jumper wires. This forms a loop-back connection. Connect the Model 263 RS-232 port to a CRT terminal and hold down a key on the keyboard (Model 263 DTE / DCE switch should be set to DCE). If the converter is operating properly the data should appear on the CRT screen.

6.0 Connector Pin Assignment

*These signals may be reversed using the DTE\DCE switch
**These signals are connected together
***These signals are connected together

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

The Model 263 is equipped with a RJ-11 phone plug. Only four of the six positions are used as shown below.

7.0 Power

The Model 263 is powered via the TD input pin.

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 Hauppauge, 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. 0315-0150/Rev. A

Model	Product Info
263