1.0 General Description

Product Description

Since the unit to be interfaced may look like a computer or a terminal, the device required to couple different systems together requires the facility of functioning as a DCE (Data Communications Equipment) or DTE (Data Terminal Equipment). Because of this the converter is offered as a 63-3 or the 63-4. The Model 63-3 is equipped with the RS-232 Interface that is designed to couple to a modem. Therefore, the RS-422 port of the Model 63-3 will interface with a terminal device which has a RS-422 interface. Similarly, the Model 63-4 is used where RS-232 port is required to interface to the terminal.

1.1 RS-422 Description

The RS-422 specification as generated by the Electronic Industries Association provides for a balanced voltage digital interface that is used for interchange of serial binary signals between DTE and DCE equipment in any point to point interconnection. The balanced voltage interface uses a differential driver and receiver technique. Thus, two wire are required for each signal. The specification provides for data signaling rates of up to 10 megabaud using twisted pairs. Operation is allowed at 100,000 bits per second up to 1,200 meters and one megabaud per second up to 100 meters.

The design of the 63-3 and 63-4 is such that the use of a one-to-one corresponding cable between a -3 and -4 on the RS-422 interface port will provide a high speed Short Haul Modem link. Thus, data can be transmitted to a 100 KHz rate over distances of 4,000 feet. See Figure 1.

2.0 Specifications

2.1 Common

INTERFACE

Conforms to EIA RS-232 for RS-232 port and modified EIA RS-422 spec for the RS-422 port. The following two tables describe in detail the input output connections for each device.

In the case of the 422 connections, two pin numbers are designated separate by a slash. The pin to the left of the slash is considered positive with respect to the pin to the right of the slash.

Connectors: RS-232=25 pin male. RS-422=25 pin female; both connectors DB type.
Data Rate: 256 KBPS
Transmission: Differential voltage in compliance with EIA RS-422.
Power: Self Powered - 110 volts AC, 50/60 HZ, 20 VA. Host Powered - +12 volts DC @ 125 ma., -12 volts DC @ 25 ma.
Size: 4"L X 2.2"w X 1"H, Plus wall mounted transformer for self powered versions.
Environment: 0° to 50°C, 0% to 95% RH.

NOTE: On the Model 63-4 Pin 13 of the RS-422 connector is Signal Ground.

2.2 Power

The Model 63-3/4 Converters are available in both Host Powered and Self Powered configurations. The Self Powered configuration, designated by an "S" after the model number, is supplied with a wall mounted transformer which produces a low voltage AC that is cabled to the device. Internally, this low voltage AC is converted to +/- 12 volts and +5. The Host Powered version designated by an "H" after the model number required that the user supply +12 and -12 volts on pins 9 and 10 respectively of the RS-232 connector. Internally, the +5 is then derived from the +12 volts.

2.2.1

Host Powered: +12 volts DC @ 125 ma -12 volts @ 25 ma.

2.2.2

Self Powered: 110 volts AC, 50/60 HZ 20 VA.

3.0 Installation

3.1 Converters

The following two diagrams show the interconnection for the 63-3 and 63-4 when used as converters.

3.2 Modem Operation

The following diagram shows the implementation of a Full Duplex Short Haul Modem link utilizing a 6.3 and 63.4.

4.0 Operation

Each converter provides for signals in each direction. These signals are processed simultaneously. It is not necessary to use all 8 signals. The unused signals can be left floating.

5.0 Trouble Shooting

Individual converter verification can be accomplished by performing a loop back. Typical loop back for a 63-4 connected to a CRT Terminal is shown in the following figure. With a CRT operating in the full duplex mode any data entered on the keyboard will not be displayed until it is received back at its input port. If the converter is functioning properly, the data entered on the keyboard will appear on the screen. This procedure can be used to test a portion of the converter or the entire converter as shown.

6.0 Connector Pin Assignments

Exact connector pin assignments have been shown in detail in the Specification section of this manual.

7.0 Power

7.1 Host Powered

Power must be supplied to these units through pins 9 and 10 of the RS-232 connector. The voltage may be in the range of 11-13 volts positive on pin 9 and in the range of 11-13 volts negative on pin 10. The absolute difference between the + and - volts should not exceed ½ volt. The positive supply should be capable of delivering 125 ma., whereas the negative supply must be capable of delivering 25 ma.

The power inputs are diode protected to prevent damage from any inadvertent application of improper polarity voltages on pins 9 and 10.

7.2 Self Powered

Operating power is generated on the combination of the wall mounted transformer and regulation circuitry internally to the converter. The transformer plugs into a 120 volt AC receptacle. A multi conductor 8 foot line cord delivers low voltage AC to the converter. The internal rectifier circuits develop +/- 12 volts DC and +5 volts DC.

The transformer delivers 23 volts AC, is center-tapped and has a power capability of 20 va. For applications using input voltages other than 120 vac., the user must supply his own transformer.

8.0 Help

Assistance can be obtained by visiting our Technical Support Center.

9.0 Block Diagrams

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. 0315-0026/Rev. B