1.0 General Description

The Model 240, Universal RS-232 to V.35 Interface Converter, is a power stealing interface converter that will convert data, clock and control signals between RS-232 and V.35 equipment. The Model 240 will operate up to speeds of 100 KBPS and has the DataSpy LCD (patent pending) to help in installation and troubleshooting. The unit also incorporates a switch that allows the unit to interface to a DCE or DTE device.

1.1 DataSpy™ Feature
Your new Telebyte product incorporates the patent pending DataSpy feature, an LCD display designed to provide meaningful information to you, the user. It will assist in the initial installation and check out and thereafter 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 displayed on the LCD display indicates that the unit is powered (see Figure on following page). For power stealing devices such as your 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 as 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 (2) 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 is an indication of 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 presents to the user 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. The DataSpy LCD display will help verify correct operation.
 

2.0 Specifications

2.1 Interface : Conforms to EIA RS-232 and V.35 specifications.

2.2 Connectors
2.2.1 RS-232 : DB25F
2.2.2 V.35 : DB25F

2.3 Data Rate : 0 to 100Kbps

2.4 Switches : DTE/DCE switch

2.5 Transmission : Asynchronous or Synchronous

2.6 Indicators : The Model 240 is equipped with an LCD display for data, 5 control signals and power.

2.7 Power : None required - all power is derived from the RS-232 interface.

2.8 Size: 3.3"L x 2.86"W x .76"H (17mm x 11.25mm x 3mm)

2.9 Environment : 0° to 50° C, 5% to 95% relative humidity

3.0 Operation

The Model 240 incorporates a switch that allows the unit to interface a DTE or DCE device. When the switch is pulled out it is configured as a DCE and will connect to a RS-232 DTE device. When the switch is pushed in it is configured as a DTE and will connect to a RS-232 DCE device.

The Model 240 is supplied with a 10 foot extension cable, C25MM10, which can be used on either the RS-232 or V.35 port. See Section 7 for additional cable information.

V.35 interface signals include single ended and differential signals. All data and clock signals are differential while all control signals are single ended.

4.0 Troubleshooting

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

1. The data being received is garbled?
a) The DTE/DCE switch is not set properly (see Section 3).
b)The equipment that the Model 240 is connected to does not have the communication parameters set the same.
c) Data and clock signals on the V.35 side are reversed. If the LCD display is showing TD and/or RD as being constant high or streaming (see Section 1.1) then connections are reversed.

2. No data is being received.
a) Customer equipment not connected to the 240.
b) The DTE/DCE switches are not set properly (see section 3).
c) If operating in a synchronous mode then clock signals (Transmit Clock, Receive Clock, and Ext. Transmit Clock) must be supported.

5.0 Pin Number Assignments

The following table describes the pin number assignments for the RS-232 and V.35 interface. The direction shown is with respect to the RS-232 interface. An "I" indicates that the signal is an input to the converter on the RS-232 side and an output on the V.35. An "O" indicates that the signal is an output from the converter on the RS-232 side.

6.0 Power

The Model 240 derives all power from the RS-232 interface : data and one control is required for operation.

7.0 Accessories

Several accessories are available to vary the interface connectors. The CAB435 is a 6 foot (2 meter) cable that provides a V.35 interface on a 34 pin male M block V.35 connector. The CAB436 is the same except the gender of the V.35 connector is female. The Model 15-1 is a small adapter module that converts the DB-25 to a female, 34 pin M block connector.

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. 0315-0236/Rev. A