RS-232 Optical Isolator
0315-0098 Rev. D
Table of Contents
The Model 268 Optical Isolator provides a complete full-duplex (including control signal) electrical isolation channel between two RS-232 devices. This isolation is an important consideration if a system uses different power sources, has noisy signals or must operate at different ground potentials.
Conforms to EIA RS-232D and CCITT V.24 specifications. Pins 2 and 3 (Transmit and Receive Data), Pins 4 and 5 (Request to Send and Clear to Send; Pin 20, Data Terminal Ready and Pin 8, Data Carrier Detect can be used instead of RTS and CTS by reconfiguring internal jumpers), Pin 7 (Signal Ground).
DTE = DB-25F, DCE = DB-25M
0 to 19,200 Bps
None required - derived from incoming data signals and control signals (must be at least _5 VDC).
2.25 in W x 6.76 in L x 1 in H
0 to +50o C , 5% to 95% RH (no condensation)
The Model 268 has been designed so that the user
need only connect their equipment to the proper DB-25 on
the Model 268. The male DB-25 connector is a DCE port
and connects to a DTE device, such as a terminal or PC.
The female DB-25 DTE port is connected to a DCE
interface, such as a dial-up modem. The direction of each signal
is shown in Figure 1.
The Model 268 has the option of reconfiguring which
control signal is used. DTR can be selected instead of RTS
and DCD instead of CTS. To reconfigure the unit remove
the four screws located on the top of the unit. The jumpers
are located near each DB-25, as shown in Figure 2, and
can be set according to the needs of your system. Once
the jumpers are set, replace the cover, making sure that
the end marked DCE is facing the male DB-25.
The Model 268 incorporates micro power
DC-to-DC converters that generate the necessary power for operation.
There are two sets of these circuits, one for each port,
that power the unit even if only TD, RD and ground
are connected. These lines should be at least _5 VDC in
the quiescent state with the Model 268 connected.
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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. 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 and can be obtained by visiting our Technical Support Center. Reference the RMA number on the