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Note: This manual may cover several products or versions of one product.
Other products or versions covered by this manual may still be active.

1.0 General Description

The Model 8365 is a unique interface converter that allows the user to operate RS-232 to RS-422 or RS-232 to RS-485. Furthermore, the RS-485 mode is selectable for two-wire or four-wire operation.

The Model 8365 comes equipped with a 5 position dip switch to set the operating mode and a DTE/DCE switch and is equipped with TD and RD LED's to verify operation.

2.0 Specifications

2.1 Interface: Conforms to EIA RS-232, RS-422 and RS-485 specifications.

2.2 Connectors: RS-232 = DB9 male; 422/RS-485 : 5 position terminal block.

2.3 Data Rate: 0 to 230 KBPS

2.4 Switches: DTE/DCE switch for reversing TD & RD. 5 position dip switch: set RS-485 to 2 or 4 wire, RS-422 and termination.

2.5 Indicators: TD and RD LED's

2.6 Power: 115VAC @ 60 Hz (220 VAC @ 50 Hz optional).

2.7 Size: 3" W x 4.5" L x .875" H (76.2mm x 114.3mm x 22.25mm)

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

3.0 Installation

The Model 8365 is designed to interface RS-232 with either RS-422 4 wire, RS-485 4 wire or RS-485 2 wire. In addition the RS-485 mode can be set to have its transmitter enabled by RTS or can be set to sense when data is being transmitted by the RS-232 device.

Note: In this mode the RS-485 driver is active for a transmitted "1" bit and in the high impedance state for the transmitted "0". This approach to RS-485 operation is compatible with most RS-485 systems.

The user also has the ability to enable a 220 Ohm terminator when the Model 8365 is configured in the 2 wire mode. To set the dip switches select the option from the following chart.

On = Closed
Off = Open

X = Enable(ON) / Disable(OFF) 220 Ohm Terminator

The 220 terminator should only be selected for use in RS-485 2 wire options. In addition to the requirements to set the 5 position dip switch the user must also determine if the Model 8365 will look like a DCE or a DTE device. When configured as a DCE the 8365 will connect to a DTE device such as a PC or terminal. When set as DTE the 8365 will connect to a DCE device such as a modem.

The Model 365 has built in protection to help prevent damage to the unit from surges. The surge suppression is connected internally to Frame Ground, pin 1, and Signal Ground, pin 7. This connection provides a path for the discharge of the surge. If the equipment does not support Frame Ground then the terminal marked G can be connected to an external earth ground connection.

4.0 Operation

4.1 RS-422
When the Model 8365 is configured as an RS-232 to RS-422 converter it will perform full duplex conversion of the TD and RD signals. The RS-422 equipment is connected to the 8365through the 5 position terminal block marked G, R-, R+, T-, and T+. The R+ and R- are the receiver inputs into the 8365and T+ and T- are the transmitter outputs. When connecting the 8365 to other RS-422 equipment, the T+ and T- should be one twisted pair while R+ and R- should be another. The G connection is connected to Pin 1, Frame Ground, on the RS-232 port.

4.2 RS-485
In the 4 wire mode the Model 8365has its receiver always ON and the transmitter can be controlled in one of two ways. The first is the transmitter can be enabled when the RTS (or CTS) is enabled or goes high. The second method is to turn the Transmitter ON when data is applied to the 8365from the RS-232 device. Connection to the 8365 is made to the terminal block with T+ and T- being the transmit pair and R+ and R- the receive pair. When operating in the 4 wire mode T+ and T- should be one twisted pair and R+ and R- an-other twisted pair.

The RS-485 two wire mode uses 1 twisted pair to transmit and receive. The 8365 will normally be in the receive mode or waiting for data from the RS-485 equipment. When the 8365wants to transmit it uses RTS or waits for data from the RS-232 to enable its transmitters, depending on the mode it is set for. The 8365uses the T+ and T- for its connections to the RS-485 device.

5.0 Troubleshooting

The following is a list of possible problems that may arise during the installation and solutions to these problems:

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 8365 is connected to does not have the communication parameters set the same.
c) T+ and T- are reversed going to R+ and R-. Look at the RD LED, if it is ON continuously then the leads are reversed.
d) One of the four wires is broken
e) Wires are not paired properly : T+ and T- should be one twisted pair and R+ and R- are the other pair.

2. No data is being received.
a) Customer equipment not connected to the 8365.
b) The DTE/DCE switches are not set properly (see section 3).
c) One or more wires between the modems are open.
d) Link connection exceeds maximum specified distance.
If the unit is believed to be defective, operation can be verified if one of the devices to which the modem is attached is capable of operating in a full duplex mode (such as a terminal or a PC using communications package such as Procomm). Connect the 8365 to the terminal through the RS-232 connector and make the following loopback connections at the analog interface.

T+ to R+ and T- to R-

If the modem is functioning correctly, any data entered on the keyboard should appear on the screen.

6.0 RS-232 Pin Number Assignments

* These signals can be reversed using the selector switch.
**, *** Connected together.

7.0 Power

The Model 8365 is powered by a small, wall mounted power supply that provides 12 VDC @ 500 mA. The power supply must be connected to the Model 8365, through the 1.3mm connector located on the side of the unit, before plugging the power supply into the wall.

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. 0315-0291/Rev. B