RS-422/RS-485 To RS-232
The Model 285/365 Superverter is a unique interface converter that allows the user to operate in RS-232 to RS-422 or RS-232 to RS-485 mode. Furthermore, the RS-485 mode is selectable for two-wire or four-wire operation. The Model 285/365 comes equipped with a five-position dip switch to set the operating mode and a DTE/DCE switch. The Model 285 comes equipped with TD and RD LED's to verify operation while the Model 365 has the patent-pending DataSpy™ feature for installation and troubleshooting.
1.1 DataSpy™ Feature (Model 365 only)
Your new Telebyte product incorporates the patent-pending DataSpy™ feature, an LCD display designed to provide meaningful information to the user. It will assist in the initial installation and check out; thereafter it 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 shown on the LCD display indicates
the unit is powered. For power-stealing devices such as a 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.
If the transmit signal is in the quiescent state (continuously low) only the lower segments and the vertical bar will be illuminated. This indicates 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 shows 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. For most full-duplex data-only converters, CTS and RTS are connected together while DSR, DCD, and DTR are connected together. The DataSpy™ LCD display will help verify correct operation.
Conforms to EIA RS-232, RS-422 and RS-485 specifications.
2.2.1 Model 285 RS-232 : DB25M.
2.2.2 Model 365 RS-232 : DB25M or F (as ordered)
2.2.2 Both Models RS-422/RS-485 : Five-position terminal block.
2.3 Data Rate
2.3.1 Model 285 : 0 to 64 KBPS
2.3.2 Model 365 : 0 to 115 KBPS
DTE/DCE switch for reversing TD & RD. Five-position dip switch: set RS-485 to two or four wire, RS-422 and termination.
Model 285 : TD and RD LED's
Model 365 : Equipped with an LCD display for data, five control signals and power.
115VAC @ 60 Hz (220 VAC @ 50 Hz optional). See section 7.0, "Power," for more details.
Model 285 : 2.1" W x 4.6" L x 0.83" H (53.3mm x 116.8mm x 21.1mm)
Model 365 : 2.10" W x 4.17" L x 0.83" H (53.3mm x 105.9mm x 21.1mm)
0o to 50o C, 5% to 95% relative humidity.
The Model 285/365 is designed to interface RS-232
with RS-422 four-wire, RS-485 four-wire or RS-485 two-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. The
user also has the ability to enable a 220-Ohm terminator when the Model
285/365 is configured in the two-wire mode. To set the dip switches
select the option from the following chart.
X = Enable (ON) / Disable (OFF) 220-Ohm Terminator
In addition to setting the five-position dip switch, the user must also determine if the Model 285/365 will be configured as a DCE or a DTE device. When configured as a DCE device, the Model 285/365 will connect to a DTE device such as a PC or terminal. When set as DTE device, it 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.
RS-422: When the Model 285/365 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 Model 285/365 through the five-position terminal block marked "G," "R-," "R+," "T-," and "T+." R+ and R- identify the receiver inputs into the unit and T+ and T- identify the transmitter outputs. When connecting the unit 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.
RS-485: In the four-wire mode the Model
285/365 receiver is always ON and the transmitter can be controlled in
one of two ways. In the first method, 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 Model 285/365 from
the RS-232 device. Connection to the Model 285/365 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 four-wire mode, T+ and T- should be
one twisted pair and R+ and R- another twisted pair.
The RS-485 two-wire mode uses one twisted pair to transmit and receive. The Model 285/365 will normally be in the receive mode or waiting for data from the RS-485 equipment. When the unit wants 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 Model 285/365 uses the T+ and T- for its connections to the RS-485 device.
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.
2. No data is being received.
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 (e.g., a terminal or a PC using a communications package such as Procomm). Connect the Model 285/365 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.
7.1 Model 285
The Model 285 is powered by a small, wall-mounted transformer that supplies 9 VAC @ 500 mA. The transformer must be connected to the Model 285, through the 3.5mm connector located on the side of the unit, before plugging the transformer into the wall.
7.2 Model 365
The Model 365 is powered by a small, wall-mounted power supply that provides 12 VDC @ 500 mA. The power supply must be connected to the Model 365, through the 1.3mm connector located on the side of the unit, before plugging the power supply into the wall.
Note: Both of these units can be powered from +12 VDC on Pin 9 of the DB25 connector and Ground on Pin 7.
Assistance can be obtained by visiting our
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 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 (RMA) number is necessary. Assistance can be obtained by visiting our Technical Support Center.