Model 263M-290 - Non-Powered RS-232 to RS-422 Interface Converter
Reference Manual
1.0 General Description
The Model 263M-290 is an interface converter that allows users to link
RS-232 and RS-422 equipment. It is
hard wired as DTE on the RS-232 DB-25 connector and the RS-422 side is also a
DB-25 connector.
2.0 Specifications
Interface:
RS-232:
Pins 2 and 3 transmit and receive data; Pin 4 connected to Pin 5, Pins 20, 6 and
8 connected together; Pin 7 signal ground.
RS-422: T+ and T- Transmit
Data, R+ and R- Receive Data.
Connectors:
RS-232 - DB25M (male).
RS-422 -
DB-25F (female)
Data Rate:
0 to 19,200 BPS
Transmission: -
Asynchronous full duplex over 4 wires (2 twisted pair).
Power: Derived Power from interface. If any of the pins 4, 5, 6, 8 or 20
are high the 263 will take power from that pin. The energized pin must be at
least +5.0 volts.
If
there is no control signal then power is derived from the data input pin.
The data input pin must be at least -5.0V in the quiescent state with the
Model 263 connected.
Size: 2"W x 2.75"L x .75"H
Environment: 0° to 50° C, 5 to 95% RH (no condensation)
3.0 Installation
The Model 263M-290 is designed to interface RS-232 with RS-422 4 wire
devices. The RS-422 interface presents the transmit signals on pin 5 (TX+) and 3
(TX-). The receive signal pair appears on pins 4 (RX+) and 2 (RX-).
4.0 Operation
The Model 263M-290 is configured as a RS-232 to RS-422
interface converter and as such the unit will perform full duplex conversion of
the TD and RD signals. The RS-422
equipment gets connected to the unit through the female DB-25 connector on the
pins as called out above. The R+ and
R- are the receiver input into the Model 263M-290 and T+ and T- are the
transmitter outputs. When connecting
the unit to RS-422 equipment, the T+ and T- should be members of one twisted
pair while R+ and R- should be members of the other. When the RS-232 input
signal is - or marking the T- lead will be low and the T+ will be high. To
cause the RS-232 output signal to be - or marking the R- should be brought low
and the R+ should be high.
5.0 Troubleshooting
Operation can be verified if one of the devices to which the modems are attached
is capable of operating in a full duplex mode (such as terminal). Connect the
263M-290 to the terminal via the RS-232 connector and make the following
connections at the analog interface:
(Loopback)
T+ to R+ (pin 5 to
4) T- to R- (3 to 2)
If the modem is functioning any data
entered on the keyboard should appear on the screen.
6.0 Connector Pin Assignment
|
Pin
|
EIA
|
CCITT
|
Name
|
|
|
2
|
BA
|
103
|
Transmit Data
|
|
|
3
|
BB
|
104
|
Receive Data
|
|
|
4
|
CA
|
105
|
Request to Send
|
**
|
|
5
|
CB
|
106
|
Clear to Send
|
**
|
|
6
|
CC
|
107
|
Data Set Ready
|
***
|
|
7
|
AB
|
102
|
Signal Ground
|
Gnd
|
|
8
|
CF
|
109
|
Data Carrier Detect
|
***
|
|
20
|
CD
|
108.2
|
Data Terminal Ready
|
***
|
** Connected together *** Connected together
RS-422
|
R-
|
Receive -
|
2
|
|
R+
|
Receive +
|
4
|
|
T-
|
Transmit -
|
5
|
|
T+
|
Transmit +
|
3
|
7.0 Power
The Model 263 derives its power from any of the control signal pins 4, 5, 6, 8
or 20, or from the data input pin. For proper operation one of these pins must
be at lease -5.0 Volts in the quiescent state. This criteria is usually met by
the Transmit Data signal, which will appear on pin 3, TD input.
8.0 Help
If any assistance is required please visit 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 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 number (RMA) is necessary
and can be obtained by visiting our
Technical Support
Center. Reference RMA number on the outside container.
Document No. 0315-0160/Rev. A 03/22/2022
| Model |
Product
Info |
| 263M-290 |
 |
