2.0 GENERAL INFORMATION
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is
warranted for One Year parts and labor. If any questions or problems
arise during installation or use of this product, please do not hesitate to
contact Patton Electronics Technical Support at 301-975-1000.
2.1 FEATURES
• Bi-directionally converts synchronous RS-232 to X.21
• Data rates to 384 Kbps, full or half duplex
• Transparent to protocol
• No AC power or batteries required
• DB-25 and DB-15 connectors with integral 6 foot cable
• Circuitry housed in ultra-miniature case
• Made in the USA
2.2 DESCRIPTION
The Model 2021 RS-232 to X.21 converter
lets a synchronous
RS-232 device communicate bi-directionally with a synchronous X.21
device. The Model 2021 requires no AC power or batteries to operate
and supports data rates to 384 Kbps. Operating full or half duplex, the
Model 2021 passes all necessary clocking and control signals, and is
transparent to protocol.
The Patton Model 2021 connects directly to the synchronous
RS-232 interface using a male or female DB-25 connector. A male or
female DB-15 connector at the end of an integral 6 foot cable plugs into
the X.21 interface. In most cases, this eliminates the need for special
crossover cables. Housed in an ultra-minature case measuring only
3.56”L x 2.10”W x 0.80” H, the Model 2021 fits easily into tight
locations. The Model 2021 is manufactured by Patton Electronics in
the USA.
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3.0 INSTALLATION
The Model 2021 is designed to be easy to use. Since there is
nothing to configure, all you need to do is plug the Model 2021 into the
proper device ports.
Figure 1 below illustrates proper connection of an RS-232 DTE to
an X.21 DCE using the Model 2021xC-xT.
To connect an RS-232 DCE to an X.21 DTE, use the Model
2021xT-xC, as shown in Figure 2.
X.21 Host (DTE)
RS-232 Sync Modem (DCE)
Figure 1
. Sync Terminal connected to X.21 Modem using Model 2021XC-XT
Figure 2
. RS-232 Sync Modem connected to X.21 Host using Model 2021XT-XC
X.21 Modem (DCE)
Sync. Terminal (DTE)
