2.0 GENERAL INFORMATION
Thank you for purchasing this Patton Electronics product. It has
been designed, manufactured and tested to give you years of trouble-
free service. If any questions or problems arise during use, please do
not hesitate to call Patton Technical Support at (301) 975-1007.
2.1 FEATURES
• Multiplexes two RS-232 devices into one RS-232 modem link
• Asynchronous sub-channel rates: 110, 300, 1200, 2400, 9600,
19,200 and 38,400 bps
• Asynchronous main channel rates: 1200, 2400, 9600,
19,200 and 38,400 bps and auto detect
• Interface powered–no AC power or batteries required
• Miniature design–plugs directly into DB-25 modem port
• Modular RJ-45 sub-channel ports 1 & 2
• Convenient configuration using extended AT command set
• Configure local and remote units from either local port 1 or 2
• Supports both XON/XOFF and RTS/CTS flow control
2.2 DESCRIPTION
The Patton Model 3022 MicroStat II is a miniature statistical
multiplexer that lets one asynchronous modem communicate with two
asynchronous serial devices
at the same time. Operating at data rates
up to 38.4 Kbps, the Model 3022 uses specialized circuitry to monitor
and prioritize data flow. The Model 3022 can be configured so that
upon startup it automatically senses the data rate of the device
connected to either sub-channel. It can also be configured to go into
Data Mode when the modem raises CD. For added convenience, the
Model 3022 allows both local and remote multiplexers to be configured
from local port 1 or 2.
The Model 3022 supports both hardware (RTS/CTS) and software
(X-ON/X-OFF) flow control. Connecting directly to the modem’s DB-25
port, the Model 3022 derives power from the RS-232 interface and
requires no AC power or batteries for operation. Async input devices
connect to the Model 3022 using dual RJ-45 modular interface jacks.
The Model 3022 is housed in a sturdy ABS plastic case measuring
2.66"w x 2.10"l x 0.73"h.
3.0 INSTALLATION
The Model 3022 is typically installed by connecting the main
channel to an asynchronous modem and the sub-channels to two
asynchronous serial devices. However, two Model 3022s may also be
connected back-to-back. This section describes connection
procedures, as well as LED indicator function, power requirements,
and flow control requirements.
3.1 CONNECTING THE MAIN CHANNEL
To use both channels of your Model 3022, you must be linked to
another Model 3022, which is usually located remotely and
interconnected with a pair of modems. On one end of the Model 3022,
you will find the asynchronous RS-232 Modem interface. This is a
DB-25 male connector, which plugs directly into the DB-25 female
connector on your modem. The following table lists the pin
connections on the Model 3022's modem interface:
Pin#
Description
Direction
1
Protective Ground
N/A
2
Transmit Data
From Model 3022
3
Receive Data
To Model 3022
4
Request to Send
From Model 3022
5
Clear to Send
To Model 3022
6
Data Set Ready
To Model 3022
7
Signal Ground (common return)
N/A
8
Carrier Detect
To Model 3022
9
9 to 12 Volt Power (optional)
To Model 3022
20
Data Terminal Ready
From Model 3022
22
Ring Indicator
To Model 3022
If your application requires an RS-232 cable between the Model
3022 and the modem, it must be a
straight-through cable (pinned 1-1,
2-2, 3–3, etc.) of the
shortest possible length.
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