UDS Motorola 202T - Modem
Telenetics MOT202T Modem

The UDS/Motorola Telenetics 202T modem is now " Born Again" as the Telenetics MOT202T modem. 
Now better with -40 to +85 C temperature range
now with VDC power modem and 220VAC 50Hz options

horizontal rule

(UDS Motorola 202T)
Telenetics MOT202T Modem
AC - DC power modem

 The Telenetics MOT202T Modem is a  0-1800 bps leased telecom line or private wire modem which is a pin-for-pin, form, fit and function replacement for the Motorola UDS 202T modem.  Telenetics recently signed a manufacturing license  with Motorola and we are now delivering this new product line. Telenetics had to change some of the older chips for newer analog filters which gives new life to a world class modem. With these new changes we can offer an even a better unit - now with wider voltage and  temperature range.

 Features such as built-in diagnostic, anti-streaming, multi-power inputs (115 to 240AC, 12 to 125VDC) and heat/cold rated operating range capabilities make this modem a must for industrial applications.

Telenetics has designed modems that work in "remote" remote sites with very low failure rates. These devices work where other modems roll over and die. When a service call to a remote site can mean an all day trip these modems are the ideal solution. 

To service the growing need for efficient, reliable data communications in the harsh environments of "remote" remote sites and industrial facilities. Telenetics has developed a family of data communications products that can operate from various AC & DC power supplies and survive high surge levels and extreme heat and cold. All this without compromising the performance expected from state-of-the-art communications devices.

The MOT202T is a direct replacement for the very popular 30-year-old (a defacto standard) design that Motorola acquired through the purchase of Universal Data Systems 

jump to Manual

horizontal rule

Specific Features

bullet2-wire half duplex or 4-wire full duplex private line operation 
bullet0 to1200 bps data rate over unconditioned lines 
and 1,800 over high quality lines
bulletPhase coherent, frequency shift keyed (FSK) modulation
bulletV.23 modulation
bulletV.24 and RS232 Data Port
bulletLED indicators
bulletFront panel rotary switch function selector
bulletIntegral test features
bulletTemperature rated -40 to +85 C
bullet12, 24, 48, 125VDC power
bullet115VAC, 60Hz - 220/240VAC 50Hz power

horizontal rule

The Telenetics MOT202T modem is a Frequency Shift Keyed (FSK) modem which is designed for asynchronous operation at 0 to 1800 bps with good line conditioning, or 0 to 1200 bps asynchronous operation on unconditioned lines. The modem provides half duplex communications on 2 wire private lines or full duplex communications on 4 wire private lines, and is ideal for use in multipoint networks.

The 202T modem is a single printed circuit card enclosed in a new compact size housing. The unit features an integral anti-streaming protection option which prevents network Tie-ups by incorporating a delay timer that will disconnect a modem, if it remains in transmit mode longer than a selectable period of time. The 202T also features strap options for Request to-Send/Clear to Send Delay timing, Transmit Carrier, local Copy Squelch, Turnaround squelch, Soft Carrier Turn Off, Carrier Detect Level, Carrier Detect Delay, and Test Generator Baud Rate Select. These strap options allow the user greater control of the modem, for his individual application.  

The Telenetics MOT 202T  modem features built-in diagnostic and anti-streaming capabilities. The anti-streaming capability prevents a modem from remaining in the transmit mode when the modem is not actively transmitting data. The diagnostic features allow the user to verify transmitted and received data. 

 The  modem is designed to be interchangeable between the Universal Data Shelf multiple modem enclosure (RM16M series) and the stand alone modem enclosure. By removing the modem card and attaching the optional front panel, the modem can be directly inserted into the Universal Data Shelf. With this feature, a data-communications facility can be easily upgrade front multiple standalone enclosures to a centralized rack without the expense and trouble of purchasing new modems. Telenetics had to change some of the older chips for newer analog filters which gives new life to a world class modem. With these new changes we can offer an even a better unit - now with wider voltage choices and a temperature range.


Data Rate: 0 up-to 1,800bps asynchronous 

Operation: Full duplex over 4 wire private lines or half  duplex over 2-wire private lines

Modulation: Phase coherent, frequency shift keyed (FSK)

Carrier Frequencies: Mark: 1200 Hz Space: 2200 Hz

Line Impedance: 600 ohms 10% transformer coupled and transient protected

Transmitter Output Level: Selectable from 0, to -12 dbm in 2 dbm steps

Clear to Send Delay: 8.3 ms, 33.2 ms, 59.9 ms, or 219.6 ms (selectable)

Carrier Detect Delay: 6 ms or 23 ms

Digital Interface: EIA RS-232 (DB-25 female) and CCITT V.24

Teleco Interface: RJ45 female

Turnaround Squelch: 0 ms, 8.3 ms, or 159.6 ms

Antistreaming: 4, 7.6, 14, 28, 56, none (selectable)

Soft Carrier Turnoff: 0 ms, 8.3 ms, or 26.6 ms

Environmental: -40 to +85 C; 95% humidity, noncondensing          

Mechanical: Width: 7"; Height 2.25"; Depth: 9.60"; Weight  3.0 Lbs.

AC Power Requirement:115 VAC and optional 
220/240VAC 50hz, @ 10 watts max

DC Power Requirements: 12 to 60 VDC, optional 125 VDC


Test Operate Switch

DL (Digital Loopback); When the switch is in the ST position, the received data is looped back into the transmitter and the data is transmitted to the remote end. The modem must be in the 4 wire mode.

TTP (Transmit Test Pattern): When the switch is in the TTP position, the transmitter is forced ON and transmits the date from the dot pattern generator to the COMM Line. The RS-232 interface lines to the transmitter are not active (RS, CS, TD).

DATA: The switch must be in the DATA position for all normal data transmission Indicators

RS (Request to Send): is illuminated when the RS line is high (ON)

CS (Clear to Send): ON when the CS line is high (ON)

CD (Carrier Detect): ON when a carrier is detected by the modem receiver.

RD (Receive Data): On when data is received, decoded, and furnished to the terminal equipment. RD is also ON when the receive cats line goes into a space condition, OFF in a mark condition.

TD (Transmit Data): Responds in the same manner as the RD LED, but only when data to be "transmitted" is furnished to the modem. However, the LED may be on when the DTE is disconnected.

TM (Test mode): Active when Test switch is in any test mode. The indicate' will blink OFF/ON when errors occur in Self Test mode

POWER: ON when power is applied




Stand Alone MOT202T    62025197


Rack Card MOT 202T     62025209


DC Powered MOT 202T   62025266

jump to Manual

You  may also want to consider pre-owned communications gear!
We also have new and used 202S, 202S/T 202S/D in used only




horizontal rule



Fax 301-924-7403

3405 Olandwood Court
Olney, MD 20832

e-mail experts@dceexpress.com