Raymar MIU202T User manual

0049-0101-XXX MIU202T – USER GUIDE 06/29/2018
Rev. B
Installation, Operation & Diagnostics
MIU202T
Industrial Grade, Bell 202T
Standalone Modem

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Rev. B Page i
Raymar Information Technology, Inc.
7325 Roseville Road
Sacramento, CA 95842
800-695-1951
Fax: [phone]

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The products and programs described in this User’s Guide are licensed products
of Raymar-Telenetics. This User’s Guide contains proprietary information
protected by copyright, and this User’s Guide and all accompanying hardware
and documentation are copyrighted.
Raymar-Telenetics does not warrant that the hardware will work properly in all
environments and applications, and makes no warranty and representation,
either implied or expressed, with respect to the quality, performance,
merchantability, or fitness for a particular purpose.
Information in this User’s Guide is subject to change without notice and does not
represent a commitment on the part of Raymar-Telenetics. Raymar-Telenetics
assumes no responsibility for any inaccuracies that may be contained in this
User’s Guide.
Raymar-Telenetics makes no commitment to update or keep current the
information in this User’s Guide, and reserves the right to make changes to this
User’s Guide and/or product without notice.
No part of this manual may be reproduced or transmitted in any form or by any
means, electronic or mechanical, including photocopying, recording, or
information storage and retrieval systems, for any purpose other than the
purchaser's personal use, without the express written permission of Raymar-
Telenetics.
 Copyright 2010 Raymar Information Technology, Inc.
7325 Roseville Road
Sacramento, California 95842
Tel: [phone] Direct: [phone]
Fax: [phone]
Web site: www.raymarinc.com

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TABLE of CONTENTS
1. STANDARDS 1
2. PRODUCT OVERVIEW 1
3. GENERAL PRODUCT SPECIFICATIONS 2
4. MODEM SPECIFICATIONS 2
5. ANALOG LINE SPECIFICATIONS 4
6. ANALOG MICROWAVE INTERFACE 5
7. POWER CONNECTIONS 6
8. SERIAL DATA PORT PIN-OUTS 7
9. DIP SWITCH FUNCTIONS 8
10. MODEM CONFIGURATION 10
11. LED INDICATOR 11
12. OUTLINE DRAWING & MOUNTING 12
13. DIAGNOSTICS 12

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1. STANDARDS
Meets FCC Rules Part J, Subpart 15, Class A for radiated emissions.
2. PRODUCT OVERVIEW
The MIU202T is an industrial grade Bell 202T modem for connection to unconditioned and
conditioned, voice grade, type 3002 two or four-wire leased lines and metallic lines (e.g.; pilot
wires). It can be powered from a wide range of AC and DC power supplies, it is internally surge
protected on both the power and analog lines, and it will operate in temperatures from -40 to
+85ºC.
Internally, the MIU202T consists of a baseboard and a communication module. The baseboard
includes the power supply regulation and surge protection. The communication module is a
Raymar-Telenetics Pony ExpressTM PE202T Modem Module.
The MIU202T is packaged specifically for the harsh environments found in utility substations
and industrial facilities. Though functionally similar to commercial modems, the MIU202T
includes special features that make it particularly well suited for utility and industrial
applications:
Environment: The MIU202T has been designed specifically for use in harsh
environments. In addition to an extended temperature range (-40 to
+85ºC), the MIU202T includes surge, shock, vibration, and safety features
superior to those of conventional commercial modems.
Power Supply: The MIU202T can be powered from a broad range of AC and DC power
supplies, such as an auxiliary supply (e.g.; 12 VDC) from another piece of
equipment, 125 VDC from a station battery or a standard 120VAC.
Industrial: The MIU is packaged in a rugged, compact, non-metallic (ABS) enclosure.
Designed for unmanned locations, the MIUs do not include the array of
pushbuttons and LEDs normally associated with consumer-type modems.
Configuration is by dip switches. Standard industrial connectors for data,
analog and power interfaces allow reliable interconnection to other
industrial components.

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3. GENERAL PRODUCT SPECIFICATIONS
Dimensions: 5.3 x 4.0 x 1.375 inches
Weight: 1 lb.
Voltage Supply:
Standard Model: 40 to 270 VDC
40 to 270 VAC, 50/60 Hz
LV Model: 9 to 36 VDC
Current Requirements:
12VDC 24VDC 125VDC 120VAC 220VAC
65mA 27mA 7.5mA 6.5mA 5.5mA
Surge Protection:
Power Supply: 8kVrms
Analog Line: 3.75kVAC
Digital Line: ESD ± 10kV
Operating Temperature: -40 to +85ºC
Operating Humidity: 0 to 90% (non-condensing)
Storage Temperature: -55 to 100ºC
4. MODEM SPECIFICATIONS
Modulation: Bell202T
Modulation Type: FSK
Synch/Async: Asynchronous Only
Data Rate: 0 – 1200bps
Transmit Frequency: Mark: 1200Hz
Space: 2200Hz
Error Correction: None
Data Compression: None

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Data Modulation Connectivity:
Using 16ms Polling Test
99.999% or better at -37dBm
99.5% or better at -40dBm
95% or better at -43dBm
Serial Format and Flow Control:
Asynchronous and RTS/CTS flow control
Analog Interface
Tx Output Level: -0dBm or -10dBm *
Rx Sensitivity: -43dBm or -33dBm *
-43dBm for constant carrier
-40dBm for polling carrier
Line Termination: Dip Switch Selectable *
Line Impedance: 600 ohms balanced
2 or 4 Wire Configuration: Dip Switch Selectable *
Other Features
Receiver Equalization: Compromise Equalization
Self-Test Diagnostics: None
Local Analog Loopback: See Section 13
Local Digital Loopback: See Section 13
Remote Analog Loopback: See Section 13
Remote Digital Loopback: See Section 13
Anti-Streaming: OFF or 45 Seconds (± 5 sec) *
RTS/CTS delay: 1ms, 12ms, 35ms or 50ms (± 5%) *
Note: Soft Carrier will affect RTS/CTS delay time
(see Dip Switch Settings – Section 8)
Constant Carrier: Switch Selectable ON or OFF

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Soft Carrier Turn Off 20ms of 900Hz after RTS is turned OFF
Carrier Turn ON/OFF 8ms ± 0.5ms
* Dip Switch Selectable – See Section 9
5. ANALOG LINE SPECIFICATIONS
The MIU202T contains analog circuitry for connection to the public conditioned or
unconditioned, Bell type 3002, 2 or 4-wire, full duplex voice grade leased lines or metallic lines
(e.g.; pilot wires). The MIU202T will also interface to Power Line Carrier or Microwave radio
voice channel networks.
The MIU202T has an RJ-11 terminated connector. The following lists the MIU202T analog
interfaces.
Analog Line Type:
Conditioned or unconditioned, Bell type 3002, 2 or 4-wire, full duplex voice grade or metallic
lines or better.
Analog Line Specifications:
Bandwidth 300 Hz to 3400 Hz (±3dB)
Impedance 600 / 900 ohms, balanced
Frequency Response 400 to 3000Hz (±2dB)
Receiver Input Level -16dBm max.
Output Level +7 dBm
Noise Signal Level -48 dBmO

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6. ANALOG MICROWAVE INTERFACE
The MIU202T is designed to interface to a Microwave radio voice channel network with the
following specifications:
Phase Jitter (10 to 300Hz) 1 degree peak-to-peak, max.
Frequency Response: 300 – 3400Hz -3, +0.7 dB
400 – 3000Hz -1, +0.7 dB
600 – 2400Hz ± 0.7 dB
Frequency Stability: With Synchronization 0.1 Hz
Without Synchronization 0.5 Hz/month
Level Stability (w/o regulation): ± 0.5 dB (6 months)
Harmonic Distortion: 1% max., 0.3% typical
(1 KHz, 0 dBmO test tone)
Absolute Delay: Option – 001: 1500 µsec, maximum
Option – 002: 1900 µsec, maximum
Group Delay (option – 001): 600 – 3200 Hz 1200 µsec, maximum
800 – 2800 Hz 550 µsec, maximum
1000 – 2600 Hz with 180 µsec, maximum
Linearity: 0.3 dB +3.5 dBmO
Limiting: +7.5 dBmO, max (+6.5 dBmO typical) for +20 dBmO input
Crosstalk (intelligible)(1 KHz test tone at 0 dBmO):
Inter-channel 65 dBmO maximum, 80 dBmO typical
Intra-channel 70 dBmO maximum
Crosstalk (unintelligible):
Adjacent channel 28 dBrnc0 maximum (24 455B weighted noise at 0 dBmO
dBrnc0 typical).
Intra-channel 28 dBrnc0, maximum (18 dBrnc0, typical)
(1KHz test tone at 0 dBmO)
Out of Band Signaling: Frequency 3825 Hz
Level -20 dBmO
Pulse distortion ±3 dB, level var. 3% max.
Signaling leak -60 dBmO, maximum

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7. POWER CONNECTIONS
Important Notes:
1. Wire colors shown are for optional Raymar-Telenetics cable, if ordered.
2. Customer supplies cable must be suitable for site environmental conditions.
3. Surge protection only guaranteed if ground wire >18 AWG
4. Solidly earthed ground connection required to guarantee surge protection.
5. Screw terminals accept 28 to 16 AWG.

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8. SERIAL DATA PORT PIN-OUTS

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9. DIP SWITCH FUNCTIONS
IMPORTANT NOTE: Invert modem to view dip switches as shown above.
Table 1
Switch Function ON OFF
Switch 1 Transmit Analog (TxA) Signal Level 0 dBm -10 dBm
Switch 2 Anti-Streaming 45 secs OFF
Switch 3 Received Analog (RxA) Signal Level -33 dBm -43 dBm
Switch 4 RTS/CTS Delay See Table 2
Switch 5 RTS/CTS Delay See Table 2
Switch 6 Switched/Constant Carrier Constant
Carrier
Switched
Carrier
(Follows RTS
State)
Switch 7 2 or 4- Wire Selection 2-Wire 4-Wire
Switch 8 Line Termination 600 ohms None
Switch 9 Soft Carrier (900 Hz) Turn Off ON OFF
Switch 10 Spare

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Table 2: RTS/CTS Delay Time
2
Wire
4
Wire
Switched
Carrier
Constant
Carrier
Switch
4
Switch
5
Switch 9
Soft
Carrier
RTS/CTS
Delay
Time
NO YES YES YES ON ON OFF 50 ms
YES NO YES NO ON ON ON 50 ms
NO YES YES NO ON ON ON 50 ms
YES NO YES NO ON ON OFF 50 ms
NO YES YES YES OFF ON OFF 35 ms
NO YES YES NO OFF ON ON 35 ms
YES NO YES NO OFF ON ON 35 ms
YES NO YES NO OFF ON OFF 35 ms
NO YES YES YES ON OFF OFF 12 ms
NO YES YES NO ON OFF ON 35 ms
YES NO YES NO ON OFF ON 12 ms
YES NO YES NO ON OFF OFF 12 ms
NO YES NO YES OFF OFF OFF 1 ms
NO YES YES NO OFF OFF OFF 12 ms
NO YES YES NO OFF OFF ON 1 ms
YES NO YES NO OFF OFF OFF 1 ms
YES NO YES NO OFF OFF ON 1 ms

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10. MODEM CONFIGURATION
The following table provides the Dip Switch settings required for most modem application
configurations:
Dip Switch Setting
1 2 3 4 5 6 7 8 9
4-Wire
Point-to-Point
ON ON ON ON
4-Wire
Multi-Point
Master
ON ON ON ON
4-Wire
Multi-Point
Slave Rx Term.
OFF
ON ON ON ON ON
4-Wire
Multi-Point
Slave Rx Term.
ON
ON ON ON ON ON ON
2-Wire
Point-to-Point
ON ON ON ON ON ON ON
2-Wire
Multi-Point
Master
Line Term. ON
ON ON ON ON ON ON ON
2-Wire
Multi-Point
Slave
Line Term. ON
ON ON ON ON ON ON ON
2-Wire
Multi-Point
Slave
Line Term.
OFF
ON ON ON ON ON ON
For clarity, a blank space = OFF

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11. LED INDICATOR

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12. OUTLINE DRAWING & MOUNTING
Note: Din Rail Mounting available – please call a Raymar-Telenetics sales associate for details.
13. DIAGNOSTICS
The following pages provide hardware techniques for diagnosing communication problems and
thereby isolating the problem at the local modem, the remote modem or the interconnecting line.
(a) LOCAL ANALOG LOOPBACK (Figure 2)
Requires a loop back cable with a built-in circuit for line loss to simulate a typical leased
line condition. (See Figure 3)
Connect the loop back cable to the RJ11 connector on the modem under test.
Set Dip Switches as follows:
Switch 7 = OFF 4-Wire
Switch 9 = ON Soft Carrier Turn Off Enabled
Switch 1 = ON Transmit (TxA) Signal Level = 0 dBm

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Switch 3 = ON Receive (RxA) Signal Level = -33 dBm
Switch 6 = OFF Switched Carrier
Switch 4 & 5 = ON RTS/CTS Delay = 50 ms
Test 1: RTS/CTS Analog Control
Set RTS “ON” and check that CD (Carrier Detect) turns “ON”.
Turn RTS “OFF” and ensure that CD turns “OFF”
With RTS “ON”, run a test message at TxD and verify that the same message is
received at RxD with no data errors.
Test 2: Transmit Signal Power & Receive Levels
Set Dip Switch 1 OFF (TxA = -10 dBm)
CD will be OFF
Change Dip Switch 1 to ON (TxA = 0 dBm)
CD should now be ON
Test 3: Received Signal Level
Set Dip Switch 1 OFF (TxA = -10 dBm) and Dip Switch 3 OFF (RxA = -43
dBm)
CD will be ON
Run a test message at TxD and verify that the same message is received at RxD
with no data errors.
Test 4:
Repeat Test 3 for various RTS/CTS delay times and with soft carrier ON and
OFF.
(b) LOCAL DIGITAL LOOPBACK – 4/Wire Network (Figure 4)
On the modem under test, connect TxD to RxD

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Switch 1 = ON (TxA = 0 dBm)
Switch 3 = ON (RxA = -33 dBm)
Switch 4 = OFF (RTS/CTS = 35 ms)
Switch 5 = ON (RTS/CTS = 35 ms)
Switch 6 = ON (Constant Carrier mode)
Switch 7 = OFF (4-Wire)
Switch 8 = ON (Line Termination = 600 ohms)
Switch 9 = ON (Soft Carrier = ON)
Transmit a test message from a remote modem and confirm that the same message is
received back at RxD on the remote modem with no data errors.
(c) REMOTE DIGITAL LOOPBACK – 4/Wire Network (Figure 5)
Configure both the local and remote modems as follows:
Switch 1 = ON (TxA = 0dBm)
Switch 3 = ON (RxA = -33dBm)
Switch 4 = OFF (RTS/CTS = 35 ms)
Switch 5 = ON (RTS/CTS = 35 ms)
Switch 6 = ON (Constant Carrier mode)
Switch 7 = OFF (4-wire)
Switch 8 = ON (Line Termination = 600 ohms)
Switch 9 = ON (Soft Carrier Turn Off = ON)
Connect TxD to RxD at the remote modem.
Transmit a test message from the local modem and confirm that the same message is
received back at RxD on the local modem with no data errors.
(d) LINE DIAGNOSTICS
(i) Typical modem configurations for 4-wire Point-to-Point system:
Switch 1 = ON (TxA = 0dBm)
Switch 3 = ON (RxA = -33dBm)
Switch 4 = OFF (RTS/CTS = 1 ms)
Switch 5 = OFF (RTS/CTS = 1 ms)
Switch 6 = ON (Constant Carrier mode)
Switch 7 = OFF (4-Wire)
Switch 8 = ON (Line Termination = 600 ohms)
Switch 9 = OFF (Soft Carrier = OFF)
(ii) Typical modem configuration for 4-wire Multi-Point system:

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Switch 1 = ON (TxA = 0dBm)
Switch 3 = ON (RxA = -33dBm)
Switch 4 = OFF (RTS/CTS = 1 ms)
Switch 5 = OFF (RTS/CTS = 1 ms)
Switch 6 = ON (Constant Carrier mode)
Switch 7 = OFF (4-Wire)
Switch 8 = ON (Line Termination = 600 ohms)
Switch 9 = OFF (Soft Carrier = OFF)
Adjustments:
In a network with high line loss (greater than 16dB) change Switch 3 (RxA) to OFF
(-43dBm).
If there are conditions that can cause cross-talk (TxA leaking into RxA path) set Switch 1
(TxA) to OFF (-10dBm).
Note that noise level should be -50dBm or lower for most FSK operation (signal-to-noise
ratio of 15dB or higher).

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