Data Connect IG202T-R38 User Manual

DATA CONNECT ENTERPRISE

IG202T-R38 INDUSTRIAL GRADE MODEM

User Manual v1.3

http://www.dataconnectus.com

1. INTRODUCTION

1.1 Modem Overview

IG202T-R38 is a multistandard modem for asynchronous or transparent data transmission in
300-3400 Hz voice band. For lower baud rates it uses binary frequency modulation tech-
niques (FSK), which make it highly immune to interference and noise and permit extensive
voice-band communication link utilization. For higher baud rates it uses QAM modulations
with 4, 8 and 16 constelation points, depending of selected rate.

The modem supports CCITT V.29, R.38A, R.38B, R.37, R.35, V.23, BELL 103, BELL 202
proprietary

2400Bd and Cegelec 1200/600Bd communication standards. Table of
programmable channels (Figure 1.) depicts possible utilization of audio band in FSK mode. In
FSK mode the modem can operate in half or full-duplex, point-to-point or point-to-multipoint
mode, with receive and transmit channels independently set. For V.29 mode, four-wire full/half
duplex is default.

The modem employs advanced Texas Instruments 32-bit DSP technology, thus offering high
service flexib

ility through programmable features. Modem configuration is performed via
Hayes AT commands on separate DIAG serial port, available at front panel. AT commands
may be initiated from any asynchronous terminal application using RS-232 communication
interface. Additionally, for easy firmware upgrade, a bootstrap loader is provided using the
same DIAG serial port.

IG202T-R38 is designed to be use in SCADA systems mainly based upon power
utilityc

ommunication networks. Depending on selected mode, it can communicate

through specialized, private or leased lines, radio links and power lines (PLC).

Figure 1. Table of programmable channels in FSK mode

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1.2 Mounting Types

IG202T-R38 is available as a desktop modem or in two different types of standard 19'' rack:

 1U rack with 1, 2 or 3 modems

per rack;

 3U rack with 10,12 or 14

modems per rack,
and additional blank front plates covering unused slots.
All connectors at the rear side are accessible at the back openings.

2. INTERFACES

2.1 Front Panel

RST Reset button is accessible on the front panel using a pin of diameter under 2 mm (pencil

tip, etc.). It re-initialise all modem functions. The modem must be reset immediately
on inconsistent operation appearance, before starting the maintenance diagnosis phase.
This reset, like a long duration power cut-off, has no effect on the status of
configurations previously loaded into the modem.

SET Set button is used for entering command mode (see “Entering Command Mode”

section), which allows modem

configuration.

PWR In data mode PWR LED is ON when modem is power supplied and in proper function;

PWR LED is OFF in case of: power supply is not present or modem is in malfunction.
PWR LED blinks slowly (100ms / 1sec cycle) as an indication of command mode.
PWR LED blinks fast (100ms / 100ms cycle) when modem has locally initiated some
of the test modes. PWR LED blinks slowly (1sec / 1sec cycle) when modem is

remotely brought to some of the test modes.
TXD Transmit LED indicates data transmitted on TXD pin of RS-232 interface.
RTS Request to Send LED indicates state of RTS pin of RS-232 interface.
RXD Receive LED indicates data received on RXD pin of RS-232 interface.
DCD Data Carrier Detect LED indicates the presence of in-channel carrier with level higher

then predefined receive level.

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DCE

IG202T-R38

Figure 2. IG202T-R38 Front panel view (desktop version)

2.1.1 DIAG – Command/Bootloader serial interface

This connector is a RJ45 8 pin female type connector. It provides the interface between

the modem and terminal unit in command mode and in firmware upgrade process. The

following table gives the allocation and function of each pin.

PIN ABB. FUNCTION DIRECTION

DTE-DCE

1 SW - BSL Switch – Bootloader selection input x
2 GND Signal Ground ­3 CTS Clear To Send

←

4 RD Received Data

←

5 TD Transmitted Data

→

6 RTS Request To Send

→

7 SW - RUN Switch – Run selection input x
8 SW - COM Switch – selection output x

2.2.1 RS-232C / Data serial interface

This connector is a SUB D 9 pin female type connector with screw locking. It provides

the interface between the modem and remote terminal unit or data processing

equipment in data mode. The following table gives the allocation and function of each

pin.

PIN ABB. FUNCTION DIRECTION

DTE-DCE

1 DCD Data Carrier Detect

←

2 RD Received Data

←

3 TD Transmitted Data

→

4 DTR Data Terminal Ready

→

5 SG Signal Ground ­6 DSR Data Set Ready

←

7 RTS Request To Send

→

8 CTS Clear To Send

←

9 RI Ring Indicator

←

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2.2.2 Line / Analog interface

This connector is a SUB D 15 pin female type connector with screw locking, which

provides:

 Interface betw

een 2 or 4 wire analog line and the modem;

 The fail relay output

On the same connector modem has interface intended for communications management

with a radio interface (squelch and alternate) wh

ich are not supported in current

firmware version. Figure below depicts analog line interface.

Fi

g

ure 4. Analo

g

line interface

2.2.4 Power / Power Supply

Power supply connector is a 2-position screw plug type (for 2-2.5

2

mmwire) used for
connecting the modem to a DC power supply. Polarity is irrelevant. Maximum
consumption is 3VA. Table of possible voltage options are shown below.

Option Nominal

Voltage

(V)

Voltage

Range (V)

DC/DC converter

on board

IG202T-R38-12 12 9-18V SCW03A-05

IG202T-R38-24 24 18-36V SCW03B-05
IG202T-R38-48 48 36-72V SCW03C-05

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3. HARDWARE CONFIGURATION

Hardware configuration is performed directly on the modem board by positioning the jumpers
according to the the table below:

3.1 Jumpers placement (bold fase denotes factory default placement)

Feature Jumpers Option (ref. to AT&Mx command) Jumpers Placement

4-wire

JP400, JP403

2-3

2/4-wire analog
line

JP400,
JP403

2-wire (only in FSK/MUX1 or
FSK/MUX2 mode)

JP40

0, JP403 1-2

JP405, JP406

1-2

4-wire (FSK
and V.29 mode)

Z input 600Ω,
Z output 600Ω

JP401, JP402

2-3

JP405 1-2

4-wire (FSK/
MUX1 mode)

Z input 10kΩ
Z output 600Ω

JP401, JP402, JP406 2-3
JP402 1-2 Z input 600Ω,

Z output 10kΩ

JP401, JP405, JP406 2-3

4-wire (FSK/
MUX

2 mode)

Z input 10kΩ,
Z output 10kΩ

JP401, JP402, JP405,
JP406

2-3

JP405 1-2

2-wire (FSK/
MUX1 mode)

Z = 600Ω

JP401, JP402, JP406 2-3

Input & Output
Impedance

JP401,
JP402,
JP405,
JP406

2-wire (FSK/
M

UX

2 mode)

Z = 10kΩ

JP401, JP402, JP405,
JP406

2-3

Transmitter 3-state control off 1-2

Transmitter
3-state control

JP404

Transmitter 3-state control on

JP404

2-3

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Feature Jumpers Option

Jumpers Placement

JP407

ON

Proceed alternate radio relay signals
ALT1 and ALT2 to connector

JP409

ON

JP407 OFF

Alternate radio
relay signal
presence on
connector

JP407,
JP409

Do not proceed alternate radio relay
sign

als ALT1 and ALT2 to connector

JP409 OFF
JP411

ON

Proceed fail relay signals DEF1 and
DEF2 to connector

JP412

ON

JP411 OFF

Fail relay signal
presence on
connector

JP411,
JP412

Do not proceed fail relay signals DEF1
an

d DEF2

to connector

JP412 OFF
JP408

ON

Proceed the alternate squelch data
signals SQ+ and SQ- to connector

JP410

ON

JP408 OFF

Squelch data signal
presence on
connector

JP408,
JP410

Do not proceed squelch data signals
SQ

+ and

SQ- to connector

JP410 OFF

Enabled by switch on adapter cable 1-2

Bootstrap loader
operation

JP300

Enabled

JP300

2-3

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