Western Telematic Data-FaxModem User Manual

WTI Part No.: 12548

Rev. F

RMM

Rack Mount Data/Fax Modem

User's Guide

5 Sterling · Irvine · California 92618-2517

[phone] · Toll Free: 1-800-854-7226
Fax: [phone] · http://www.wti.com

1. Introduction

The RMM Rack Mount Data/Fax Modem is designed for applications
that require a single “Industrial Strength” modem that easily installs in
equipment bays. The unit requires only 1 rack space, thus eliminating
the hassle of equipment trays and power bricks required for “Plastic
Box” modems.

Figure 1: Front Panel

The heart of the RMM is the popular and highly reliable U.S.
Robotics® Sportster® 28.8 modem card. The power supply is filtered,
fused and surge protected for operation in harsh environments. The
RMM is available in 115/230 (switchable) and 48 volt DC versions.

Features

Requires Only One 19 Inch Rack Unit.

·

High Speed ITU-T V.34+

·

Filtered and Surge Protected Power Supply.

·

115/220 Volt AC and 48 Volts DC Versions.

·

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RMM User’s Guide

2. Unit Description

2.1. Front Panel Indicators

LED Status Meaning

AA

(Auto Answer)

CD

(Carrier Detect)

RD

(Receive Data)

SD

(Send Data)

TR

(Data Terminal

Ready)

CS

(Clear to Send)

On Answer mode only: Modem is answering a call and

DIP Switch 5 is UP (Enable Auto Answer), or
register S0 is set to 1 (Auto Answer, 1 Ring).

Off No activity, or modem is originating a call.

Flash Incoming call.

On A valid data carrier signal has been received from a

remote modem, and Dip Switch 6 is UP (Normal
Carrier Detect). Modem is ready to transmit data.
The CD Indicator will remain ON constantly if Dip
Switch 6 is DOWN (Carrier Detect Override).

Flash Modem is sending result codes or passing received

data bits.

Flash Computer is sending data bits.

On Modem is receiving DTR signal from computer. The

TR indicator will only function when Dip Switch 1 is
UP (Normal DTR). Remains ON constantly if Dip
Switch 1 is DOWN (DTR Override).

On Hardware flow control is enabled (&H1, &H3),

modem is waiting for low CTS signal.

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3. Operation

The following commands can be used to display current configuration
status and various help menus:

View Modem Setup: ATI4
Basic Help Menu: AT$
Dial Command Help Menu: ATD$
Configuration Command Help Menu: AT&$
List of S-Registers: ATS$
Reset Modem to Default Profile 0: ATZ3

When the View Modem Setup command (ATI4) is invoked, the
RMM will display a status screen as shown below.

B0 E1 F1 M1 Q0 V1 X1 Y0
BAUD=9600 PARITY=N WORDLEN=8
DIAL=PULSE ON HOOK

&A1 &B0 &C1 &D2 &G0 &H0 &I0 &K1
&M4 &N0 &P0 &R1 &S0 &T5 &Y1

S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002
S07=060 S08=002 S09=006 S10=007 S11=070 S12=050 S13=000
S14=000 S15=000 S16=000 S17=000 S18=000 S19=000 S20=000
S21=010 S22=017 S23=019 S24=000 S25=005 S26=000 S27=000
S28=008 S29=020 S30=000 S31=000 S32=000 S33=000 S34=006
S35=000 S36=014 S37=000 S38=000 S44=015 S51=000

Figure 2: The Status Screen (Defaults Shown)

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RMM User’s Guide

4. Installation

4.1. 48 Volt DC Power Option

The 48 Volt DC input is not polarity sensitive. Therefore, you can
connect either positive or negative wires from your 48 volt power
source to either input and the internal circuitry will adjust for the proper
polarity.

Input Range: 40 - 60 Volts DC, 200 milliamps maximum.

Figure 3: 48 Volt DC Power Option

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4.2. Dip Switch Settings

Installation

Switch

Factory

Setting

Function

1 Data Terminal Ready (DTR) Override

l

UP Normal DTR operations: Computer must

provide DTR signal for modem to accept
commands. Dropping DTR terminates call.

DOWN DTR Override: Modem ignores DTR

2 Verbal/Numeric Result Codes

l UP Verbal (Word) Results

DOWN Numeric Results

3 Result Code Display

UP Suppress Result Codes

l DOWN Display Result Codes

4 Command Mode Local Echo Suppression

l UP Enable Echo

DOWN Suppress Echo

5 Auto Answer Suppression

l UP Auto Answer On: Modem answers on first

ring, or higher if specified in NVRAM

DOWN Auto Answer Off: Disable auto answer

6 Carrier Detect (CD) Override

l UP Normal: Modem sends CD signal when

connecting with another modem, drops CD on
disconnect

DOWN Override: CD always ON

7 Power-On and ATZ Reset Software Defaults

UP User Defaults: Load Y or Y1 configuration

from user-defined nonvolatile memory
(NVRAM).

l DOWN Factory Defaults; Load &F0 (Generic)

template from read-only memory (ROM).

8 AT Command Set Recognition

UP Dumb Mode: Disables command recognition

l DOWN Smart Mode: Enables command recognition

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RMM User’s Guide

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