WTI Part No.: 12548
Rev. F
RMM
Rack Mount Data/Fax Modem
User's Guide
5 Sterling, Irvine, California 92618-2517
U.S. and Canada: 1-800-854-7226
Phone: (949) 586-9950
Fax: (949) 583-9514
http://www.wti.com
Table of Contents
1. Introduction●
2. Unit Description
2.1. Front Panel Indicators❍
●
3. Operation●
4. Installation
4.1. 48 Volt DC Power Option❍
4.2. Dip Switch Settings❍
●
5. Command Summary●
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6. S-Registers●
7. Specifications●
8. Customer Service●
List of Figures
1. Front Panel●
2. The Status Screen (Defaults Shown)●
3. 48 Volt DC Power Option●
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●
2. Unit Description
2.1. Front Panel Indicators
LED Status Meaning
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AA
(Auto Answer)
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.
CD
(Carrier Detect)
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).
RD
(Receive Data)
Flash
Modem is sending result codes or passing received
data bits.
SD
(Send Data)
Flash Computer is sending data bits.
TR
(Data Terminal
Ready)
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).
CS
(Clear to Send)
On
Hardware flow control is enabled (&H1, &H3),
modem is waiting for low CTS signal.
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.
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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)
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
Switch
Factory
Setting
Function
1 Data Terminal Ready (DTR) Override
X 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
X UP Verbal (Word) Results
DOWN Numeric Results
3 Result Code Display
UP Suppress Result Codes
X DOWN Display Result Codes
4 Command Mode Local Echo Suppression
X UP Enable Echo
DOWN Suppress Echo
5 Auto Answer Suppression
X 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
X 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).
X DOWN
Factory Defaults; Load &F0 (Generic) template
from read-only memory (ROM).
8 AT Command Set Recognition
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UP Dumb Mode: Disables command recognition
X DOWN Smart Mode: Enables command recognition
5. Command Summary
Type commands in either upper or lower case. Do not use a combination of upper and
lower case characters.
●
Use the Backspace key to delete errors. Note that the original AT command is stored
in the modem buffer, and cannot be deleted.
●
Some commands have numeric options. If these commands are invoked without a
numeric option, the modem will assume option 0 (zero). For example, when the
command ATB is invoked, the modem will assume command ATB0 was intended.
●
All commands begin with the AT prefix, and are invoked by pressing [Enter]
(Carriage Return). The only exceptions are the A/ command (Repeat previous
command) and +++ (Exit to on-line command mode).
●
The maximum command length is 40 characters. This does not include the AT prefix,
Carriage Returns, or spaces.
●
Note: Default values are marked with an asterisk. All defaults are based on the
&F1-Hardware Flow Control Template loaded in NVRAM.
Command Function/Options
$ Displays basic command list (On-line Help Menu).
A Manual Answer: goes off hook in answer mode. Pressing any key aborts the
operation.
A/ Re-executes the last issued command. Used mainly to redial. Does not require
the AT prefix or a Carriage Return.
Any Key Aborts off-hook dial/answer operation and hangs up.
AT Required prefix for all modem commands. Can also be used to test for the OK
result code. Not required for the A/ command or +++ command.
Bn U.S./ ITU-T answer sequence
* B0 ITU-T answer sequence
B1 U.S. answer tone
Dn Dials the specified phone number. Can also include the following command
options:
DL Re-dials last number dialed
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* DP Pulse (Rotary) Dial Mode
DR Originates call using answer (reverse) frequencies.
DSn Dials phone number string stored in NVRAM at position n (n = 0-3).
Phone numbers are stored with the &Zn=s command.
DT Tone Dial Mode
D, (Comma) Two Second Pause. Comma pause duration can be
redefined via the S8 Register.
D; (Semicolon) Return to Command Mode after dialing.
D" Dials the letters that follow (in an alphabetic number).
D! (Exclamation Point) Flashes the switch hook.
D/ Delays for 125 msec before proceeding with dial string.
DW Wait for second dial tone (X3 or higher). Linked to S6 Register.
D@ Dials, waits for 5 seconds of silence after detecting ringbacks, and
then continues (X2 or X4).
D$ Displays a list of dial commands.
En Sets local echo. (Also controlled by DIP Switch 4).
E0 Echo Off
* E1 Modem displays keyboard commands.
Fn Sets online local echo of transmitted data On/Off.
F0 Local echo ON. Modem sends a copy of data it sends to the remote
system to your screen.
* F1 Local echo OFF. Receiving system may send a remote echo of data it
receives.
Hn Controls On/Off Hook
H0 Hangs up (goes on hook)
H1 Goes off hook
In Displays the following information:
I0 Four-digit product code
I1 Results of ROM checksum
I2 Results of RAM checksum
I3 Product type
I4 Current modem settings
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