Epson ESC/VP21 User manual

FAX/DATA MODEM
USER’S MANUAL

Notice:
Hayes is a trademark of Microcomputer Products Inc.
Publication Number : ASK9406

Table of Contents
FCC/DOC REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . .
i
FCC General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
FCC Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
DOC Notice . . . . . . . . . . . . . . . . . . . . . . . . ..III
INTRODUCTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
COMMAND REFERENCE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
General Command information . . . . . . . . . . . . . . . . . . . . . . ...4
AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...4
Commands Preceded by & . . . . . . . . . . . . . . . . . . . . . 11
Commands Preceded by \ . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Commands Preceded by % . . . . . . . . . . . . . . . . . ...23
Commands Preceded by-and ” . . . . . . . . . . . . . . . . ...25
Dial Modifers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Time Independent Escape Sequence (TIES) . . . . . . . . . . . ...29
Result Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..31
S REGISTER REFERENCE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35
Register Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Glossary of the S Registers . . . . . . . . . . . . . . . . . . . 38

TESTING
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53
Local Analog Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Local Analog Loopback with Self-Test . . .. . . . . . . . . . . . . 56
Remote Digital Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Remote Digital Loopback with Self-Test . . .. . . . . . . . . . . 59
Local Digital Loopback . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . 60
Grant or Deny RDL Request from Remote Modem . . . . . 62
TROUBLESHOOTING GUIDE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
63
APPLICATION EXAMPLES . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .
67
Dialing a Remote Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Dial a Stored Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Manual Answer an Incoming Call . . .. . . . . . . . . . . . . . . 68
Auto Answer an Incoming Call . . . . . . . . . . . . . . . . . . . . . . . . . 68
Voice to Data Switching . . . . . . . . . . . . . . . . . . . . . . . . 69
TECHNICAL SPECIFICATIONS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
71
Features . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
QUICK REFERENCE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
75
ASCII CODE TABLE
. . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
79

i - FCC/DOC REQUIREMENTS
i.1 FCC General Information
The Federal Communications Commission (FCC) of the United States restricts
specific uses of modems, and places registration responsibilities on both the manu-
facturer and the individual user:
1.
2.
3.
i.2
The modem may not be connected to a party line or to a coin operated tele-
phone,
The modem manufacturer must make any repairs to the modem to maintain
valid FCC registration.
Notification to the telephone company is no longer required prior to connect-
ing registered equipment, but upon request from the telephone company, the
user shall tell the telephone company which line the equipment is connected
to as well as the registration number and ringer equivalence number of the
registered protective circuitry FCC information is printed on a label on the
bottom of the modem.
FCC Notice
This equipment has been tested and found to comply with the limits for a digital de-
vice, pursuant to Subpart B of Part 15 of the FCC rules. These limits are designed
to provide reasonable protection against harmful interference in a residential instal-
lation. This equipment generates and uses radio frequency energy and if not in-
i - FCC/DOC REQUIREMENTS
I

stalled and used the instructions. may cause interference to radio communications.
However, there is no guarantee that interference will not occur in a particular instal-
lation, If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user
is encouraged to try and correct the interference by one or more of the following
measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a curcuit different from that to
which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
Shielded interconnect cables and a shielded power cord must be employed with
this equipment to insure compliance with the pertinent RF emission limits
governing this device. Changes or modifications not expressly approved by the
manufacturer could void the user’s authority to operate this equipment.
NOTE : The manufacturer is not responsible for any radio or T.V. in-
terference caused by unauthorized modifications to this eq-
uipment. Such modifications could void the user’s authority
to operate the equipment.
ii
FCC/DOC REQUIREMENTS - i

i.3 DOC Notice
Notice: The Canadian Department of Communications label identifies certified
equipment. This certification means that the equipment meets certain telecommuni-
cations network protective, operational and safety requirements. The Department
does not guarantee the equipment will operate to the user’s satisfaction.
Before installing this equipment, users should ensure that it is permissible to be
connected to the facilities of the local telecommunications company. The equip-
ment must also be installed using an acceptable method of connection, In some
cases, the company’s inside wiring associated with a single line individual service
may be extended by means of a certified connector assembly (telephone extension
cord). The customer should be aware that compliance with the above conditions
may not prevent degradation of service in some situations.
Repairs to certified equipment should be made by an authorized Canadian mainte-
nance facility designated by the supplier. Any repairs or alterations made by the
user to this equipment, or equipment malfunctions. may give the telecommunica-
tions company cause to request the user to disconnect the equipment.
Users should ensure for their own protection that the electrical ground connections
of the power utility, telephone lines and internal metallic water pipe System if pre-
sent, are connected together. This precaution may be particularly important in rural
areas,
i - FCC/DOC REQUIREMENTS
Ill

Caution: Users should not attempt to make such connections themselves, but
should contact the appropriate electric inspection authority. or electrician, as appro-
priate.
The Load Number (LN) assigned to each terminal device denotes the percentage
or the total load to be connected to a telephone loop which is used by the device, to
prevent overloading. The termination on a loop may” consist of any combination of
devices subject only to the requirement that the total of the Load Numbers of all the
devices does not exceed 100.
iv
FCC/DOC REQUIREMENTS - i

1- INTRODUCTION
Congratulations on your purchase of this outstanding Fax/Data Modem. This man-
ual describes how to operate your new Fax/Data Modem.
Instructions for installing your Fax/Data Modem will be found in the Installation
Manual, while the information in this manual, deals exclusively with the operation
of the modem
after it is installed, such as the command set, the internal configura-
tion registers, troubleshooting and testing.
Features :
These Fax/Data Modems combine the features of a 14400 bps data modem and a
14400 bps FAX modem. Your new Fax/Data Modem gives your personal compu-
ter the ability to send and receive FAX messages over the telephone line like a
standard FAX machine. Your Fax/Data Modem also allows your PC to communi-
cate with other personal computers, terminals or BBS’s (Bulletin Board Systems)
through the data modem functions,
When used as a data modem your Fax/Data Modem uses the standard AT command
set and is fully compatible with CCITT V.42, V.42bis, V.32bis, V.32, V.22bis,
V.22, V.21, MNP 2-5, Bell 103 and 212A. When used as a Fax/Data Modem it
communicates with all CCITT Group 3 FAX machines and is compatible with
CCIIT V.27ter and V.29, V 17, T.4 and T,30. Switching between DATA mode op-
eration and FAX mode operation of your Fax/Data Modem is done through its
firmware, no hardware settings are required.
1- INTRODUCTION 1

If you are already familiar with the use of a modem and the Hayes AT command
set, this modem will be extremely easy for you to use. Just read the installation pro-
cedures in the installation manual and you are ready to begin operation. If you are
new to modem communications, we recommend that you read through this manual
first. If you come across terms that you don’t understand. consult the glossary.
Words in
boldface type are command names, commands. or default settings. Car-
nage returns (Enter) are noted with <CR> or [ENTER]; this does not mean to enter
these characters literally; but instead to press the Enter key.
This manual is written to be used for several models of Fax/Data Modems. Some
of the information in this manual may not apply to your fax/data modem.
2
INTRODUCTION -1

2- COMMAND REFERENCE
This chapter provides an alphabetized reference with examples for all commands
for the modem. The system of commands is depicted below in Figure 2-1.
To use these commands for dialing or configuring the modem, make sure the
communications software package you will be using lets you operate the modem
through its internal commands. If your software permits use of the modem’s inter-
nal commands, read this chapter. If not, read your software user’s manual and
ignore the rest of this manual.
Fig. 2-1
System of Commands
2- COMMAND REFERENCE
3

2.1 General Command Information
Except for the A/ command and the TIES escape sequence described in Section 2.4,
all commands must be prefixed with the attention code AT. For instance, the A
command (below) would be entered as:
“AT A <CR>”. Without the AT prefix,
the command line cannot be executed. Once entered, AT cannot be deleted with
the Backspace or Delete keys.
More than one command can be placed on a single line and, if desired, separated
with spaces for readability. Once the carriage return
(Enter) key is pressed, the
command line is executed. Aline with no carriage return is ignored.
The modem accepts either upper or lower case characters in the command line and
ignores any spaces within or between commands. Typing errors can be corrected
with the Backspace key. Exceptions are noted in the description of specific com-
mands.
A command without any parameter is eqivant to that the parameter 0 is being used,
for example, the command line ATL is equal to ATL0.
2.2 AT Commands
A/ Repeat Last Command
This command re-executes the last ‘AT’ command string stored in the command
4 COMMAND REFERENCE - 2

buffer. The A/ command is the only command not preceded by ‘AT’ and ended by
a carriage return.
A
Go On-line in Answer Mode
This command instincts the modem to go off-hook immediately and then make
a handshake with the remote modem. Handshaking is not available during leased
line operation. This command is useful for manually answering a call or estab-
lishing a back-to-back connection with an originate mode modem.
Bn Select Protocol to 300 bps or 1200 bps
B0 Selects CC ITT 300 or CC ITT 1200 protocol
once the command line prefix AT has been
entered at the 300 bps or 1200 bps data rate,
B1
Selects BELL 300 or BELL212A protocol once
the command line prefix AT has been entered
at the 300 or 1200 bps data rate. (default)
Cn
Carrier Transmit Control
Controls the transmit carrier. The modem is preset to turn carrier on and off as nec-
essary (the C1 option). The signal is on when the modem is calling, or connected to
a remote modem, and is off when it is not. The CO option is NOT valid.
C0
Not permitted; returns ERROR result code
C1
Normal transmit carrier switching. (default)
2 - COMMAND REFERENCE
5

D
Go On-line in Originate Mode
D instructs the modem to go off-hook immediately and automatically dial the num-
ber contained
in the dial string following D. The dial string may contain any of the
dial modifiers contained in the following section. The D command without a dial
string is usually used to switch from voice conversation to data communication or
to call a remote modem in leased-line operation mode. During this kind of opera-
tion. the dial tone monitor should be disabled with the X0, X1, or X3 commands.
En
Command Echo
E0 Disables command echo.
El Enables command echo. (default)
Fn
On-line Echo
This command is normally used to select whether the modem echoes data back to
the host during on-line data mode. This device set does not support on-line data
mode echo,
F0
Echo enabled. (returns an error message)
F1
Echo disabled. (default)
Hn Hang Up
HO
Goes on-hook. (hangs up)
H1 Goes off-hook. (ready to dial)
6 COMMAND REFERENCE - 2

In Identification/Checksum Option
This command causes the modem to send product code and hardware setup informa-
tion to the DTE.
I0
Report product code. (default)
I1 Firmware version #.
I2
Verify ROM checksum.
I3 Device set name.
I4
Modem configuration.
Bit 0 0= Hayes Escape Sequence.
1 =TIES Escape Sequence,
Bit 1 0= Data/fax/voice without V.42/MNP firmware.
1 =Data/fax/voice with V.42/MN P firmware.
Bit 2 0= Serial host interface,
1 =Parallel host interface.
Bit 3 0=No external Static RAM present.
1 =External Static RAM present,
Bit 4 0=8K x 8 static RAM present. (valid only if bit 3 = 1 )
1 =32K x 8 static RAM present. (valid only if bit 3 = 1)
Bits 5-7 Reserved
Kn
Buffer Control
This command selects whether the modem SRAM is used for voice and fax mode,
K0
SRAM buffer disabled. (default when no SRAM is available)
K1 SRAM buffer enabled. (default when the SRAM is available
on modem board) (default)
2 - COMMAND REFERENCE
7

Ln
Control Speaker Volume
L0 Low volume.
L1 Low volume.
L2 Medium volume. (default)
L3 High speaker volume.
Mn
Monitor Speaker On/Off
M0 Speaker is always off.
M1 Speaker is off while receiving carrier. (default)
M2 Speaker is always on.
M3
Speaker disabled while dialing or receiving carrier
Nn Select Data Rate Handshake
This command specifies whether the resulting modem-to-modem data rate can be
different than the local DTE-to-modem data rate.
N0 When originating or answering, handshake only at
the DTE-to-modem data rate.
N1 When originating or answering, begin handshaking
at the DTE-to-modem data rate. If the remote modem
does not support the local DTE-to-modem data rate.
fall down to the highest compatible data rate. (default)
8
COMMAND REFERENCE - 2

On Return to the On-line State
Applies to asynchronous operation only. If the user enters the command mode from
the data mode by issuing the escape sequence, or as a result of ON-to-OFF transi-
tion of DTR with the AT&D1 option in effect, the user may return to the data mode
without terminating a call by issuing the ATO command.
O0
Causes the modem to return to the data mode. (default)
O1
Enters on-line data mode with a retrain before returning
to on-line data mode.
P Set Pulse Dial as Default
Causes the modem to assume that all subsequent dial commands are pulse dialed.
You may omit the “P’ from the dial strings.
Q
Result Code Display
Determines whether the modem sends the result codes to the DTE.
Q0 Allows the modem to send result codes to the
DTE. (default)
Q1
Prohibits the modem from sending result codes
to the DTE.
2 - COMMAND REFERENCE
9

Sn
T
Reading and Writing to S Registers
Sn?
Reads S Registers:
Reads the contents of the S register specified by ‘n’.
Sn=x Writing to Registers:
Writes the value of x to the specified S register. All
the registers will return the OK response if x is a legal
value. (n= 0-30, x=0-255)
Set Tone Dial as Default
Causes the modem to assume that all subsequent dial commands are tone dial.
Vn Select Word or Digit Result Codes
V0
Displays. result codes in digital format.
VIDisplays result codes in verbose format. (default)
Xn
Select Result Codes
X0
X1 X2 X3 X4(default)
Connect Message Partial
Full Full Full Full
Dialtone Monitor Off Off
On
Off On
Busy Tone Monitor
Off Off Off
On On
10
COMMAND REFERENCE - 2

The partial connect message reports CONNECT, the full message reports CON-
NECT XXXX, where XXXX is the data rate.
Yn
Enables or Disables Long Space Disconnect
Y0 Disables Long Space Disconnect.
Y1 Enables Long Space Disconnect. (default)
Zn Reset
Zn, which must be placed at the end of the command line, resets the active configu-
ration of the modem to the stored configuration saved in nonvolatile RAM, hanngs
up the modem. and clears the command buffer.
Z0 Resets the modem and loads stored
configuration 0. (default)
Z1 Resets the modem and loads stored
configuration 1.
2.2.a Commands Preceded by &
&Cn Select DCD Options
&C0 Maintains an ON status for the Data Carrier
Detect. (DCD)
&C1
Uses the actual state of the carrier from the
remote modem for DCD. (default)
2 - COMMAND REFERENCE
11

&Dn DTR Option
This command controls how the modem responds to DTR, After toggling DTR,
the host should wait 200 ms before modifying the UART registers or sending a
new command to the modem as the modem does not send an ‘OK’ message to
indicate it has performed the requested function.
&D3
Note :
&D0
In asynchronous mode (&Q0), the modem
ignores DTR.
&D1
The modem switches from data mode to
command mode when an on-to-off transition
of DTR occurs.
&D2 An on-to-off transition of DTR causes the
modem to go on-hook (hang-up) and disable
auto-answer mode. Auto-answer mode (S0
is not equal to zero) is enabled when DTR is
turned on. (default)
An on-to-off transition of DTR re-initializes
the modem. The re-initialize procedure
performs a power-up reset, except that the
UART registers are not re-configured,
The modem will not respond to a DTR toggle
in sleep or power down mode (see S-register
S30) It is recommended that a character be
sent to wake up the modem prior to toggling
DTR.
&F
Fetch Factory Configuration
This command loads command and S-register factory defaults into the active configura-
tion, and configures the modem for data mode.
12 COMMAND REFERENCE - 2