Octagon Systems 5556 User manual

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5556 Modem Card
Copyright
Copyright 2001—Octagon Systems Corporation. All rights reserved.
The contents of this document and the specifications herein may
change without notice.
Trademarks
Octagon Systems Corporation®, the Octagon logo and Micro PCare
trademarks of Octagon Systems Corporation. DiskOnChip®is a
registered trademark of M–Systems.
Notice to user
The information contained in this document is believed to be correct.
However, Octagon assumes no responsibility for any of the circuits
described herein, conveys no license under any patent or other right
and makes no representations that the circuits are free from patent
infringement. Octagon makes no representation or warranty that
such applications will be suitable for the use specified without
further testing or modification.
6510 W. 91st Ave.
Westminster, CO 80031
Technical support: 303–426–4521
Telephone: [phone]
FAX: [phone]
Web site: www.octagonsystems.com
5556 Modem Card
User’s Manual
5182(0501)

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≡FCC instructions
This product complies with part 68 of the FCC Rules and
Regulations. With each device shipped, there is a label which
contains, among other information, the FCC Registration Number
and Ringer Equivalence Number (REN) for this product. You must,
upon request, provide this information to your telephone company.
The REN is useful to determine the quantity of devices you may
connect to a telephone line and still have all of these devices ring
when the number is called. In most, but not all areas, the sum of the
RENs of all devices connected to one line should not exceed five (5.0).
To be certain of the number of devices you may connect to the line,
as determined by the REN, you should contact the local telephone
company to determine the maximum REN for your calling area.
If your system causes harm to the telephone network, the telephone
company may discontinue service temporarily. If possible, they will
notify you in advance. If advance notification is not practical, you
will be notified as soon as possible.
Your telephone company may make changes in its facilities,
equipment, operations, or procedures that could affect proper
functioning of your equipment. If they do, you will be notified in
advance to give you an opportunity to maintain uninterrupted
telephone service.
If you experience trouble with this device please contact Octagon
Systems for information on obtaining service or repairs. The
telephone company may ask you to disconnect this device from the
network until the problem has been corrected or until you are sure
that the device is not malfunctioning.
This device may not be used on coin service lines provided by the
telephone company (this does not apply to private coin telephone
applications, which use standard telephone lines). Connection to
party lines is subject to state tariffs.
≡Preface
This product sheet is a guide to the proper configuration,
installation, and operation of your 5556 Modem Card. The 5556
expansion card is part of the Octagon Micro PC system. It is
designed to be used with any other Micro PC Control Cards. You can
use your 5556 card in conjunction with other Micro PC expansion
cards, tailoring your system for a wide variety of applications. The
5556 card can also be used in an IBM-compatible PC. Micro PC

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cards are too tall to fit in an XT, but will fit in AT industrial size and
other AT-size cases. All Micro PC products are modular, so creating
a system is as easy as selecting and plugging in the products you
need.

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Table of Contents
5556 Modem Card ...........................................................................................................................................................1
Copyright......................................................................................................................................................................1
Trademarks...................................................................................................................................................................1
Notice to user...............................................................................................................................................................1
≡FCC instructions ......................................................................................................................................................2
≡Preface........................................................................................................................................................................2
Table of Contents ............................................................................................................................................................4
List of Figures ..................................................................................................................................................................5
List of Tables....................................................................................................................................................................5
Overview.......................................................................................................................................................................6
Introduction.............................................................................................................................................................6
Major features..........................................................................................................................................................6
Equipment................................................................................................................................................................7
Installation....................................................................................................................................................................8
Interrupt request......................................................................................................................................................9
Base port address....................................................................................................................................................9
AT commands............................................................................................................................................................11
Introduction...........................................................................................................................................................11
Operating modes...................................................................................................................................................11
Escape sequence...................................................................................................................................................12
Returning to online mode....................................................................................................................................12
AT commands.......................................................................................................................................................13
Result codes...........................................................................................................................................................17
S–Register..............................................................................................................................................................18
Troubleshooting.........................................................................................................................................................19
Numbers instead of words display.....................................................................................................................19
Type the AT command and do not receive an OK message.........................................................................19
The modem does not respond to your commands...........................................................................................19
The command characters do not appear on the screen...................................................................................19
Double letters appear on the screen when typing commands.......................................................................19
Technical specifications...........................................................................................................................................20
Other parameters...................................................................................................................................................21
Jumper configurations..............................................................................................................................................22

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List of Figures
Figure 1 5556 Component diagram.................................................................................8
Figure 2 5556 Card orientation.....................................................................................10
List of Tables
Table 1 Interrupt request lines: W1.............................................................................9
Table 2 Base port address: W1......................................................................................9
Table 3 Prefix, repeat, and escape commands..........................................................13
Table 4 Set 300/1200 BPS protocol.............................................................................13
Table 5 Dialing options................................................................................................13
Table 6 Echo commands..............................................................................................14
Table 7 Hook control....................................................................................................14
Table 8 Volume control................................................................................................14
Table 9 Speaker on/off.................................................................................................14
Table 10 Enable/disable result codes ...........................................................................14
Table 11 Read/write to S registers...............................................................................15
Table 12 Result code and dialing options....................................................................15
Table 13 Long space disconnect...................................................................................15
Table 14 Carrier detect (DCD) options.........................................................................15
Table 15 Data terminal ready (DTR) options..............................................................15
Table 16 Guard tone ......................................................................................................16
Table 17 Make/break pulse ratio..................................................................................16
Table 18 Other commands.............................................................................................16
Table 19 Result code summary ....................................................................................17
Table 20 S–Register summary......................................................................................18
Table 21 Performance specifications............................................................................21
Table 22 Telephone line interface specifications.........................................................22
Table 23 Interrupt request lines: W1..........................................................................22
Table 24 Base port address: W1...................................................................................22

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Overview
Introduction
The 5556 Micro PC Modem Card is a compact 56K BPS data modem
solution for the Micro PC product line. It supports baud rates up to
56K. It is AT command set compatible and will work with any
popular AT compatible communication software written for the PC.
The 5556 complies with the Bell System 103/212A and CCITT
V.22/V.22bis/V.21 protocols. It can be used with any Micro PC
Control Card or Microcontroller and occupies one slot in a Micro PC
card cage.
Major features
nCompatible Hayes AT command set
nSupports the following protocols:
–Bell System 103 and 212A
–V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34, V.34bis, V.90
nAutomatic speed selection/Automatic fallback to slower speed
nAuto–originate and auto–answer modes
nDialing capabilities:
–Autodial in tone or pulse
–Call progress monitoring
–Programmable number of rings before answer
n5V operation

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This chapter covers the installation and configuration of your 5556
Modem Card. Please refer to your software documentation for
additional information on installation and configuration of a modem.
The 5556 may be used with any Micro PC Control Card.
The 5556 contains static sensitive CMOS components. The greatest
danger occurs when the card is plugged into a card cage. The 5556
becomes charged by the user and the static discharges to the
backplane from the pin closest to the card connector. If that pin
happens to be an input pin, even TTL inputs may be damaged. To
avoid damaging your card and its components:
1. Ground yourself before handling the 5556 Modem Card.
2. Disconnect power before removing or inserting the 5556 card.
Equipment
You will need the following equipment (or equivalent) to use your
5556:
nMicro PC Control Card
n5556 Modem Card
nMicro PC Card Cage
nPower Module
nCommunication software

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Installation
Before installing the 5556 Modem Card, refer to Figure 1 for the
location of various connectors and jumpers:
Figure 1 5556 Component diagram

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Interrupt request
The interrupt request line used by the modem is configured at the
factory for IRQ3. You may change this setting by reconfiguring
jumper block W1:
Table 1 Interrupt request lines: W1
Pins Jumpered IRQ
[1-2]
[3-4]*
[5-6]
[7-8]
[9-10]
[11-12]
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
* = default
Base port address
The 5556 can be configured as COM1, COM2, COM3 or COM4. It is
configured at the factory to operate using COM3. To change the base
port address, you must reconfigure jumper block W1.
Table 2 Base port address: W1
Pins Jumpered COM port Address
[13-14]
[15-16]*
[17-18]
[19-20]
COM4
COM3
COM2
COM1
2E8-2Efh
3E8-3Efh
2F8-2FFh
3F8-3FFh
* = default
Note When using Micro PC Control Cards, be sure not to jumper the 5556
to a COM port that is used on another card. Doing so will cause
erratic and unpredictable results.

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To install the 5556 in the card cage:
Take care to correctly position the 5556 in the card cage. The Vcc and
ground signals must match those on the backplane. Figure 2 shows
the relative position of the 5556 as it is installed in the card cage.
Figure 2 5556 Card orientation
1. Verify the interrupt and COM port selections are correct for your
application.
2. Turn the card cage power off.
3. Position the cage so that the backplane is away from you, the power
module is to the right, and the open side of the cage is closest to you.
The lettering on the backplane should be right side up (for example,
you should be able to read “A31” on the backplane), with the words
“OCTAGON SYSTEMS CORP.” running vertically along the left side
of the backplane. This position is “feet down” for a table mount cage
and “feet back” for a rear mount.
4. Slide the 5556 into the card cage. The components on the card
should face to the left. The lettering on the card (“Octagon Systems
Corp.”) should be on the top edge of the card and the gold contact
fingers toward the backplane.
5. Plug the 5556 into the backplane.
6. The amber LED will light briefly whenever the card is accessed
(input or output).
7. Unplug your telephone set’s modular cable connector from the wall
jack. Then plug it into the jack labeled PHONE on the 5556
(optional). (When using the 5556’s automatic features, there is no
need to have the telephone plugged in.)

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8. Plug one end of a second modular telephone cable into the jack
labeled LINE on the 5556 and the other end into the wall telephone
jack.
9. Power on your system.
10. Set the communications speed of the 5556 to baud rates up to 56K
BPS. The 5556 defaults to 56K BPS when first powered on. Also set
the character length, parity and stop bits. Refer to your software
manual for more specific information.
Note Be sure that the settings you select for the 5556 are compatible with
the remote modem you are accessing.
11. To verify the 5556 is on–line and working correctly, select local or
terminal mode on your software program. Type:
AT <Return>
An OK message displays. If you do not receive this message:
nMake sure that the speed setting is 56K BPS in the
Communication Program
nMake sure your software program is set for an AT modem
nAlso refer to the Troubleshooting section
AT commands
Introduction
The 5556 Modem Card is AT command compatible. To use the 5556
modem, you must have access to some type of communications
software. When selecting a communications software program be
sure that it supports the basic AT command set.
Operating modes
All modems operate in two modes — command and on–line modes.
When the modem is in the command mode, it will accept all AT
commands. The modem only returns result codes when in the
command mode.
The modem is in the on–line mode when it has successfully
connected to another modem. In the on–line mode, data sent to the
modem from your system is transferred directly to the remote
modem and data received from the remote modem is transferred
directly to your system.

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To switch between modes, the following two commands are used:
nEscape sequence (+++) sets the modem from the on–line mode
back to a command mode and
nATO command returns the modem back to the online mode
again after a +++ has been issued
Escape sequence
Once the modem is on–line, the special escape sequence of +++
returns the modem to the command mode without breaking the
modem’s connection. To issue the escape sequence once the modem
is on–line. Type:
+++
After the third plus is entered, the modem should respond with an
“OK” or “0”. (The command +++ is not followed by a carriage
return).
The escape character (+) may be changed to any other character by
changing the value in the S2 register. Refer to the table on
S–Register commands.
Returning to online mode
Once you have issued an escape sequence to the modem, you are still
connected to the remote modem but in the command mode. To
return to the online mode and continue communications with the
remote system, use the O command, type:
ATO
The modem will respond with a message and return you to the on–
line mode.

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AT commands
All commands sent to the modem must begin with the attention code
AT (except for the +++ (escape) and the A/ (repeat)) commands. The
following tables group the commands by function.
Table 3 Prefix, repeat, and escape commands
Command Description
AT
A/
+++
Command line prefix that tells the modem a command
follows; must precede all of the commands, except for the
+++ (escape) and A/ (repeat) commands.
Re-execute last command line, don't precede this command
with AT or press <Enter? at the end of the command line.
Escape code: go from on-line mode to command mode;
One second pause before and after escape code entry. The
command +++ is not followed by a carriage return.
Table 4 Set 300/1200 BPS protocol
Command Description
B0
B1 Uses CCITT V.22/2100 Hz answer backtone at 1200 BPS Uses Bell 212A/2225 Hz answer backtone operation at
1200 BPS
Table 5 Dialing options
Command Description
D
P
R
T
!
@
W
,
;
Dial telephone number
Pulse dialing
Originate call in answer mode
Touch–tone dial
0.5 second hookflash
Wait for silence (default 5 seconds)
Wait for dial tone (default 30 seconds; see register S7)
Pause (default 2 seconds; see register S8)
Return to command mode after dialing

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Table 6 Echo commands
Command Description
E0
E1*
Command characters not echoed
Command characters are echoed
* = default
Table 7 Hook control
Command Description
H0*
H1
Force modem on–hook, i.e. hang up
Force modem off–hook, i.e. make the line busy
* = default
Table 8 Volume control
Command Description
L0*
L1
L2
L3
Low speaker volume
Low speaker volume
Medium speaker volume
High speaker volume
* = default
Table 9 Speaker on/off
Command Description
M0
M1*
M2
M3
Speaker is always off
Speaker is on until modem detects carrier
Speaker is always on
Speaker is on after dialing until modem detects
carrier
* = default
Table 10 Enable/disable result codes
Command Description
Q0*
Q1 Enable result codes Disable result codes
* = default

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Table 11 Read/write to S registers
Command Description
Sn?
Sn=v Read and display value of register r Set default S register to value v
Table 12 Result code and dialing options
Command Description
X0
X2
X3
X4
Basic call progress, blind dialing
Extended call progress, dial tone detection
Extended call progress, blind dialing and busy
signal detection
Extended call progress, dial tone, and busy signal
detection
Table 13 Long space disconnect
Command Description
Y0*
Y1
Long space disconnect disabled
Long space disconnect enabled
* = default
Table 14 Carrier detect (DCD) options
Command Description
&C0*
&C1
DCD always on; state of carrier signal is ignored
DCD on only in presence of carrier signal
* = default
Table 15 Data terminal ready (DTR) options
Command Description
&D0
&D1
&D2*
&D3
Ignore DTR signal
Return to command mode after losing DTR
DTR always active, hang up after transition
Modem performs soft reset
* = default

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Table 16 Guard tone
Command Description
&G0*
&G1
&G2
No guard tone
Disable guard tone
1800 Hz guard tone
* = default
Table 17 Make/break pulse ratio
Command Description
&P0*
&P1
&P2
10 pps pulse dial with make /break dial ratio of
39/61 (USA/Canada)
10 pps pulse dial with make/break dial ratio of
33/67 (Europe/Hong Kong)
20 pps pulse dial with make/break dial ratio of
33/67 @20pps
* = default
Table 18 Other commands
Command Description
A
O
P
T
V0
V1*
Z
&F
&J0*
&L0
&M0*
&V
Answer incoming call immediately
Return to on–line mode
Set pulse dial as default
Set tone dial as default
Send numeric result codes
Send word result codes
Reset modem and set modem to factory default
states
Restore factory configuration
RJ11, RJ14S, or RJ45S phone jack
Dial–up line
Asynchronous operation
Display current configuration
* = default

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Result codes
The 5556 responds to most AT commands with the following result
codes:
Table 19 Result code summary
Digit Code Definition
0
1
2
3
4
5
6
7
8
10
OK
Connect
Ring
No carrier
Error
Connect 1200
No dial tone
Busy
No answer
Connect 2400
Successfully executed command line
300 BPS connection established
Ring signal detected
Carrier not detected within Register S7 detect
time
Error found in command line; return to
command line
1200 BPS connection established
No dial tone detected within 5 seconds after
going off–hook
Busy signal detected after automatically
dialing a call
Five seconds of silence was not detected when
using the @ command in the Dial command
line
Connection established at 2400 BPS

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S–Register
The S–Register stores the current configuration of the 5556. These
settings are changed directly via “S” commands or indirectly via
commands such as the &C command. For example, each time a &C
command is issued, the content of S–Register 21 is altered. Use the
Z or &F command or power–off/on the modem to restore the default
settings. The following table lists the S–Register default settings:
Table 20 S–Register summary
Register Range/Units Description Default
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
S21
S22
S23
S24
S25
S26
S27
0–255/rings
0–255/rings
0-255/ASCII
0-127/ASCII
0-127/ASCII
0-255/ASCII
2-255/sec
1-255/sec
0-255/sec
1-255/0.1 sec
1-255/0.1 sec
50-255/msec
0-255/0.02 sec
—
Bit mapped
—
Bit mapped
—
0-255/sec
Bit mapped
Bit mapped
Bit mapped
—
0-255/0.01 sec
0-255/0.01 sec
Bit mapped
Number of rings to answer on
Count number of incoming rings
Escape character
Carriage return character
Line feed character
Backspace character
Dial tone wait time
Wait time for remote carrier
Comma pause time
Carrier detect response time
Delay between loss of remote
carrier and hang up
DTMF dialing speed
Escape guard time
Reserved
Reserved
Test mode bit mapped options
status (&T)
Reserved
Modem test timer
V.24 bit mapped status options
Speaker/results bit mapped status
options
General bit mapped options status
Reserved
DTR detection delay (sync only) or
seconds
RTS to CTS delay
General bit mapped options status
000
000
043
013
010
008
002
050
002
006
014
095
050
138 (8Ah)
000
000
52 (34h)
117 (75h)
62 (3Dh)
005
001
73 (49h)

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Troubleshooting
Numbers instead of words display
Use the ATV1 command to display long form (verbose) results code.
Type the AT command and do not receive an OK
message
Make sure your software program is set for an AT modem. Also
make sure that the speed setting of your software program or
terminal is set at 57,600 BPS and that the character length set
correctly.
The modem does not respond to your commands
Make sure you have selected the correct COM port in your
communications software program. Make sure the W1 jumpers on
the 5556 are set to the correct COM port.
The command characters do not appear on the screen
Type ATE1 <Return> and then type AT. Or, use the echo/no echo
feature in your software program.
Double letters appear on the screen when typing
commands
Both your software program and modem are echoing commands to
the screen. Use either your software program‘s echo–off command or
type ATE0 <Return>.

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Technical specifications
Data rate
Up to 56K BPS
Data format
7 or 8 data bits; 1 or 2 stop bits; odd, even or no parity
Operation
Full duplex
Dialing
Rotary (pulse) or touchtone; pulse or tone may be combined in same
dial string. Timed pulse or wait for next dial tone.
Compatibility
Bell System 103/212A and CCITT V.22/V.22bis/V.21, V.23, V.32,
V.32bis, V.34, V.34bis, V.90.
Phone connectors
Two RJ11C telephone jacks; one for telephone line connect; one for
telephone set.
Audio monitor
On–board speaker for call progress monitoring.
Built in DAA
Power requirements
+5V +/–.25V @ 115 mA typical
Environmental
–40° C to –85° C
Size
4.5 in. x 4.9 in.