Dantel 44210 User manual

CAUTION
•Install or remove modules from the shelf only when the power is off.
If you install a module in the shelf with the power on, the internal
circuitry may suffer damage and the product warranty will be void.
•Remove and install circuit boards only in a static-safe environment
(use antistatic wrist straps, smocks, footwear, etc.).
•Keep circuit boards in their antistatic bags when they are not in use.
•Do not ship or store circuit boards near strong electrostatic, electromag-
netic, magnetic, or radioactive fields.
•For more complete information on electrostatic discharge safety
precautions, refer to BellcoreTM Technical Reference # TR-NWT-000870.
Copyright 1998 by Dantel, Inc. • Dantel is a registered trademark of Dantel, Inc. • ISO 9001 Registered
Printed in the U.S.A.
INSTALLATION & OPERATION MANUAL
44210/49210-0798<90-00025>
44210 460 MODEM &
49210 TWO-LINE
INTERFACE SUBASSEMBLY
About this Practice:
This practice has been reissued to:
• Update Technical Specifications
table.
Issue date: July 1998
Reissued Practices: Updated and
new content can be identified by a
banner in the right margin.
UPDATED
Table of Contents
Ordering Information ........................................................................... 2
General Description.............................................................................. 2
Circuit Description ............................................................................... 2
Application Information ....................................................................... 7
Installation.......................................................................................... 10
Operation ............................................................................................ 16
FCC Required Information ................................................................ 20
Technical Specifications ..................................................................... 21
Warranty ............................................................................................. 22
44210-00
460 Modem
RESET
ESD
TD
DTR
RD
CD
OFF
HOOK
RING
L
I
N
E
M
O
N
44210-00 REV__
49210-00
LINE
1
LINE
2
TWO LINE
INTERFACE

PAGE 2 44210/49210-0798<90-00025>
NOTE: This section lists the different options available for this product. To order any of the avail-
able options, contact Dantel Inside Sales through our toll-free number, 1-800-432-6835.
OPTION NUMBER FEATURES
B11-44210-00 Dial-up Modem
A12-49210-00 Two-line Interface Subassembly
ORDERING INFORMATION
GENERAL DESCRIPTION
The 44210 module provides single-line, dial-up modem service between components of Dantel's 460 Alarm and Control
System (460 ACS). It also provides 212A-type digital interface
for transmitting and receiving data between data sources that
are remotely located. The optional 49210 subassembly provides
an interface to two telephone lines; a primary and a backup.
The 44210 is a plug-in module that fits into any 400-type or
similiar equipment housing. The front panel has status-indicat-
ing LEDs, normal-through and monitoring jacks, test points,
level-setting potentiometers, and a subassembly cutout window.
The optional 49210 subassembly has front panel LEDs which
are visible through the cutout window when installed on the
44210 and a board-mounted line-select switch.
CIRCUIT DESCRIPTION
The 44210 460 Modem Module and 49210 Two-Line Interface Subassembly functional schematics are shown in Fig. 1.
44210 MODULE
The 44210 460 Modem module consists of a microprocessor, an
8K EPROM (Erasable/Programmable Read Only Memory), a
128-byte EEPROM (Electrically Erasable/Programmable Re-
ceiver/Transmitter), modem and controller ICs, UARTs (Univer-

44210/49210-0798<90-00025> PAGE 3
FIG. 1 - FUNCTIONAL SCHEMATIC, 44210/49210
37 RING DETECT #1
38 RING DETECT #2 43 LINE SELECT #1
44 LINE SELECT #2
(RING)
(TIP)
(TIP)
(RING)
2-WIRE LINE #1
2-WIRE LINE #1
TO RJ11
TO RJ11
41
42
23
24
50 AUDIO MONITOR
40 OFF HOOK
–21 TO –56 VDC
GND
RCVRs
TTL
Interface
DRVRs
RCVRs
RS-232
Interface
DRVRs
RCVRs
RS-422
Interface
DRVRs
RCVRs
RS-485
Interface
DRVRs
MICRO PROCESSOR
IC A12-49210-00
TWO-LINE
INTERFACE
CIRCUIT DESCRIPTION

PAGE 4 44210/49210-0798<90-00025>
sal Asynchronous Receiver/Transmitter), TTL and RS-232
receivers/drivers, RS-422 and RS-485 receivers/drivers, MPI
inputs, off-hook and TTL outputs, ring detect/line seize circuit,
transformer, timer, eight-lever DIP switch, and regulated power
supply.
Microprocessor
The microprocessor provides central processing power to coordi-
nate virtually all on-board functions carried out by the 44210.
When power is initially applied to the 44210, a watchdog IC
resets the microprocessor and UART. The microprocessor must
pulse the watch dog IC within 1.2 seconds, or the watchdog IC
resets the microprocessor again. The microprocessor is also reset
manually using a front panel RESET button.
128-byte EEPROM
The 128-byte EEPROM provides non-volatile memory for storing
user specified data, such as telephone numbers and passwords.
The contents of the EEPROM may be changed by the user.
8K-byte EPROM
The 8K-byte EPROM provides non-volatile memory for the
microprocessor programming.
Address Latch and Decoder
The address latch and decoder reads the address switch setting
and programs the microprocessor to recognize that address. The
latch holds (latchs) the port while data is being transmitted and
received.
UART
The UART provides control of all data input/output to and from
the microprocessor and the TTL, RS-232, RS-422, and RS-485
buses. The operation of the UART is initialized by the micropro-
cessor after startup.
TTL and RS-232 Receivers/Drivers
The TTL and RS-232 interfaces have two data lines: a TXD
(transmit data) receiver and an RXD (receive data) driver. There
also are four handshaking and/or control lines: RTS (Request To
Send) and DTR (Data Terminal Ready) receivers and CD (Car-
rier Detect) and MPO (Multi-Purpose Output) drivers. Strapping
points for termination of the differential receivers are located on
the circuit board and must be placed in the TERM position for
the interface being used. For interfaces not being used, the
termination straps must be in the OFF position. Front panel
LEDs are provided on the module to indicate RVD, TXD, CD,
and DTR activity.
CIRCUIT DESCRIPTION

44210/49210-0798<90-00025> PAGE 5
RS-422 and RS-485 Receivers/Drivers
The RS-422 and RS-485 interfaces are differential receivers and
drivers. They are used when the modem is located greater
distances from the data terminal equipment. The RS-422 and
RS-485 interfaces do not use the RTS handshaking lines. When
using the RS-485 interface, only a TXD receiver and RXD driver
is available. When the TXD receiver recognizes a driver from the
terminal equipment, DTR is activated on the modem. When a
carrier is detected on the facility side, the CD signal on the
modem enables the RXD driver. Using this interface (RS-485)
requires only two pairs of wires for TXD and RXD, and no wires
are required for DTR and CD. The circuit board has two strap-
ping points to force RTS and DTR to the active (ON) state if
these handshaking lines are not used by the data terminal
equipment connected to the modem. If handshaking is used, the
straps should be in the OFF position. Strapping points for
termination of the differential receivers are located on the
circuit board and must be placed in the TERM position for the
interface being used. For interfaces not being used, the termina-
tion straps must be in the OFF position. Front panel LEDs are
provided on the module to indicate RXD, TXD, CD, and DTR
activity.
MPI Inputs
Six MPI inputs directly interface the microprocessor on the
44210 using edge connector pins. When an MPI input becomes
active, the microprocessor's input goes to a low state, causing
the microprocessor to perform a dial-out. One of the MPI inputs
(pin 22) is TTL/CMOS-compatible and is activated by grounding
(ground to 1.5 VDC) and inactive when left open (3.0 to 5.0
VDC). The other five MPI inputs (pins 46, 48, 52, 54, and 56) are
ground activated (ground to -2.0 VDC) and inactive when left
open or at minus battery voltage (-21 to -56 VDC).
Modem and Controller
This circuit converts data to tones and tones to data between the
line-side facility (tones) and the data terminal equipment (DTE).
The controller contains a full Hayestm-compatible command set
in internal ROM and controls all of the modem's functions. The
modem has PSK and FSK modulators and demodulators for both
300 and 1200 baud operation. It also contains a DTMF generator
and call-progress-mode filters. The audio output of the circuit
may be monitored by edge connector pins or front panel jacks.
Ring Detect/Line-Seize Circuit
This circuit detects ringing tones and seizes the circuit and
holds the line active for the modem and controller.
CIRCUIT DESCRIPTION

PAGE 6 44210/49210-0798<90-00025>
Transformer
The transformer provides protective isolation between the line-
side facility and the module's modem tones-generating circuitry.
Eight-Lever DIP Switch
The switch provides programming for mode selection and
interface parameters (for example: data bits, stop bits, baud
rate, and so forth).
Regulated Power Supply
The power supply provides regulated +/-12 VDC and +/-5 VDC
output power for the module's circuits from -21 to -56 VDC input
power.
49210 SUBASSEMBLY
The subassembly's circuits consist of two ring detectors, two
line-select inputs, a line-switching relay, indicating LEDs,
control logic, and an over-ride switch.
Ring Detectors
Each of the two ring detectors provides ring detection for one of
the two lines. The output of a detector goes to a low (0 volts)
logic state when ringing voltage is detected on its associated
line. When there is no ringing voltage detected, the output
remains at a high (+5 VDC) logic state.
Line-Select Inputs
The line-select inputs control the line-switching relay. When the
line-select input for line 1 is grounded, (with input 2 open or at a
high logic level), the line-switching relay is OFF and line 1
remains connected to the 44210 modem. When the line-select
input for line 2 is grounded (with input 1 open or high), the relay
is ON and line 2 is connected to the 44210 modem. If both line-
select inputs are open or at a high level, the relay remains in the
state appropriate to the last selected line. If both line-select
inputs are grounded, the relay is OFF, and line 1 is connected to
the 44210 modem.
Line-Switching Relay
The relay is operated by the line-select inputs and is the dry-
contact type.
LEDs
Front panel LEDs are provided to indicate two things: which
line is currently connected to the 44210 modem and/or the
presence of ringing voltage. If an LED is ON continuously, it
indicates that line has been selected and is connected to the
44210 modem through the line-switching relay. If an LED is
CIRCUIT DESCRIPTION
49210-00
LINE
1
LINE
2
TWO LINE
INTERFACE

44210/49210-0798<90-00025> PAGE 7
flashing (approximately 2 seconds ON and 4 seconds OFF), it
indicates detection of interrupted ringing voltage and that the
line is not connected to the 44210 modem.
Control Logic
The control logic provides logic gating between the line-select
inputs and also between their respective status-indicating
LEDs.
Override Switch
The switch overrides the relay and line selectors, connecting
only the selected line to the 44210 modem. If the override switch
is in the center (OFF) position, then line selection is done by the
line selectors.
CIRCUIT DESCRIPTION
APPLICATION INFORMATION
Applications for the 44210 consist of providing dial-up modem functions for Dantel's 460 Alarm and Control System (460
ACS) for the distant transmission of alarm system data between
remote locations and a central processing center. The 44210 is
also used to provide standard HayesTM-compatible modem
functions and can be connected directly to a computer, dumb
terminal, or other Data Terminal Equipment (DTE) for commu-
nication with a remote DTE's modem.
460 ACS Master and Remote Modes
Refer to Fig. 2. One 46020 Multiple Alarm Processor (MAP) is
equipped with 46800-58 firmware and is communicating through
a 44210 located at a central processing center (master site). The
44210 at the master site is connected by phone lines to other
44210 modules located at individual remote sites. The remote
44210s are interfaced to 46009 or 46010 Multiple Alarm Trans-
mitters (MATs) and 46028 Control Point Modules (CPMs) using
TTL, RS-232 or RS-422.
The modem at the master site is configured by switches for
Master Mode operation and those at the remote sites are config-
ured for Remote Mode. The master modem controls all remote
modems. Each remote modem has an exclusive phone number
and is accessed by the master modem only.
The MAP initiates polling a remote site by sending a command
to the 44210 modem to dial a remote site's phone number. The
master modem dials the number and the remote modem at the
remote site answers the call. Carrier signals between both
modems then link the communications path, which allows the
NOTE:
The 44210 modem configured for
Master Mode must be equipped
with a 49210 Two-line Interface
Subassembly.

PAGE 8 44210/49210-0798<90-00025>
MAP to begin interrogating the MATs and CPMs at the remote
site and receiving their responses. When the MAP is done
interrogating the remote site, it commands the modem to hang
up and receives verification from the modem's OFF HOOK
output (pin 40 on the modem is connected to pin 26 of the MAP)
that the master site modem has gone back on hook.
The MAP/44210 modem combination allows remote alarm and
control sites to be polled continuously in any user-specified order
or to be polled a single time at a user-specified time interval.
On the remote site 44210, one or more of the alarm level output
relays (A through D) of a MAT are connected to the MPI inputs
of the 44210. When an alarm occurs at the remote site, the
ground output from the MAT's relay goes to the modem and
turns it on. The modem retrieves the user-specified number to
call, (the phone number unique to the master site), from the on-
board, non-volatile memory and calls the master 44210 with the
alarm data.
For operating information and command syntax for the 460
Alarm and Control System, refer to the 46800-58 MAP Firm-
ware Manual.
HayesTM Mode
Refer to Fig. 3. When the option switches and straps are set
appropriately, the 44210 may be used as a HayesTM-type compat-
ible modem for transmitting data from a computer's serial port
to another computer or other DTE equipment that is equipped
with a modem. When in this mode, the modem can be operated
with almost any data communications software that uses a
HayesTM-compatible command set. Refer to Table B or your
computer's software manual for modem operating commands.
Use the following table to connect the modem to the
RS-232 port of a computer.
NOTE:
All MATs located at remote sites
must be configured for Annuncia-
tor Mode (S3-1 and 2, both ON).
Refer to the 46009 or 46010 MAT
documentation.
44210 PIN-OUTS
21
14
17
20
15
19
FUNCTION
TXD
RXD
GND
RTS
DCD
DTR
DB-9 PINS
3
2
5
7
1
4
DB-25 PINS
2
3
7
4
8
20
Auto-Answer
Refer to Fig. 2. When a 44210 is configured in this mode, it acts
as an auto-answer modem (not HayesTM-compatible). It answers
an incoming call and establishes communications only. There is
no automatic call-out on alarm or password features. When it
hangs up, it will send a garbage character to the device to which
it is connected. If the modem calling into it is a HayesTM-type
APPLICATION INFORMATION

44210/49210-0798<90-00025> PAGE 9
modem, it must hang up itself after sending "+++". This mode is
usually used when a 44210 is tied to a MAP's or 46062 General
Purpose Processor's (GPP) Printer Port.
Option Strapping and Switch Settings
The 44210 has straps to configure the RS-422 and RS-485 ports
and the operation of RTS and DTR. An eight-lever mini-DIP
switch provides mode selection (212A HayesTM compatible, 460
ACS Master Mode, 460 ACS Remote Mode, and Auto-Answer
Mode), one or two stop bits, seven-bit or eight-bit data word,
even or odd or no parity, and 300 or 600 baud operation. Refer to
Installation section
Subassembly
The 44210 accepts a plug-in subassembly, the 49210 Two-Line
Interface Subassembly. It provides an additional backup line so
system data may still be transmitted/received in the event of a
line failure. The 49210 has a single on-board switch to select
either two-line or single-line operation. The subassembly may be
ordered factory-installed or may be installed in the field. Refer
to Installation section
FIG. 2 - EXAMPLE APPLICATION, 460ACS MODE
APPLICATION INFORMATION
Public Switched
Telephone Network
(PSTN)
Printer
Port
Auto-Answer Mode
MASTER SITE
TO
TELEPHONE
LINES
4
4
2
1
0
MATs
and
CPMs
REMOTE SITE 1
4
4
2
1
0
MATs
and
CPMs
REMOTE SITE 2
MATs
and
CPMs
REMOTE SITE 3
4
4
2
1
0
4
4
2
1
0
4
6
0
2
0
4
4
2
1
0
MAP

PAGE 10 44210/49210-0798<90-00025>
FIG. 3 - EXAMPLE APPLICATION, HAYESTM MODE
APPLICATION INFORMATION
INSTALLATION
Verify that the proper switch and strap settings have been made. Refer to Table A and Figs. 5-8.
Wiring
In most cases, the 56-pin edge connector is prewired at the
factory. If custom wiring is required, refer to Fig. 9 for module
edge connector pin designations or contact Dantel. Wire the
connector in the shelf or housing as required.
Subassembly Mounting
The front panel plug of the 44210 is removable to allow the
subassembly front panel to appear in the front panel cutout. The
optional 49210 subassembly replaces a subassembly bypass card
that is plugged into connector J5 of the 44210. Four screws must
be removed prior to mounting the 49210 on connectors J4, J5,
and J6. Refer to Fig. 4. After mounting the 49210 on the 44210
module, replace the same four screws to hold the subassembly
securely in place.
NOTE:
If a bypass card is installed in
the place of the 49210 Two-line
Interface, use only line 1 (pins 41
and 42).
Public Switched
Telephone Network
(PSTN)
4
4
2
1
0
4
4
2
1
0
SERIAL RS-232
SERIAL RS-232
MODEM TONES
MODEM TONES

44210/49210-0798<90-00025> PAGE 11
Checkout
Refer to the firmware manual, 46800-58, for command syntax
and operating instructions when using the modem in 460 ACS
mode. If the 44210 is used in Hayes-compatible mode, refer to
Table B or the instruction manual of the communications
software in use. Checkout of the 44210 is done by placing the
44210 in operation with one or more 44210s or similiar modems
at the distant end that are known to be good. Monitor their
operation by sending and receiving data between them. Monitor
the front panel LEDs to verify proper operation. Refer to Table C
for front panel LED operating information.
When performing the initial module/subassembly checkout, care
should be taken that the switch and strap settings are correct
for the application. Refer to Table A and Figs. 5-8.
Checkout procedures for the optional 49210 subassembly consist
of dialing through both lines of the unit under test and verifying
proper operation by the computer or DTE that is interfaced to
the 44210 modem. The front panel LEDs of the 49210 should be
monitored as well. Refer to Table C for front panel LED operat-
ing information.
TABLE A - SWITCH AND STRAP SETTINGS, 44210/49210
44210 MODULE
STRAP
422TXD
422DTR
485TXD
RTS
DTR
POSITION
TERM
GND
TERM
GND
TERM
GND
EXT
ON
EXT
ON
DESCRIPTION
180-ohm termination across RS-422 TXD inputs (pins 5 and 6).
Use only when RS-422 TXD is used.
Grounds the RS-422 TXD negative (-) input (pin 6). Use when the
RS-422 TXD is not used.
180-ohm termination across RS-422 DTR inputs (pins 7 and 8).
Use only when RS-422 DTR is used.
Grounds the RS-422 DTR negative (-) input (pin 8). Use when the
RS-422 DTR is not used.
180-ohm termination across RS-485 TXD inputs (pins 3 and 4).
Use only when RS-485 TXD is used.
Grounds the RS-485 TXD negative (-) input (pin 4). Use when the
RS-485 TXD is not used.
RTS activated by pin 32 (TTL) or 20 (RS-232)
RTS always active. Use when RTS is not required or when using
RS-422 or RS-485.
DTR activated by pin 31 (TTL), pin 19 (RS-232), pins 7 and 8
(RS-422), or when RS-485 is used.
DTR always active. Use when DTR is not used.
CONTINUED . . .
INSTALLATION

PAGE 12 44210/49210-0798<90-00025>
SWITCH
S1 POSITION 1
2
OFF
DESCRIPTION
Only line 1 connected to 44210 modem
Only line 2 connected to 44210 modem
Whichever line receives ringing voltage is connected to 44210 modem.
SWITCH
S1-1
S1-2
S1-3
S1-4
S1-5
S1-6,7
S1-8
SETTING
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON,ON
OFF,ON
ON,OFF
OFF,OFF
ON
OFF
DESCRIPTION
460 Remote Mode or Auto-Answer Mode
Hayes Mode
Not Used
1200 Baud on DTE side
300 Baud on DTE side
1 Stop Bit
2 Stop Bits
8-bit Word Length
7-bit Word Length
Even Parity
Odd Parity
Reserved
No Parity
Auto-Answer Mode
460 Remote Mode
460 ACS REMOTE MODE, AUTO-ANSWER MODE, OR HAYES-COMPATIBLE MODE
OPERATING MODE (SEE NOTE BELOW)
SWITCH
S1-1
S1-2
S1-3 thru 7
S1-8
SETTING
ON
ON
OFF
ALL OFF
ON
DESCRIPTION
Required for Master Mode
1200 Baud Operation
300 Baud Operation
Master ID #1
Required for Master Mode
MASTER MODE
49210 SUBASSEMBLY
TABLE A CONTINUED - SWITCH AND STRAP SETTINGS, 44210/49210
NOTE: Refer to the Application Information section for a complete
discussion of operating modes.
INSTALLATION

44210/49210-0798<90-00025> PAGE 13
FIG. 4 - SWITCH AND STRAP LOCATIONS, 44210/49210
P5
49210
SUBASSEMBLY
15
P6
P4
15
1
5
ON
EXT DTR
ON EXT
RTS
GND TERM
422DTR
422TXD
485TXD
1 OFF 2
S1 S1
S1
1234
OFF
ON
5678
BOTTOM VIEW OF MODULE
8
1
OFF
S1
1234
OFF
ON
5678
SWITCH S1-1 THROUGH S1-8
POSITIONS AS SHOWN
BOTTOM VIEW OF MODULE
FIG. 5 - SWITCH SETTINGS, 460 ACS MASTER MODE
INSTALLATION

PAGE 14 44210/49210-0798<90-00025>
FIG. 6 - SWITCH SETTINGS, 460 ACS REMOTE MODE
FIG. 7 - SWITCH SETTINGS, 460 ACS HAYES MODE
FIG. 8 - SWITCH SETTINGS, 460 ACS AUTO-ANSWER MODE
INSTALLATION
S1
1234
OFF
ON
5678
SWITCH S1-1 THROUGH S1-8
POSITIONS AS SHOWN
BOTTOM VIEW OF MODULE
S1
1234
OFF
ON
5678
SWITCH S1-1 THROUGH S1-8
POSITIONS AS SHOWN
BOTTOM VIEW OF MODULE
S1
1234
OFF
ON
5678
SWITCH S1-1 THROUGH S1-8
POSITIONS AS SHOWN
BOTTOM VIEW OF MODULE

44210/49210-0798<90-00025> PAGE 15
FIG. 9 - PIN DESIGNATIONS, 44210 MODEM
56 55
54 53
52 51
50 49
48 47
46 45
44 43
42 41
40 39
38 37
36 35
34 33
32 31
30 29
28 27
26 25
24 23
22 21
20 19
18 17
16 15
14 13
12 11
10 9
87
65
43
21
CIRCUIT SIDE
OF PC BOARD
COMPONENT SIDE
OF PC BOARD
MPI
MPI
MPI
Audio Monitor
MPI
MPI
Line Select #1Line Select #2
2-Wire Line #12-Wire Line #1
Off Hook
Ring Detect #1Ring Detect #2
-21 to -56 VDC
DTR (TTL)RTS (TTL)
RXD (TTL)TXD (TTL)
MPO (TTL)CD (TTL)
2-Wire Line #22-Wire Line #2
TD (RS-232)MPI (TTL)
DTR (RS-232)RTS (RS-232)
GroundMPO
CD (RS-232)MPO (RS-232)
MPORD (RS-232)
RX- (RS-422)RX+ (RS-422)
CD- (RS-422)CD+ (RS-422)
DTR+ (RS-422)DTR- (RS-422)
TX+ (RS-485)TX- (RS-422)
TX+ (RS-485)TX- (RS-485)
RX- (RS-485)RX+ (RS-485)
INSTALLATION

PAGE 16 44210/49210-0798<90-00025>
OPERATION
Operation of the 44210 is a function of the module's firmware programming and/or modem communication software. For
information on using the modem with Dantel's 460 Alarm and
Control System (460 ACS), refer to Fig. 10 and the Application
section of this manual. For information on using the 44210 as a
HayesTM-compatible modem, or dumb 202 modem, refer to
Table B, and the documentation specific to the communication
software being used. For a description of Hayes mode, refer to
the Application section.
TABLE B - HAYES-COMPATIBLE COMMAND SET, RESPONSE CODES, AND REGISTERS USED
COMMAND SET
COMMAND
AT
A/
+++
D
P
T
’
!
/
@
W
;
R
A
B/B0
B1
C/C0
C1
E/E0
E1
F/F0
F1
H/H0
H1
H2
DESCRIPTION
Attention Prefix. Precedes all commnad lines except “+++” (escape) and “A/” (repeat)
commands.
Causes the last command line to be repeated. This command is not repeated by a
carriage return.
Escape code. The modem goes from on line state to command state (one second pause
before and after escape code entry). This command is not followed by a carriage
return.
Dial. Precedes the phone number that is to be dialed. The last digit of the phone
number is followed by a carriage return.
Pulse. Causes a pulse to be sent.*
Touch tone. Initialize the modem for touch tone dialing.
Pause. Causes a pause to be inserted in a command string (i.e., between the area code
and the seven digit phone number, etc.).
Flash. Causes a hook flash.
Causes a 1/8 second wait before the command is acted upon.
Causes the modem to wait for silence on the line before doing a command.
Causes the unit to wait for a second dial tone before acting on a command.
Returns the modem to the command state after dialing.
Reverses the mode to call an originate-only modem.
Causes the modem to answer a call without waiting for a ring.
Puts the modem in CCITT V.22 mode.
Puts the modem in BELL 103 and 212A mode.
Turns OFF the transmit carrier signal.
Turns ON the transmit carrier signal.*
Characters entered via the keyboard are not echoed to the computer or dumb terminal
screen.
Characters are echoed to the computer or dumb terminal screen.
Half duplex operation.
Full duplex operation.*
On hook (hang up).
Off hook - line and auxiliary relay.
Off hook - line relay only.
CONTINUED . . .

44210/49210-0798<90-00025> PAGE 17
TABLE B CONTINUED - HAYES-COMPATIBLE COMMAND SET, RESPONSE CODES, AND REGISTERS USED
COMMAND SET
COMMAND
I/I0
I1
I2
L/L1
L2
L3
M/M0
M1
M2
O
O1
O2
Q/Q0
Q1
Sr?
Sr=n
V/V0
V1
X/X0
X1
X2
X3
X4
Y/Y0
Y1
Z
DESCRIPTION
Request product I.D. code.
Request firmware revision number.
Test the internal memory.
Set the speaker volume LOW.
Set the speaker volume MEDIUM.*
Set the speaker volume HIGH.
Set the speaker always LOW.
Set the speaker ON until carrier is detected.*
Set the speaker always ON.
Go to an on line state.
Set remote digital loopback OFF.*
Request a remote digital loopback.
Display the result codes.*
Do NOT display the result codes.
Request the current value of register r.
Sets the register r to the value of n.
Digit result codes ON.
Word result codes ON.
Unit set to be compatible with Hayes-type 300 baud modems.*
Result code CONNECT 1200 enabled.
Enables dial tone detection
Enables busy signal detection.
Enables both dial tone and busy signal detection.
Long space disconnect disabled.*
Long space disconnect enabled.
Software reset. Restores all default settings.
DIGIT CODE
0
1
2
3
4
5
6
7
8
WORD CODE
OK
CONNECT
RING
NO CARRIER
ERROR
CONNECT 1200
NO DIAL TONE
BUSY
NO ANSWER
RESULT CODES
DESCRIPTION
Command executed.
Connect at 300 or 1200 bps.
Ringing signal detected.
Carrier signal is not detected or has been lost.
Illegal command, there is an error in the command line, the
command line exceeds the buffer (40 characters including
punctuation), or it is an invalid character format at 1200 bps.
Connect at 1200 bps. Result from X1, X2, X3, or X4 command
only.
A dial tone was not detected and subsequent commands not
processed. Result from X2 or X4 command only.
Busy signal detected and subsequent commands not processed.
Result from X3 or X4 command only.
Silence not detected and subsequent commands not processed.
Result from @ command only.
CONTINUED . . .
OPERATION

PAGE 18 44210/49210-0798<90-00025>
TABLE B CONTINUED - HAYES-COMPATIBLE COMMAND SET, RESPONSE CODES, AND REGISTERS USED
REGISTER
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
RANGE/UNITS
0-255 Rings
0-255 Rings
0-127 ASCII
0-127 ASCII
0-127 ASCII
0-32, 127 ASCII
2-255 Sec.
1-255 Sec.
0-255 Sec.
1-255 1/10 Sec.
1-255 1/10 Sec.
50-255 m.s.
2-250 1/50 Sec.
Bit Mapped
Bit Mapped
Bit Mapped
0, 1, 2, 4
SOFTWARE REGISTERS USED BY THE COMMAND SET
DESCRIPTION
Ring to answer telephone on.
Number of rings.
Escape code character.
Character recognized as carriage return.
Character recognized as linefeed.
Character recognized as backspace.
Wait time for dial tone.
Wait time for carrier.
Pause time caused by comma.
Carrier detect response time.
Delay between loss of carrier and hang up.
Duration and spacing of touch tones.
Escape code guard time.
UART status register.
Option register.
Flag register.
Test modes.
DEFAULT
0
0
43(+)
13(CR)
10(LF)
8(BS)
2
30
2
6
7
70
50
none
none
none
0
The 44210 has front panel LEDs that indicate TD (Transmit
Data), DTR (Data Terminal Ready), RD (Receive Data), CD
(Carrier Detect), OFF HOOK, and RING. These LEDs will
illuminate when that function becomes active. The unit also has
front panel phone jacks, a reset button, and a subassembly
cutout window to view the front panel of an optional 49210 Two-
Line Interface Subassembly. When no subassembly is mounted
on the 44210, a bypass card is mounted in place of the subas-
sembly and a plastic insert fills the cutout opening. Refer to
Fig. 10 and Table C.
The 49210 has front panel LEDs that indicate activity for each of
the two lines. The LEDs are designated LINE 1 and LINE 2 and
are visible through a cutout on the front panel of the 44210
module. Refer to Fig. 10 and Table C.
OPERATION
FIG. 10 - FRONT PANEL VIEWS
44210-00
460 Modem
RESET
ESD
TD
DTR
RD
CD
OFF
HOOK
RING
L
I
N
E
M
O
N
49210-00
LINE
1
LINE
2
TWO LINE
INTERFACE
44210-00 REV__

44210/49210-0798<90-00025> PAGE 19
DESIGNATION
LINE 1
LINE 2
NAME
Line 1
Line 2
OPERATION
Comes ON, and stays ON, as long as line 1 of the 49210
subassembly is active.
Comes ON, and stays ON, as long as line 2 of the 49210
subassembly is active.
49210
44210
DESIGNATION
TD
DTR
RD
CD
OFF HOOK
RING
NAME
Transmit Data
Data Terminal Ready
Receive Data
Carrier Detect
Off Hook
Ring
OPERATION
Flashes when the module receives transmitted data from the
DTE side.
Comes ON when the module recognizes a DTR handshaking
signal from the DTE side.
Flashes when the module is receiving tones from a data source
on the line side.
Comes ON when carrier tones are detected from a data source
on the line side.
Comes ON, and remains ON, as long as the modem is off-hook
to the line (the line has been seized). When a call has been
terminated and the line released, the OFF HOOK LED goes
OFF.
Comes ON when ringing voltage is detected. Goes OFF when
ringing voltage is no linger detected.
NOTE: If an LED is flashing (approximately 2 seconds ON and 4 seconds OFF) it indicates detection
of interrupted ringing voltage and that the line is NOT connected to the modem.
OPERATION
TABLE C - FRONT PANEL LED OPERATION

PAGE 20 44210/49210-0798<90-00025>
FCC REQUIRED INFORMATION
The following are requirements of Part 68 of FCC Rules:
1. The installer of this equipment is responsible for notifying the tele-
phone company that it is being connected or disconnected.
2. This equipment is not to be connected to party lines or coin tele-
phone service.
3. The telephone company has the right to temporarily discontinue
service (Section 68.108) and to change facilities and services which
may affect the operation of this equipment. Adequate written no-
tice will be provided to the user to maintain uninterrupted service
(Section 68.110B).
4. In case of trouble, contact the manufacturer’s authorized agent.
5. When the installation of this device requires connection or changes
to the internal wiring of registered telephones or other registered
devices, such changes and connections can be made only by the
registered grantee or authorized agents, equipment manufacturers,
registered telephone refurbishers, telephone companies, and those
qualified for the installation of KN and PN systems under Section
68.215 of the rules. The installer of this equipment is advised, in
the interest of safety, that the host equipment be disconnected from
all power sources and the telephone network when the installation
is being made.
6. Installation of this equipment as an adjunct can be made only with
permission of the owner of the host equipment.
FCC required information pertaining to this module:
Registration Number: DPH622-60575-MD-E