XECOM XE5614L Datasheet

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XE5614L

October 2000

Compact 56 KBPS Modem Module for Embedded Applications

Description

Xecom's XE5614L is a complete, 56 Kbps modem in a single component. The XE5614L can be used in throughout North America and Japan. It includes user transferrable FCC Part 68 Registration.

The XE5614L is a complete modem including the DAA. XE5614L users do not need to add RAM, ROM, Crystals, low distortion transformer, or switches to complete the modem design. The user only needs to provide the TTL level, serial interface and the telephone line connection.

The XE5614L is a full-featured modem. Besides 56 Kbps data transfer, the XE5614L supports data compression, error correction and fax transfer. The XE5614L also includes NVRAM for permanent storage of the modem configuration.

The XE5614L is pin compatible with Xecom's XE1414L, and XE3314L modems. This family of modems permits a simple upgrade path from 14,400 bps to 56,000 bps.

Features

*Meets telecom requirements for North America, and Japan: Includes User Transferrable FCC Part 68 Regis-

tration

*Small Size: 2.75 inches by 1.38 inches by 0.42 inches;

*Modem Protocols for data transmission from 56 KBPS down to 300 BPS: XEV.90 (56 Kbps), V.34bis, V.34,

V.32bis, V.32, V.22bis, V.22, V.21, Bell 212A and 103;

*Modem Control and Configuration via standard AT Commands

*Fax Protocols: V.17, V.29, V.27ter, and V.21 channel 2

*Error Correction; V.42, MNP2-4 and MNP10

*Data Compression; V.42bis and MNP5 provides a maximum effective data rate of 133,400 bps.

*Non-Volatile Memory including for storing telephone numbers and modem configuration.

*Standard operating temperature range 0C to 70C. Extended operating temperature range of -40C to +85C is availalble.

Serial I/O

Block Diagram

 

 

 

/DTR

 

 

/RTS

 

 

/CTS

 

 

/DSR

ROM

 

TXD

 

RXD

 

Tip

/DCD

Analog

Modem

Front

DAA

Controller

Ring

End

Auxiliary I/O

 

RESET

NVRAM

 

 

 

AR

 

 

OH

 

 

AMP

 

 

XECOM

(1)

XE5614L

XE5614L Mechanical Specifications

 

INCHES

METRIC(MM)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIN

MIN

MAX

MIN

MAX

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

A

2.74

2.760

69.60

70.10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

1.370

1.390

34.80

35.31

 

 

 

 

 

 

 

 

 

C

0.420

0.430

10.67

10.92

 

 

 

 

 

 

 

 

 

D

1.190

1.210

30.23

30.73

 

 

 

 

 

 

 

 

 

E

1.890

1.910

48.01

48.51

 

 

 

 

 

 

 

B

F

0.125

0.200

3.18

5.08

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G

0.080

0.100

2.03

2.54

 

 

 

 

 

 

 

 

 

H

0.415

0.435

10.54

11.05

 

 

 

 

 

 

 

 

 

J

0.090

0.110

2.29

2.79

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K

0.020

0.025

0.51

0.64

 

 

 

 

 

 

 

 

 

Denotes Pin 1

Pins = 0.025 inch square pin; All pins tin-plated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G

 

 

 

 

 

 

 

 

 

 

 

 

 

G

 

 

 

 

 

 

 

 

 

 

J

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XE5614L PIN CONFIGURATION

NC

1

40

VCC

AR

2

39

/DSR

RXD

3

38

/DCD

NC

4

37

NC

NC

5

36

RESET

NC

6

35

NC

NC

7

34

NC

NC

8

33

NC

/DTR

9

32

NC

NC

10

31

NC

/CTS

11

30

OH

NC

12

29

NC

TXD

13

28

NC

/RTS

14

27

NC

NC

15

 

 

/RI

16

 

 

TIP

18

 

 

RING

20

22

AMP

21

GND

 

 

 

 

XECOM

(2)

XE5614L

XE5614L PIN DESCRIPTIONS

PIN NAME

DESCRIPTION

1

NC

No Internal Connection

2

AR

Auxiliary Data/Voice Relay, Active High Output, TTL/CMOS. The AR signal goes high when ever the

 

 

modem is in the on-hook state. It can be connected to an external relay to switch control of the tele-

 

 

phone line between the modem and an auxiliary handset when.

3

RXD

Received Data, Output, TTL. Serial data output to the host. A logic "High" on RXD represents a

 

 

"mark" and a logic "Low" represents a "space".

4-8

NC

No Internal Connection

9

\DTR

Data Terminal Ready, Input, active Low, TTL. The "AT&D" command sets the function of \DTR. The

 

 

default, AT&D2, requires the host to assert \DTR to permit a modem link. The modem drops the call in

 

 

progress if \DTR is revoked and will not connect until \DTR is reasserted.

10

NC

No Internal Connection

11

\CTS

Clear to Send, Output, active Low, TTL/CMOS. \CTS provides the flow control output from the modem

 

 

when hardware flow control is selected. The modem revokes \CTS when the modem's input buffer is

 

 

full. The modem reasserts \CTS when the buffer can accept more data without a buffer overflow.

12

NC

No Internal Connection

13

TXD

Transmit Data, Input, TTL. Serial data input from the host. A logic "High" represents a "mark" and a

 

 

Low represents a "space", TTL.

14

\RTS

Request to Send, input, active Low, TTL. The XE5614L uses \RTS for hardware flow control. When

 

 

\RTS is revoked; hardware flow control is enabled, and the modem will not place data on RXD.

15

NC

No Internal Connection

16

\RI

Ring Indicator, Output, active Low, TTL. When low indicates the modem is receiving a ring signal.

18

TIP

Tip connection to the phone line (RJ11 pin 3) from the internal DAA. The XE5614L is not sensitive to

 

 

the battery voltage polarity across Tip and Ring.

20

RING

Ring connection to the phone line (RJ11 pin 4) from the internal DAA.

21

GND

Ground (0 volts)

22

AMP

Audio Output function is set by L & M commands and the value in register S22. This output can drive a

 

 

minimum load of 300 ohms.

27-29

N/C

No Internal Connection

30

OH

Off-Hook, Output, active High. OH indicates the modem's hookswitch relay is closed. Hookswitch clo-

 

 

sure connects the modem to the telephone line. This signal is available only on the XE5614L.

31-35

N/C

No Internal Connection

36

RESET

Hardware reset pin, Input, active High, TTL. A high on Pin 36 initiates a hardware reset. An external

 

 

reset is not required or recommended. The Reset pulse must be held a minimum of 100 milliseconds.

37

N/C

No Internal Connection

38

\DCD

Data Carrier Detect, Output Active Low, TTL/CMOS. The &C command sets the function of \DCD. In

 

 

the default state \DCD activates when a valid carrier is detected.

39

\DSR

Data Set Ready, Output, active Low, TTL/CMOS. &S sets the \DSR function. In the default condition,

 

 

AT&S0, \DSR is forced true.

40

Vcc

+5 Volts

 

 

 

XECOM

(3)

XE5614L

XE5614L ABSOLUTE MAXIMUM RATINGS

 

SUPPLY VOLTAGE - Vcc

+6.5 Volts

DC INPUT VOLTAGE

-0.6 Volts to +6.5 Volts

STORAGE TEMPERATURE RANGE

-25° C TO +85° C

LEAD TEMPERATURE (Soldering, 2 sec per wave)

260° C

OPERATING TEMPERATURE RANGE

0 TO 70° C

*Exceeding these values may result in permanent damage to the device.

XE5614L ELECTRICAL SPECIFICATIONS

 

Parameter

 

Min

 

 

Typ

 

 

Max

 

Units

 

 

 

Comments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC

4.75

 

 

 

 

 

 

 

 

 

5.25

 

 

 

Volts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ICC

130

 

 

150

 

 

170

 

 

 

 

ma

 

 

 

On Line

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

45

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sleep Mode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ring Voltage Detected

38

 

 

 

 

 

 

 

 

 

 

150

 

 

 

 

RMS

 

 

 

Type B Ringer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ring Frequency Detected

15.3

 

 

 

 

 

 

 

 

 

68

 

 

 

 

Hz

 

 

 

Type B Ringer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Telephone Loop Current

20

 

 

 

 

 

 

 

 

 

 

100

 

 

 

 

ma

 

 

 

Off-Hook

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Data Transmit level

-12

 

 

-10.5

 

-9.0

 

 

 

 

dBm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DTMF Transmit Level

 

 

 

 

 

 

 

-2.5

 

 

0

 

 

 

 

 

dBm

 

 

 

Avg over 3 second interval

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XECOM

(4)

XE5614L

XE5614L Typical Connection Diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/DCD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+ 5 Volts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/DSR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16C550

SIN

 

 

 

 

 

RXD

 

 

 

/DSR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

UART

 

 

 

 

 

 

 

 

 

 

 

XE5614L

 

/DCD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/DTR

 

 

 

 

 

/DTR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/CTS

 

 

 

 

 

/CTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SOUT

 

 

 

 

 

TXD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/RTS

 

 

 

 

 

/RTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/RI

 

 

 

 

 

/RI

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RJ11

3

 

 

 

 

 

 

 

 

 

 

 

 

FB1

 

 

 

TIP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.2 ufd

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FB2

 

 

 

 

 

 

 

AMP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RING

 

 

 

GND

 

 

 

 

 

 

250 ufd

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50K

 

LM386

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8 ohm,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C1

 

 

 

 

 

 

 

 

C2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.05 ufd

 

 

 

 

 

 

 

 

 

 

 

.5 W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10 ohms

 

 

 

 

 

 

 

 

 

 

speaker

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note: RJ11 Pin assignments reflect a 6-pin connector. Tip and Ring are always the center pins of the RJ11 Jack.

Recommended Parts

 

Reference Designation

Description

Recommended Part Number

 

 

FB1, FB2

Ferrite Beads

TDK ACB2012L-120-X

 

 

C1, C2

Capacitors

Panasonic ECKDRS471, 470 pfd, 2600 VAC

 

 

J1

RJ11 Jack

Stewart SS6446NF

 

 

 

 

 

XECOM

(5)

XE5614L

XE5614L AT COMMANDS

Modes of Operation

The XE5614L uses "AT" commands for modem control and configuration. The XE5614L operates in three modes; Command Mode, Fax Mode and Data Mode. Extensions to the AT command set support fax operation.

Data Mode: The modem enters data mode after establishing a modem link and issues a "CONNECT" result code. In Data Mode the modem modulates all signals presented on Transmit Data, Pin 13, and sends them to the remote modem. The modem demodulates the signal from the remote modem and places it onto Received Data, Pin 3, for the host equipment. When the modem exits data mode, it issues a "NO CARRIER" result code.

Command Mode: The XE5614L enters command mode on application of power, reset, loss of the connection, or receipt of the escape sequence. In command mode the modem accepts commands from the host on Transmit Data. Appropriate result codes are returned on Received Data at the same speed and parity as the commands.

Fax Mode: The modem enters fax mode on receipt of the AT+FCLASS=1 command. Fax commands and responses are issued at 19,200 bits per second; the character format is 8 bits no parity. The modem accepts Class 1 Fax commands only in fax mode. The A/, ATO, AT&T and escape commands are not valid in fax mode.

Commands

The modem is configured and controlled with AT commands. AT commands follow a strict format. The command line is stored in the command buffer and executed upon receipt of a carriage return. Until executed, the command line can be edited with the backspace key.

Command Format - Each command, except A/, begins with the AT prefix. The "A" and "T" may be both upper case or both lower case but cannot be of different cases. The modem uses the prefix to identify the host's speed and parity. The modem determines speed by measuring the width of the incoming bits and parity by comparing the parity bits of the "A" and "T." The modem then returns result codes at the host's speed and parity.

Command Line - A command line may include multiple commands. The modem executes the commands in the sequence they appear in the command line. Spaces, inserted to improve legibility, do not fill space in the command buffer. A carriage return terminates the command line and causes the commands to be executed. Register S3 allows the user to select a character other than a carriage return to terminate the command line.

Command Buffer - The command buffer holds a maximum of 40 characters, including the AT prefix. If it overflows, the modem issues an "ERROR" result code and commands are not executed.

Command Line Editing - A backspace can be used to edit the command line any time before it is executed. The backspace character erases the previous character in the command line. Any character except for the "A" and "T" can be erased. Register S5 allows the user to select a character other than a backspace to edit the command line.

Re-Execute Last Command - The A/ command causes the XE5614L to re-execute the command line stored in the command buffer. This is the only command which does not require the "AT" prefix.

Omitted Parameters - Most commands include a parameter which determines the command function. When the parameter is omitted from the command string, it is assumed to be a 0.

Escape Characters - A three character escape sequence, entered while in data mode, will switch the modem into command mode while remaining on line. The escape character, set by Register S2, is entered 3 times in succession to execute the escape. The default escape sequence is "+++."

Result Codes - The modem issues a result code after each action. Result codes may be provided as full words, numeric codes or may be disabled. Each result code ends with a carriage return when numeric result codes are chosen. When full word result codes are chosen, a Line Feed and Carriage Return precede and follow each result code.

XECOM

(6)

XE5614L

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