XE232NET
Preliminary
June 2007
Low Cost Serial-to-Ethernet Bridge for Embedded Applications
Description
Features
The Xecom XE232NET Serial-to-Ethernet Bridge
modules provide a simple solution for connecting
TTL compatible serial interface;
micro-controller based embedded systems to a Local
Operates from a single +3.3 volt power supply
Area Network. These modules include all of the
Includes 10 Base-T Ethernet MAC and PHY
hardware and software needed to link the serial port
Embedded protocols include, Ethernet,TCP, IP, UDP,
on the micro-controller to the local area network.
ICMP, DHCP, ARP, HTTP, POP3, and SMTP
The XE232NET Serial-to-Ethernet bridge operates
Command and control with SerialAT Commands
much the same as any Xecom serial modem. AT
IEEE10BASE-Tcompatible
commands are used for control and configuration of
Models
The XE232NET. The XE232NET also utilizes the
XE232NET-1: Serial-to-Ethernet Bridge module with
same pin configuration as the Xecom XE5690SM
Ethernet isolation transformer included
modem family. This permits one design to support
XE232NET-2:Serial-to-EthernetBridgemodule
either Ethernet or dial-up modem connectivity with a
without isolation transformer.
simple module swap.
XE232NET-K: Ethernet Evaluation Kit includes
XE232NET-1; evaluation board, required cables, and
Xecom offers two versions of the XE232NET. The
power supply
XE232NET-1 with the Ethernet isolation transformer
XE232NET-1ITR:XE232NET-1withanoperating
and the XE232NET-2 without the isolation
range of -40C to +85C
transformer. An Evaluation Kit is available, model
XE232NET-2ITR:XE232NET-2withanoperating
number XE232NET-K
range of -40C to +85C
XE232NET Block Diagram
XECOM
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XE232NET
XE232NET Mechanical Specifications
Dim
Description
Inches
MM
a
Module Length
2.10
53.3
b
ModuleWidth
1.00
25.4
c
Module Height*
0.32
8.1
d
Total Pin Row Length
2.00
50.8
e
Pin 2 to Pin 3
1.50
38.1
f
Adjacent Pins
0.10
2.5
g
Pin 15 to Pin 16
0.90
22.9
h
Last Pin to edge
0.05
1.3
i
Pin Row to Pin Row
0.90
22.9
J
Pin Length
0.15
3.8
* Module Height with onboard transformer, XE232NET-1
Interface Pins are .025 inches square
XECOM
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XE232NET
XE232NETPinConfiguration
N/C
1
19
ETX+
N/C
2
18
ETX-
17
ERX+
16
ERX-
15
/VCC
14
/LS
13
/CTS
12
/DSR
11
/RTS
NACT
3
10
RXD
/Reset
4
9
TXD
N/C
5
8
/DTR
Gnd
6
7
N/C
Pin Descriptions
PIN NAME
DESCRIPTION
1
N/C
No Connection
2
N/C
No Connection
3
NACT
Network Activity is an active high output from the Ethernet bridge indicating that the
bridge is interacting with the network. NACT may be used to drive an LED to show
when the Ethernet link is active.
4
/Reset
Reset is an active low input to the XE232NET. A low on this pin initiates a hardware
reset. /RESET must be active for a minimum of 100 milliseconds to insure a proper
reset. No external reset is required. This pin should be left open if Reset is not to be
used.
5
N/C
No Connection
6
GND
Ground reference for the XE232NET
7
N/C
No Connection
8
/DTR
Data Terminal Ready input to the Ethernet Bridge. /DTR is an active low input
indicating the host equipment is ready to communicate.
9
/TXD
Transmit Data input from the local host equipment.
10
/RXD
Received Data Output from the XE232NET to the local host.
XECOM
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XE232NET
Pin Descriptions
PIN NAME
DESCRIPTION
11
/RTS
Request to Send input to the Ethernet Bridge. An active Request to Send input
indicates that the host equipment has information to send. Request to Send can also
be used for hardware Flow Control. When used for hardware Flow Control, the host
equipment turns Request to Send off to stop the flow of data from the XE232NET.
Data Flow is resumed when Request to Send is reactivated.
12
/DSR
Data Set Ready is an active low output from the Ethernet Bridge. Data Set Ready is
activated when the communications channel is available.
13
/CTS
Clear to Send is an active low output from the Ethernet Bridge. The XE232NET
activates Clear to Send to indicate to the host equipment that it is ready to transmit
data. When used as Hardware Flow Control, Request to Send is deactivated to stop
the flow of data from the host to the XE232NET to prevent data buffers from
overflowing. Data flow can resume when Clear to Send is reactivated.
14
/LS
Link Status is an active low output from the Ethernet Bridge. A low on this pin
indicates that the Ethernet link is active. This pin may be used to drive an LED to
display link status.
15
VCC
3.3 Volt power for the Ethernet Bridge module
16
ERX-
Ethernet Received Data Minus is the negative data input to the XE232NET module.
Note: XE232NET-2 does not include the isolation transformer. That 1500 volt
isolation barrier must be provided within the system.
17
ERX+
Ethernet Received Data Plus is the positive data input to the XE232NET module.
Note: XE232NET-2 does not include the isolation transformer. That 1500 volt
isolation barrier must be provided within the system.
18
ETX-
Ethernet Transmit Data Minus is the negative data output from the XE232NET
module. Note: XE232NET-2 does not include the isolation transformer. That 1500
volt isolation barrier must be provided within the system.
19
ETX+
Ethernet Transmit Data Plus is the positive data output from the XE232NET module.
Note: XE232NET-2 does not include the isolation transformer. That 1500 volt
isolation barrier must be provided within the system.
XECOM
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XE232NET
XE232NET Electrical Specifications
Parameter
Min
Typ
Max
Units
Comments
VCC
3.13
3.3
3.47
Volts
ICC
145
mA
On Line
0.35
mA
Sleep
Network Isolation
1500
VAC
XE232NET-1
Voh
2.4
5.0
Volts
Vol
0.4
Volts
Vih
2.0
5.0
Volts
Vil
-0.3
0.8
Volts
XE232NET ABSOLUTE MAXIMUM RATINGS
Storage Temperature
-25 O C to +85 O C
1 Maximum Operating Temperature Range
0 O C to +70 O C
VCC
3.6 Volts
1 The XE232NET can be ordered with an Operating Temperature of -40 O C to +85 O C at extra cost.
Order XE232NET-1ITR or XE232NET-2ITR to specify Industrial Temperature Range (ITR).
XECOM
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XE232NET
XE232NET-1 Typical Connection Diagram
Notes:
TheEthernettransformerisincludedontheXE232NET-1module.
Fuses F1 and F2 protect against a power line cross with the network cable. Xecom recommends the
Littlefuse0461_1.25forthisfunction
XECOM
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XE232NET
XE232NET-2 Typical Connection Diagram
Notes:
Fuses F1 and F2 protect against a power line cross with the network cable. Xecom recommends the
Littlefuse0461_1.25forthisfunction
TransformerT1isincludedontheXE232NET-1module. FortheXE232NET-2Xecomrecommends
theDeltaElectronicsLF8505EthernetTransformer.
L1 is a Ferrite Bead for EMI Suppression.
XECOM
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XE232NET
XE232NET AT Commands
The XE232NET uses "AT" commands for
Omitted Parameters - Most commands include a
configuration and control. This section describes the
parameter which determines how the functions will
AT command format and lists the commands,
be set. When the command parameter is omitted
registers and result codes.
from the command string, it is assumed to be a 0.
Command Mode: XE232NET enters command
Escape Characters - A 3 character escape
mode on power-up, reset, a lost connection, or
sequence may be entered to switch the modem into
receipt of the escape code. In command mode the
command mode while on line.
The escape
modem accepts commands from the host on
character, set by Register S2, must be entered 3
transmit data. Appropriate result codes are returned
times in succession to execute the escape. An AT
on received data.
command must then be entered within the period
defined by S12 to enter command mode.
The
Command Line Format
default escape sequence is "~~~"
AT commands follow a strict format. Each
command line, except A/, begins with the prefix
Result Codes - The Ethernet Bridge issues a result
AT. The "A" and "T" may be both upper case or
code after each action. Result codes may be sent as
both lower case but cannot be of different cases.
full words, one or two digit numeric codes, or may
be disabled all together. Each result code ends with
Multiple commands may be combined into a single
a carriage return when numeric result codes are
command line of up to 48 characters. Commands
chosen. When full word result codes are chosen, a
are executed in the sequence they appear upon
Line Feed and Carriage Return precede and follow
receipt of a carriage return. Spaces inserted into the
each result code.
command line are not placed in the buffer.
Email Modes: The XE232NET can transfer
The command line can be edited with a backspace
information as an Email from either of two Email
before it is executed. The backspace erases the
modes, transmit and receive. Once Email uploading
previous character in the command line. Register S5
or downloading is complete the escape sequence,
allows the user to select a character other than
default "~~~", terminates Email mode.
backspace to edit the command line.
Transmit Email mode is accessed with the AT+ET:n
If the command buffer overflows, the modem issues
command. Where “n” represents the destination
an "ERROR" result code, and the command line is
Email address. Upon receipt of this command the
not executed. Register S3 allows the user to select
XE232NET logs into the Email Server and any data
a character other than a carriage return to terminate
placed on TXD will be transferred to the destination
the command line.
address as Email.
Re-Execute Last Command - The A/ command
TheAT+ER command causes the XE232NET to log
causes the modem to re-execute the last command
into the Email server and look for incoming Emails.
line. This is the only command which does not
Data from these received emails wil be presented
require the "AT" prefix.
on the RXD output.
XECOM
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XE232NET
XE232NET AT Commands
ATDa Send a message to Destination Address a
AT\Pn Command Parity (whenATB2 orATB5 is
within the local group.
selected)
ATDw.x.y.z Send mesage to the IP address, w.x.y.z
n=0 even parity
n=1 odd parity
ATD:d Connect with listed domain name
n=2 Mark Parity *
ATEn Command Echo
AT\Qn Terminal to adapter Flow Control;
n=0 Do not echo commands
n=0 none
n=1 Echo commands to the system host.*
n=3 Hardware (RTS/CTS)
n=4 Software (XON/XOFF)
ATIn Module Identification codes
n=0 Respond with Model Number
AT\Tn DTE interface Speed
n=1 Respond with Code Revision & Date
n=6 9600 bps
n=9 19,200 bps *
ATQn Select Response Type
n=10 38,400 bps
n=0 Full Word Responses (includes a
n=11 57,600 bps
carriage return and linefeed before and
n=12 115,200 bps
after each response)*
n=13 230,400 bps
n=1 Single Character Responses (includes
a carriage return after the response)
AT+D=mm,dd,yy Set Date
n=2 No responses
mm= month
dd= day
ATZ Initiate a soft Reset
yy= year
AT&Cn This command controls the operation of
AT+ER: Causes the XE232NET to log into the
the Line Status indicator /LS
Email serverand download messages.
n=0 /LS always active
n=1 /LS active when the Ethernet Link is
AT+ET:n Causes the XE232NET tosend data in
available *
Email form to address n.
AT&Dn Response to deactivation of /DTR
AT+Pn Password Requirement
n=0 Ignore /DTR
n=0 No Password required
n=1 Drop Ethernet Link if DTR inactive *
n=1 Password required to connect
AT&F Return to factory Default settings
AT+T=hh,mm,ss,n Set Time
hh= hour
AT&V Display active configuration
mm= minute
AT\Bn Character format for commands
ss= second
n=1 7N1; 7 data bits, no parity, one stop bit
yy= year
n=2 7P1; 7 data bits, one parity bit, one
n= a for AM or P for PM
stop bit
n=3 8N1; 8 data bits, no parity, one stop bit
n=5 8P1; 8 data bits, one parity bit, one
stop bit *
XECOM
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XE232NET
XE232NET Registers
S1
Automatically connect to network: S0=1 S14
Sleep Inactivity Timer: S14 sets the length of
sets the ethernet bridge to automatically
inactivity before the Ethernet Bridge enters
complete a network connection. .
sleep mode. Zero disables sleep mode.
Range: 0 to 255
S2
Escape Character:
S2 sets the ASCII
Units: Seconds
escape character.
Values of 0-127 select
Default: 0
valid characters; values from 128 to 255
disable the escape sequence.
S99 DHCP Client: S99 Determines if DHCP
Range:
0 to 255
(Dynamic Host Configuration Protocol) will be
Units
ASCII Character
active.
Default
126 (~)
Range: 0 to 1
Setting:
0 = DHCP Disabled
S3
Line
Termination
Character:
S3
1 = DHCP Enabled
determines the ASCII character which will
Default: 1
terminate commands and modem responses.
Range:
0 to 127
S100 Network Port Number: S100 sets the port
Units
ASCII Character
number of the XE232NET for the local
Default
13 (Carriage Return)
network.
Range: 0-65535
S4
Line Feed Character: S4 sets the ASCII
Default: 0
character to act as a line feed character in
modem responses.
S101 Set IP Address: S101 sets the IP Address of
Range:
0 to 127
the XE232NET. Note when DHCP is selected
Units
ASCII Character
and the XE232NET is connected to a DHCP
Default
10 (Line Feed)
server the IP Address does not need to be set
manually.
S5
Backspace Character:
S5 defines the
Format: www.xxx.y.z
ASCII character used as a backspace to edit
the command line.
S102 Set Network Mask: S102 sets the Network
Range:
0 to 127
Mask of the XE232NET. Note when DHCP is
Units
ASCII Character
selected and the XE232NET is connected to a
Default
8 (Back Space)
DHCP server the Network Mask does not need
to be set manually.
S12 Escape Code Guard Timer: S12 sets the
Format: www.xxx.yyy.z
escape sequence guard timer. If characters
are received before or after the escape S103 Set Network Gateway: S103 selects the
sequence, within the guard timer, the modem
Network Gateway for the XE232NET. Note
aborts the escape and remains in data mode.
when DHCP is selected and the XE232NET is
Range:
10 to 255
connected to a DHCP server the Network
Units
0.02 Seconds
Gateway does not need to be set manually.
Default
50
Format: www.xxx.yyy.z
XECOM
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XE232NET
XE232NET Registers
S104 Set DNS IP Address: S103 selects the
Domain Name Server Address for the
XE232NET. Note when DHCP is selected
and the XE232NET is connected to a DHCP
server the Domain Name Server Address
does not need to be set manually.
Format: www.xxx.yyy.z
S105 Set User Name: S105 stores the User
Name for the XE232NET. The User Name
may be up to 8 ASCII characters. The
default User Name is “USER”. The User
Name is not reset with the AT&F command
S106 Set Password: S106 stores the password
for the XE232NET. The password may be
up to 8 ASCII characters. The default
Password is “PASSWORD”. The password
is not reset with the AT&F command.
XE232NET Registers
Digits
Verbose
Description
0
OK
Command Successful
1
CONNECT
300 bps or higher connection
3
NO CARRIER
Link not detected
4
ERROR
Error in command line
XECOM
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XE232NET
Terms of Sale
Devices sold by XECOM are covered by the warranty provisions appearing in its Terms of Sale only. XECOM makes no war-
ranty, express, statutory, implied, or by description regarding the information set forth herein, or regarding the freedom of the de-
scribed devices from patent infringement. XECOM makes no warranty of merchantability or fitness for any purposes.
XECOM reserves the right to discontinue production and change specifications and prices at any time and without notice. This
product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual envi-
ronmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment, are
specifically not recommended without additional processing and authorization by XECOM for such application.
Xecom assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xecom product. No other cir-
cuits, patents, or licenses are implied.
Life Support Policy
Xecom's products are not authorized for use as Critical Components in Life Support Devices or Systems.
Life Support Devices or Systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) sup-
port or sustain life, and whose failure to perform, when properly used in accordance with instructions provided in the labeling,
can be reasonably expected to result in significant injury to the user.
A Critical Component is any component of a life support device or system whose failure to perform can be reasonably ex-
pected to cause failure of the life support device or system, or to affect its safety or effectiveness.
Copyright, Xecom © 2007
While Xecom, Inc. has made every effort to ensure that the information presented here is accurate, Xecom will not be liable for any damages arising from errors or
omission of fact. Xecom reserves the right to modify specifications and/or prices without notice. Product mentioned herein are used for identification purposes
only and may be trademarks and/or registered trademarks of their respective companies.
Xecom Incorporated
374 Turquoise Street, Milpitas, CA 95035
Ph:408-942-2200
Fax:408-942-1346
E-Mail: info@xecom.com
XECOM
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XE232NET