XECOM XE924 Datasheet
XECOM (1) XE924
XE924
October 2002
XE924 Base Access Point for Multiple Remote Machines
Description
Xecom combined proven embedded modem technology
and a 900 MHz transceiver to create the XE924, Base
Access Point. The Base Access Point is a simple scheme
to connect multiple remote systems to a single dial-up
telephone line. Each of the remote systems
communicates with the Base Access Point using
Xecom’s XE900 Smart Transceiver. The XE924
eliminates hardware redundancy, and therefore reduces
both the initial investment and operating costs.
Xecom’s Base Access Networking scheme significantly
reduces hardware costs in locations with multiple
systems. For example, credit card verification normally
requires a dedicated modem and telephone line for each
sales terminal. Each time a terminal is added another
modem and another telephone line also need to be added.
The Base Access Point connects all of the terminals
through one shared modem and telephone line. The
only hardware requirement is the addition of an XE900
Smart Transceiver to the terminal equipment.
This scheme also eliminates the installation requirements
of a wired network. Whether you add a system equipped
with a Smart Transceiver to the network or build a new
facility, the 900 MHz wireless link eliminates the need to
install cables and configure a server. By virtue of its
commonality with millions of cordless telephones the
XE924 also offers the most cost effective wireless link
available.
The XE924 reduces hardware costs in multiple
system environments. Systems which now require a
dedicated modem and telephone line for each unit
can be connected through the shared modem and
telephone line.
Features
* Small Size: 2.75” by 1.38: by 0.55”
* Access to the telephone network for up to 8
machines equipped with Xecom’s XE900 Smart
Transceiver.
* Telephone Modem Data Transfer at 300, 1200, and
2400 BPS
* Telephone Modem Control and Configuration via
industry standard AT Commands.
* Wireless Carrier Frequency 916.48 MHz on ISM
Band
* Wireless Range; maximum 150 Feet indoors
* Wireless Data Rate 9600 BPS, half-duplex
* Integrated communications controller regulates the
wireless communications protocols, error
correction and controls the wireless link to the
modem.
* In circuit upgradeable firmware
* User Transferrable FCC Part 68 Registration
* FCC Part 15 Compliance
Preliminary
System A
XE900
Equipped
XE924
Base Access
Point
Dial-up
Telephone
Line
System B
XE900
Equipped
System C
XE900
Equipped
900MHz Base Access Network
XECOM (2) XE924
XE924 MECHANICAL SPECIFICA TIONS
Inches MM
PIN MIN MAX MIN MAX
A 2.740 2.760 69.60 70.10
B 0.550 0.560 13.97 14.22
C 1.370 1.390 34.80 35.31
D 5.300 0.510 13.46 12.95
E 2.490 2.510 63.25 63.37
F 0.090 0.110 2.29 2.79
G 0.115 0.135 2.92 3.43
H 1.190 1.210 30.23 30.73
J 0.130 0.150 3.30 3.81
K 0.220 0.240 5.59 6.10
L 0.300 0.320 7.62 8.13
Pin Description:
Pins are gold plated
Pin Dimensions .025 inches square, .minimum 0.120 inches long
A
B
C
D
E
FG
H
J
K
L
(Top View)
Pin 1
XECOM (3) XE924
XE924 PIN CONFIGURATION
XE924 BLOCK DIAGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
28
27
XE924
RGND
RESERVED
RGND
RESERVED
RGND
RESERVED
RGND
RESERVED
RGND
RGND
RESERVED
RESERVED
RESERVED
VDD
DGND
/RST_VPP
VCC
RA3
/DSR
/MDM_DSR
RXD
/MDM_RXD
TXD
/MDM_TXD
/RI
/MDM_RI
RGND
RESERVED
RGND
RESERVED
RGND
RESERVED
RGND
RESERVED
RGND
RGND
RF_PDN
RF_TXDATA
RF_RXDATA
RGND
/CTS
/MDM_CTS
/DCD
/MDM_DCD
/DTR
/MDM_DTR
/RTS
RESERVED
RESERVED
TIP
RING
Comm
Controller
ROM
2400 BPS
MODEM
Tip
Ring
900 MHz
Transceiver
Antenna
Modem
Serial IF
Communications
Controller
Serial IF
XECOM (4) XE924
XE924 PIN CONFIGURATION
SIGNAL PINS DESCRIPTION
RGND 1, 3, 5, 7, 9, 10, RFGND provides the common reference point for all high
39, 43, 44, 46, frequency signals.
48, 50, 52
RESERVED 2, 4, 6, 8, 11,12, These pins are reserved for future use. No connections
13, 30, 31, 45 should be made to these pins.
47, 49,51
VDD 14 VDD provides power to the 900 MHz transceiver.
DGND 15 DGND provides the ground reference for the modem and
communications controller circuitry in the XE924.
/RST_VPP 16 RST_PV provides a hardware reset line for the XE924’s
communications controller.
VCC 17 VCC provides power to the communications controller and
modem circuitry.
RA3 18 Programmable I/O pin from the embedded communications
controller.
/DSR 19 /DSR is the Data Set Ready input to the communications
controller. This pin is normally tied to /MDSR, pin 20
/MDSR 20 /MDSR supplies the Data Set Ready output from the modem.
/MDSR is an active low output. This pin is normally tied to
/DSR, pin 19.
RXD 21 RXD is the serial data input to the communications controller.
This pin is normally tied to /MRXD, pin 22.
/MRXD 22 /MRXD is the serial data output from the modem in the
XE924. A Mark condition on /MRXD is active low. This pin
is normally tied to RXD, pin 21.
TXD 23 TXD is the serial data output from the communications
controller. It is normally tied to /MTXD, pin 24
/MTXD 24 /MTXD is the serial data input to the modem in the XE924. A
Mark condition on /MRXD is active low. TXD is normally tied
to /MTXD, pin 23
/RI 25 /RI provides the Ring Indication input to the communications
controller. /RI is normally tied to Pin 26
XECOM (5) XE924
/MRI 26 /MRI supplies the Ring Indication output from the embedded
modem in the XE924. /MRI is active low. /MRI is normally
tied to Pin 26
RING 27 The Ring and Tip signals provide the connection from the XE924 to
the telephone line. FCC Part 68 Rules require a 1500 volt isolation
barrier between the telephone line and all other circuits. This isolation
must be preserved throughout the system.
UL60950 requires minimum creepage and clearances distances be
maintained between the Tip and Ring traces and all other circuits.
Clearance is the shortest distance between conductive circuits; creepage
is the distance between conductive surfaces along the surface.
TIP 28 The Ring and Tip signals provide the connection from the XE924 to the
telephone line. FCC Part 68 Rules require a 1500 volt isolation barrier
between the telephone line and all other circuits. This isolation must be
preserved throughout the system.
UL60950 requires minimum creepage and clearances distances be
maintained between the Tip and Ring traces and all other circuits.
Clearance is the shortest distance between conductive circuits; creepage
is the distance between conductive surfaces along the surface.
NO PIN 29 This pin is intentionally removed to improve the isolation from
the local telephone line.
RTS 32 /RTS supplies the Request to Send out put from the communi-
cations controller. /RTS is an active low output.
/MDTR 33 /MDTR connects to the modems Data terminal Ready line. It
is an active low input to the XE924. /MDTR is normally tied to
/DTR, pin 34.
/DTR 34 /DTR provides the Data Terminal Ready output from the
communications controller. /DTR is normally tied to /MDTR,
pin 33. This is an active low output.
/MDCD 35 /MDCD provides the Data Carrier Detect output from the
modem inside XE924. This is an active low output. /MDCD is
normally tied to /DCD, pin 36.
/DCD 36 /DCD is the Data Carrier detect input to the communications
controller. /DCD is normally tied to /MDCD, pin 35.
XE924 PIN CONFIGURATION
XECOM (6) XE924
XE924 PIN CONFIGURATION
/MCTS 37 /MCTS provides the Clear to Send output from the modem
inside XE924. This is an active low output. /MCTS is normally tied to /CTS, pin 38.
/CTS 38 /CTS is the Clear to Send input to the XE924 communications
controller. /CTS is normally tied to Pin 37.
RF_RXDATA 40 RF_RXDATA serial data output from the 900 MHz transceiver
in the XE924. A Mark condition on RF_
RF_TXDATA 41 RF_TXDATA is the signal input to the 900 MHz transceiver in
the XE924. A Mark condition on RF_TXDATA is active high.
RF_TXDATA is normally tied to pin 12.
RF_PDN 42 RF_PDN placed the XE924’s 900 MHz transceiver into sleep
mode to reduce power consumption when not in use. It is an
active high signal. RF_PDN is normally tied Pin 11.
ABSOLUTE MAXIMUM RATINGS
Storage Temperature -25O C to +85O C
Operating Temperature Range
1
0O C to +70O C
1
Units may be screened for operation from -40 to +85C. An extra charge will be applied for this screening.
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