Rice Lake AirStream User manual

63108
AirStream
™
Wireless Modem
Operation
Manual

i
Chapter 1: Overview1.........................................................................................1
Why Wireless? ....................................................................................................1
AirStream Technology ........................................................................................................2
Frequency Hopping .................................................................................................................. 3
Speed and Bandwidth ............................................................................................................. 3
Sessions and Links................................................................................................................... 4
Error Detection and Correction .................................................................................................4
Transmit Power Control ............................................................................................................ 5
Data Transfer Sessions ............................................................................................................ 5
Security.............................................................................................................................. 6
Transceiver Features ..........................................................................................................6
Using This Manual ............................................................................................................. 7
Assumptions ....................................................................................................................... 8
Getting Help........................................................................................................................ 8
Chapter 2: Installation and Specifications ....................................................9
Hardware Installation ........................................................................................................ 9
Installing Stand-alone Transceivers .........................................................................................9
Interface Requirements .................................................................................................. 11
Stand-alone Transceiver Pin Out .............................................................................................12
Serial Communications ................................................................................................... 13
Hardware Specifications .................................................................................................15
Software Requirements ...................................................................................................16
Software Installation ........................................................................................................ 16
Configuration Manager ............................................................................................................16
Network Software Utilities ....................................................................................................... 17
Antennas ...........................................................................................................................17
Chapter 3: Point to Point and Network Topologies .....................................19
Point to Point Pair.............................................................................................................19
Networks ..........................................................................................................................19
Multi-Point Network ................................................................................................................ 20
Repeater Network ...................................................................................................................20
Broadcast Network................................................................................................................. 22
Network Software Utilities ...............................................................................................23
Copyright © 2002 Rice Lake Weighing Systems. All rights reserved. Printed in the United States of America.
Specifications subject to change without notice.
February 2002
Contents

ii
ComPort Intercept ..................................................................................................................23
TCP/IP Intercept .....................................................................................................................24
ActiveX Library ........................................................................................................................24
DOS Library............................................................................................................................ 24
Chapter 4: Configuring Your Transceiver ........................................................ 25
Getting Status ..................................................................................................................26
The Toolbar ...................................................................................................................... 27
Exiting the program .......................................................................................................... 27
Quick Configuration ................................................................................................... 27
Modifying Settings ..................................................................................................... 31
Applying and Storing Changes......................................................................................... 31
Generating Reports ....................................................................................................32
Power Management................................................................................................... 34
Passwords and Access............................................................................................... 36
Levels Of Access .............................................................................................................36
Passwords .......................................................................................................................36
Using Hop Tables......................................................................................................... 37
Entering Hop Table Numbers ...........................................................................................37
Validating the Hop Table.................................................................................................. 38
Specifying Hopping Parameters ....................................................................................... 38
Assigning IDs.............................................................................................................. 39
Signal Analysis .......................................................................................................... 41
Serial Settings ............................................................................................................ 41
Data Threshold ...........................................................................................................43
Chapter 5: Setting up a Network with ComPort ..............................................45
ComPort Configurator ................................................................................................ 46
Advanced View ................................................................................................................48
Entering and Changing Information ..................................................................................48
Adding Virtual Ports ......................................................................................................... 48
Setting Control Line Parameters .......................................................................................51
Tx Purge........................................................................................................................... 51
Remove Unit ID Number .................................................................................................. 52
Remove Virtual Communications Port............................................................................... 53
Renaming Virtual Ports ..................................................................................................... 53
Using ComPort Activator............................................................................................ 53
ComPort Activator ............................................................................................................54

iii
Chapter 6: Setting up a Network with TCP/IP .............................................. 55
TCP/IP Configurator .......................................................................................................... 56
Advanced View....................................................................................................................... 57
Entering and Changing Information ......................................................................................... 58
Adding TCP/IP Ports ...............................................................................................................58
Editing Ports ...........................................................................................................................60
Setting Control Line Parameters.............................................................................................. 61
Remove Unit ID Number .........................................................................................................61
Remove TCP/IP COM Port ......................................................................................................62
Renaming TCP/IP Ports ..........................................................................................................62
Monitoring Activity ...........................................................................................................62
Using TCP/IP Activator..................................................................................................... 64
TCP/IP Activator ..................................................................................................................... 64
Chapter 7: ActiveX Network Applications 67
wCi_OPEN ........................................................................................................................67
wCi_Close ........................................................................................................................68
wCi_WriteDataEx .............................................................................................................68
wCi_GetDestinationID ......................................................................................................69
wCi_CheckRxQue .............................................................................................................69
wCi_SetOutputDeviceID ...................................................................................................69
wCi_StartStopPrinting ......................................................................................................70
wCi_GetSourceID .............................................................................................................70
wCi_SetGpioOutput ..........................................................................................................71
wCi_GetGpioOutput ..........................................................................................................71
wCi_GetGpioInput ............................................................................................................72
wCi_GetGpioMode ............................................................................................................72
wCi_Ping ..........................................................................................................................73
AboutBox ..........................................................................................................................73
NewMessage..................................................................................................................... 73
ActiveX Design Time Properties Page:............................................................................ 74
Chapter 8: Testing Your Units .......................................................................75
Terminal Mode Test .........................................................................................................75
What You Need .......................................................................................................................75
Performing the Test................................................................................................................. 76
Loopback Test ..................................................................................................................76
What You Need....................................................................................................................... 77
Performing the Test ................................................................................................................77
Viewing Data In The Rx And Tx Panes ....................................................................................79

iv
Using Hyperterminal ...............................................................................................................80
Chapter 9: Troubleshooting.............................................................................. 81
Chapter 10: Learning Exercises....................................................................... 83
Point to Point .............................................................................................................. 83
Materials Needed ............................................................................................................. 83
Procedure........................................................................................................................ 83
Multi-Point ComPort Intercept................................................................................... 86
Materials Needed ............................................................................................................. 86
Procedure........................................................................................................................ 86
Multi-Point TCP/IP Intercept ...................................................................................... 91
Materials Needed.............................................................................................................. 91
Procedure ........................................................................................................................91
Repeater TCP/IP Intercept ......................................................................................... 95
Materials Needed ............................................................................................................. 95
Procedure ........................................................................................................................95
Broadcast Remote-To-All .........................................................................................100
Materials Needed........................................................................................................... 100
Procedure ......................................................................................................................100
Broadcast Remote-To-Host ...................................................................................... 104
Materials Needed ........................................................................................................... 104
Procedure ......................................................................................................................104
Glossary...........................................................................................................109
Warranty ..........................................................................................................110

1
1
AirStream User’s Manual
Chapter 1: Overview
Welcome to the AirStream
™
family of wireless
Transceivers. These frequency hopping transceivers
are supplied as a Stand-alone Transceiver that plugs
into the RS232 port of an existing product and can be
used to create wireless data networks in the license-
free band at 2.4 GHz. AirStream Transceivers can
function in a wide array of network topologies. This
manual provides the information you need to install,
configure, and test this transceiver in a variety of
these networks.
WHY WIRELESS?
AirStream Transceivers provide the first practical and
affordable alternative to wire for industrial and
commercial applications where data must be
transmitted reliably and securely in a wide range of
indoor and outdoor environments.These applications
are solutions for OEMs and Systems Integrators in
need of reliable, secure, long-range, and low-cost
alternatives to wire for commercial and industrial
applications. There are hundreds of factory, office,
industrial, transportation, medical, financial, and
retail applications for which AirStream solutions are
ideally suited.
Wireless data connectivity offers many advantages
over wire:
•Wireless systems are easier to install
•Wireless system installation and maintenance
costs are lower
•Wireless links are feasible in many locations
where wire is not
•Wireless installations can be reconfigured or
relocated easily
•Wireless products are mobile
In this Chapter
•Why Wireless
•AirStream
Technology
•Frequency
Hopping
•Security
•Transceiver
Features
•Assumptions
•Using this
Manual
•Getting Help

AirStream Technology
Overview
2
AirStream User’s Manual
Reliability, security, range, and cost have been the traditional obstacles to
widespread adoption of wireless data networks. But today frequency
hopping technology provides reliability comparable to and security
greater than wire.AirStream Transceivers have been designed specifically
for long range and low cost. Moreover, the license-free band at 2.4GHz
allows wireless data connectivity solutions to be implemented without
site licenses or carrier fees. These developments make wireless data
networks more practical and affordable than wire for many applications.
AirStream wireless data connectivity solutions are more reliable, more
secure, longer range, and lower cost than wire:
•More Reliable
AirStream Transceivers evaluated with industry standard test
equipment have exceeded a bit error rate (BER) standard 100 times
more rigorous than for 10 BaseT Ethernet and 1,000 times more
reliably than cellular devices.
•More Secure
AirStream Transceivers utilize frequency hopping technology
developed by the military and refined by intelligence agencies to
avoid interception and interference. It is more difficult to intercept
communications between AirStream wireless devices than to tap a
wire.
•Longer Range
AirStream Transceivers operate through walls and floors up to 1,500
feet in most buildings, and line-of-sight to the horizon outdoors. For
longer distances, networks of AirStream Transceivers can relay data
packets to and from out-of-range devices to significantly extend the
range of a wireless data network.
•Lower Cost
Wireless devices are installed at prices that can be a fraction of the
cost of wires. AirStream devices can be moved or reconfigured at no
additional cost.
AIRSTREAMTECHNOLOGY
AirStream uses Frequency Hopping Spread Spectrum (FHSS) technology
to ensure secure, reliable long-range data transmissions. AirStream
utilizes this proven technology to provide OEMs and Systems Integrators
with a superior wireless data connectivity solution for many industrial and
commercial applications.

AirStream Technology
Overview
3
AirStream User’s Manual
Frequency Hopping
Frequency Hopping Spread Spectrum technology was developed by the
U.S. military to prevent interference or interception of radio transmissions
on the battlefield. Frequency hopping devices concentrate their full power
into a very narrow signal and randomly hop from one frequency to
another within that spectrum up to 200 times per second. If they
encounter interference on a particular frequency, the devices retain the
affected data, randomly hop to another point on the spectrum, and
continue transmission. There are always spaces without interference
somewhere in the allotted radio spectrum. A frequency hopping device
will find those spaces and complete a transmission where other wireless
technologies fail.
AirStream Transceivers operate in the license-free Industrial, Scientific,
and Medical (ISM) band at 2.4GHz. No one owns or licenses these
frequency bands. Consequently, anyone may operate a wireless network
in a license-free band without licenses or carrier fees (unlike cellular
technology), subject only to restrictions on how much power can be used
(1 watt or less in the U.S.) and the type of radio signals transmitted
(spread spectrum). The U.S. FCC and telecommunications regulators in
many countries have designated this band for low-power license-free use.
Speed and Bandwidth
There is a common misconception regarding speed and data connectivity;
specifically, that faster is better. In computer and telecommunications
networks, higher speeds are unquestionably superior. However, this is not
the case with wireless data connectivity. There are many circumstances
where range, in-building penetration, and reliability are more important
than speed.
Paying for more speed than what is necessary to implement a data
connectivity application is not efficient. The broader radio frequency (RF)
bandwidth needed to transmit higher data rates dramatically reduces
range. In contrast, the lower data rates used by AirStream allow narrow
bandwidths to be used. This is ideal for intermittent, repetitive data
transfer, where the premium is on accuracy and long-range transmission.
AirStream products have been designed specifically to meet the
requirements of such applications. A lower data rate enables AirStream
Transceivers to operate within a narrow RF band over significantly longer
ranges than other 2.4 GHz Frequency Hopping or Direct Sequence Spread
Spectrum (DSSS) products.
...
..
..
.
..
...
..
.
..
2.483
2.4
Interference
Transmitting
Transceiver
Receiving
Transceiver

AirStream Technology
Overview
4
AirStream User’s Manual
Sessions and Links
AirStream Transceivers use demand-based frequency hopping where RF
is only transmitted when there is data available to transmit. The initiating
transceiver is termed the master and the receiving transceiver is called the
slave. Any device (host or remote transceiver) can be a master or a slave
depending on who initiates the data transfer. AirStream Transceivers
transmit data using sessions and links. A session represents a complete
data transfer cycle between two devices. The session lasts as long as it
takes to transfer all of the data being sent.A session can be comprised of a
number of links which represent the actual transfer of data between two
devices. Radio interference can break a link but not end a session. It may
take several links to complete a session. If a link is broken, it is the job of
the master to reinitiate the link in order to complete the session. This
strategy reduces the collision rate of packets and RF interference from
adjacent devices.
Data going in and out of the transceiver via the serial port is (or can be) a
continuous stream of information; whereas, data transmitted over the air
is broken into frames. Links consist of these frames. The frame represents
the physical data packet transmitted per hop between units.
The transceiver’s channel access (communications link) is based on the
Carrier Sense Multiple Access (CSMA) protocol. This protocol has the
advantage of requiring no special coordination between remotes and
works best with a large or variable number of remotes transmitting
infrequent bursts of data. Channel latency is exponentially distributed,
meaning there is a wait cycle during interference. During interference,
data is hopped to another frequency. Although there is a slight delay
during each hop, data is not lost.
Error Detection and Correction
AirStream Transceivers provide CRC error correction, forward error
correction, and transmission retry to ensure complete transmissions, even
in the most demanding circumstances.
The transceiver uses the ITU cyclical redundancy code 16 (CRC-16) for
error detection. Two separate CRC-16 checks are used within each packet
frame:
•Header Section
•Data Section

AirStream Technology
Overview
5
AirStream User’s Manual
Most wireless systems experience single bit errors as the most common
type of reception error. Forward Error Correction (FEC) can be used to
correct for a specific number of bit errors within x -number of bits
transmitted. AirStream uses a ‘Half Rate Coding’algorithm which
achieves a correction rate of 1 bit-error in 4 bits transmitted.
The transceiver maintains data integrity over the air by means of an
internal automatic-repeat-request (ARQ) protocol, which will resend
erroneous data until it is received correctly. The transceiver takes user
data and breaks it into packets which are then transmitted at a much
higher channel data rate. If the received packet has errors and is not
correctable via the forward-error-correction (FEC) algorithm, the packet
is rejected and resent until a valid packet is received. The transceiver
maintains two 4kB buffers (transmit and receive) which helps to support
continuous uninterrupted transfers even in noisy situations. See Broadcast
Network on page 22 for details on how Broadcast Network behavior
differs.
Transmit Power Control
Wireless devices in close proximity often experience desensing or over-
loading. AirStream Transceivers minimize this problem by providing
adjustments in the Power Level Feed-Back Control Loop based on the
time-averaged Received Signal Strength Indicator (RSSI) values and the
Actual Power Level Setting as shared between both devices during a
communication session.
DataTransfer Sessions
All units are in one of six possible sequential modes or phases of
operation which cover the complete cycle of data transfer.
1. Idle
Unit listens and scans in each of the 75 channels in the hop table. No
activity.
2. Link Acquisition
Data is present locally, unit begins to ping (search) each frequency in hop
table to find the remote unit.
3. Synchronization
Units on both ends of data transfer synchronize their hopping patterns.

Security
Overview
6
AirStream User’s Manual
4. Data Transfer
In-sync units each alternate transmitting and receiving data in 32msec
intervals (32msec Tx, 32msec Rx). Each 64 msec they hop to the next
frequency.
5. Exit Phase
Data transfer is complete based upon the setting for number of frames of
No Data specified in the transceiver’s configuration.
6. End Connection
Data transfer is complete, units return to Idle mode.
SECURITY
Frequency hopping is inherently more secure than other RF technologies.
In addition, each AirStream Transceiver has a Vendor ID set in the
firmware shipped straight from the factory. As you configure each
transceiver you may provide additional network ID numbers and assign
varying hop tables for independent networks. The combination of
firmware, software IDs, and frequency hopping technology ensures safe
and secure data transmissions. AirStream Transceivers also support your
data encryption software.
TRANSCEIVER FEATURES
AirStream Transceivers enable OEMs and Systems Integrators to
integrate license-free 2.4GHz frequency hopping technology into their
own products. Each transceiver includes a proprietary RF module with a
frequency hopping transmitter and receiver, a Digital Control Module for
RF Module andApplication Interface management, and an interface (TTL
or RS232) designed to communicate with a variety of products. The
AirStream Transceivers employ a wireless interface designed to function
as a virtual wire replacement.This offers some distinct advantages over
wire. AirStream Transceivers:
•Enable mobility that may not have been possible before.And using
either the RS232 or RS485 serial connection, the transceivers can
connect devices at long range—up to 1500 feet indoors, and line of
sight to the horizon.
•Compensate for baud rate differences between devices, eliminating
the need for converters between older, slower devices and newer,
somewhat faster ones.

Using This Manual
Overview
7
AirStream User’s Manual
•Provide a GPIO (General Purpose Input/Output) mode for enabling
communication of status and control information in addition to data.
This ensures timely notification of state changes such as an “out of
paper” indication, eliminating the need for time-consuming manual
checking for such conditions.
•Provide both Software and Hardware Flow Control to enable pacing
of data transmission between devices.
•Enable efficient timed or batched transmission of data through data
thresholding capabilities.
•Provide power control modes for power conservation.
•Provide asymmetrical data rates to accommodate large directional
data transfers.
•Provide the configurabilitiy to support a variety of network topologies.
•Can be upgraded in the field.
USINGTHIS MANUAL
All AirStream software applications are Windows® based and adhere to
Windows software conventions.
The conventions used for instructions in this manual are as follows:
Convention Definition
bold
Bold is used to indicate something that should be typed exactly or an exact
duplication of a window name or button.
click Click with the button on the mouse and release. Left button always implied on
Windows.
Control-e Hold down the Control key and press the E key.
double-click Click two times quickly on the mouse button and release.
right-click Click with the right button on the mouse and release.
select This can mean to highlight (which is the action of changing a screen object’s
attribute to have an inverted look on the screen) icons or list items by clicking
or by clicking a menu item and dragging the cursor over its options to choose
that option or sub-item.
Shift-click Hold down the Shift key and click.

Assumptions
Overview
8
AirStream User’s Manual
ASSUMPTIONS
It is assumed that you are familiar with your Windows operating system.
It is also assumed that your Windows operating system is operating in
default mode (e.g., double-click to open). All instructions in this manual
assume default mode (as delivered) operation.
GETTING HELP
Each software program has on-line help accessible through the help menu
within the program. For Technical Support call 1-800-472-6703.

9
1
AirStream User’s Manual
Chapter 2: Installation and Specifications
This chapter discusses the physical installation of the
transceiver and the installation of the software
needed to configure each transceiver. All AirStream
Transceivers need to be configured for a specific
network topology. This process involves
understanding how the equipment is physically
installed and how the software is installed.
Sequentially, all transceivers are configured on a
Host PC prior to being physically attached to their
designated device. Configuration of the transceivers
is discussed in Chapter 4, Configuring your
Transceiver on page 25.
HARDWARE INSTALLATION
Prior to installing your transceiver(s), please count
all of the delivered equipment. Use your packing slip
or purchase order for verification. Each transceiver
needs power and an antenna. It will be attached either
internally or externally to a single device(e.g., PC,
laptop, or printer).
Installing Stand-aloneTransceivers
To Install Stand-alone Transceivers
1. Insert the power supply male connector into the
corresponding female connector slot on transceiver
chassis.
2. Insert Power supply plug into power (i.e., power
outlet)
Power Power RS232 Antenna
In this Chapter
•Hardware
Installation
•Interface
Requirements
•Pin Outs
•Serial
Communication
•Hardware
Specifications
•Software
Requirements
•Software
Installation
•Antennas

Hardware Installation
Installation and Specifications
10
AirStream User’s Manual
Verify LEDs 1 and 2 on front panel blink three times. LED 1 remains lit.
3. Attach the Antenna to the transceiver.
Note that the antenna connection is a reverse thread SMA connection.You
must turn it counter-clockwise to attach.
4. Attach the male connector on the RS232 cable to the matching serial port
on the rear panel of the transceiver.
5. Connect the other end of this cable to the matching serial port on the
device.
Note: Prior to installation on the desired device, all transceivers must first be
connected to and configured with a PC. In the case of some network
installations, it must be the Host PC.

Interface Requirements
Installation and Specifications
11
AirStream User’s Manual
INTERFACE REQUIREMENTS
Design-in Stand-alone
Input Power Requirements
Voltage +5.0 Volts, +/- 5% Greater than 6.5 Volts and
Less than 9.0 Volts
(6.5 -32 Volts if Wide Input
model)
Ripple Less then 10mV(RMS) from DC to
1MHz Less then 250mV(RMS) from DC to 1MHz
Current in Idle
mode ~200mA ~200mA
Instantaneous
Current in Tx mode 550mA 550mA
Time averaged
(over 100mSec.)
Current in Tx/Rx
mode
~360mA ~360mA
Physical Interface Requirements
PCB connector: 1x12 right angle
connector; 0.025 square pin @ 0.1
spacing
Matching connector: AMP Part
Number 2-87499-1 or equivalent
PCB connector: Standard
DB-9(Female)
Electrical Interface Voltage Levels
Input levels Low <1.5Volts;
High > 3.5 Volts @ 20uA
Low -3.0 to -30Volts;
High +3.0 to +30
Output levels Low < 0.4Volts;
High > 3.7 Volts @ 6 mA
Low < -5.0Volts;
High > +5.0 Volts @ 3mA
Open Collector
Output Low < 0.7Volts @12mA N/A

Interface Requirements
Installation and Specifications
12
AirStream User’s Manual
Stand-aloneTransceiver Pin Out
Pin name I/O Function
1 DCD – Data Carrier Detect Output Session Status (True)
2TxD – Transmit Data Output Data from transceiver to the attached
device
3 RxD – Receive Data Input Data into transceiver from the
attached device
4 DTR – Data Terminal Ready Input Data/Command Mode
5 Gnd -- Signal Ground
6 DSR – Data Set Ready Output AlwaysAsserted (High)
7RTS – Request to Send Input HW Flow Control (internally pulled
up)
8 CTS – Clear to Send Output HW Flow Control (default: asserted/
High)
9 RI – Ring Indicate Output Status Change (default: de-asserted/
Low)

Serial Communications
Installation and Specifications
13
AirStream User’s Manual
SERIAL COMMUNICATIONS
In order to configure any transceiver, you must use a 9 pin RS232 cable.
This is necessary because pin 4 is used to transmit the configuration data
into EEPROM and other pins are used during the configuration process as
well. AirStream provides a 9 pin RS232 cable with all Stand-alone
Transceivers. A TTL to RS232 pin adapter is purchasable for Design-in
Transceivers.
You must use the 9 wire cable in the following cases:
•When using the Configuration Manager to initialize/setup a
transceiver.
•When the Host PC is using network utilities.
•When field upgrading the transceiver.
Once configuration is complete, you may opt to use a 3 or 5 wire cable
during field communication with Stand-alone transceivers. These cables
are not provided byAirStream. They can be purchased from a number of
sources.
To determine which cable you need in the field
1. Evaluate which connections you need
2. Determine whether you need a straight through or null cable.
The interface between the transceiver and the attached device is a Data
Communications Equipment (DCE) or Data Terminal Equipment (DTE)
connection requiring either a straight through or Null cable. The Null
cable (or Null adapter) simply crosses the required pins to allow similar
devices to communicate properly (e.g., DCE to DCE). In general:
•The AirStream Transceiver is always a DCE device.
•APC is typically a DTE device.
•Remote devices (customer equipment) can be DCE or DTE depending
on the device.
•DCE to DTE communications require a straight through cable.
Wire Type What’s Connected
3 Wire Connection Data (TxD/RxD) and Ground. Does NOT support Hardware Flow
Control; will work with no Flow Control or Software Flow Control
5 Wire Connection Data and Ground; with Hardware Flow Control (RTS/CTS)
(receive, transmit, ground, hardware flow control). Required for
Hardware Flow Control, will also work with no Flow Control or
Software Flow Control.
9 Wire Connection All 9 pins are connected.

Serial Communications
Installation and Specifications
14
AirStream User’s Manual
•DCE to DCE communications require a null cable or adapter.
Note: The following diagrams assume that the DCE transceiver is sending data
to the DCE or DTE device.
3Wire StraightThrough Cable
3Wire Null Cable
5Wire StraightThrough Cable (flow control in use)
5Wire Null Cable
DTE
Device DCE Transceiver
Pin 2
Pin 3
Pin 5
Pin 2
Pin 3
Pin 5
TxD Data
RxD Data
Gnd
DCE
Device DCE Transceiver
Pin 2
Pin 3
Pin 5
Pin 2
Pin 3
Pin 5
TxD Data
RxD Data
Gnd
DTE
Device DCE Transceiver
Pin 2
Pin 3
Pin 5
Pin 2
Pin 3
Pin 5
TxD Data
RxD Data
Gnd
Pin 7 Pin 7
RTS
Pin 8 Pin 8
CTS
DCE
Device DCE Transceiver
Pin 2
Pin 3
Pin 5
Pin 2
Pin 3
Pin 5
TxD Data
RxD Data
Gnd
Pin 7 Pin 7
RTS
Pin 8 Pin 8
CTS