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RF310
User Manual
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Campbell Scientific RF310, RF312, RF313 User Manual

INSTRUCTION MANUAL
CSI Maxon
Radiotelemetry Network
Revision: 4/03
Copyright (c) 1989-2003
Campbell Scientific, Inc.

Warranty and Assistance

Products may not be returned without prior authorization. The following
act
information is for US and International customers residing in countries
cont served by Campbell Scientific, Inc. directly. Affiliate companies handle repairs for customers within their territories. Please visit www.campbellsci.com to determine which Campbell Scientific company serves your country. To obtain a Returned Materials Authorization (RMA), contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an applications engineer determines the nature of the problem, an RMA number will be issued. Please write this number clearly on the outside of the shipping container. CAMPBELL SCIENTIFIC's shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
e
815 W Logan, Utah 84321-1784
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.
st 1800 North
CSI Maxon Radiotelemetry Network Table of Contents
PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab for links to specific sections.
1. General Radiotelemetry Network ............................1-1
1.1 Introduction ..........................................................................................1-1
1.2 Field Station.......................................................................................... 1-2
1.3 Base Station.......................................................................................... 1-3
1.4 Repeater................................................................................................1-4
2. Assembling the Radiotelemetry Network...............2-1
2.1 Final Layout.......................................................................................... 2-1
2.2 Install Base Station............................................................................... 2-1
2.2.1 Base Station Hardware................................................................ 2-1
2.2.2 PC208W Datalogger Support Software......................................2-2
2.3 Install Nearest Repeater/Field Station ..................................................2-6
2.4 Test the Radiotelemetry Link ...............................................................2-6
2.4.1 A Successful Test........................................................................ 2-6
2.4.2 An Unsuccessful Test .................................................................2-6
2.5 Troubleshooting Unsuccessful Communication Attempts ................... 2-7
2.5.1 Troubleshooting Physical Link Between Base and Field Station 2 -7
2.5.2 Error Messages ...........................................................................2-7
2.5.3 Troubleshooting with the Terminal Emulator............................. 2-9
3. Radiotelemetry Network Components....................3-1
3.1 RF310M Modem .................................................................................. 3-1
3.1.1 Physical Description ................................................................... 3-1
3.1.2 RF310M States............................................................................ 3-1
3.1.3 Setting Station ID........................................................................ 3-2
3.1.4 The Carrier Detect Light............................................................. 3-3
3.1.5 Data Transfer Rate...................................................................... 3-3
3.1.6 RF310 Modem Communication Protocol................................... 3-4
3.1.7 RF310M Modem and the RF Link.............................................. 3-5
3.1.8 RF310 Connections..................................................................... 3-8
3.2 RF310 Radios....................................................................................... 3-8
3.2.1 Radio Description ....................................................................... 3-8
3.2.2 Radio Specifications ................................................................... 3-9
3.2.3 Radio Installation........................................................................ 3-9
3.3 Antennas and Cables ............................................................................3-9
3.3.1 Antenna Mounts........................................................................ 3-10
3.3.2 Antenna Orientation.................................................................. 3-10
3.3.3 Antenna Cables and Connectors............................................... 3-11
3.4 Tripods, Towers, Enclosures, and Power Supplies............................. 3-12
3.4.1 Tripods and Towers for Mounting............................................ 3-12
3.4.2 Enclosures................................................................................. 3-12
3.4.3 Power Supply............................................................................ 3-13
3.5 RF310B Base Station.......................................................................... 3-15
i
CSI Maxon Radiotelemetry Network Table of Contents
3.5.1 RF310B Introduction ................................................................3-15
3.5.2 220, 230, and 240 VAC Conversion.........................................3-15
4. Operation of the Radiotelemetry Network............. 4-1
4.1 Monitoring and Collecting Data - PC208W RF Notes .........................4-1
4.1.1 Basic Concepts............................................................................ 4-1
4.1.2 Using PC208W Setup Window...................................................4-1
4.1.3 Automated Data Collection - PC208W.......................................4-2
4.1.4 General Communication - PC208W Connect Window...............4-3
4.2 Datalogger Initiated Communications..................................................4-4
A. Setting the Station ID..............................................A-1
B. Alternate Base Station Configurations..................B-1
B.1 The Portable Base Station ................................................................... B-1
B.2 Phone-to-RF Base Station................................................................... B-1
B.3 Phone-to-RF Base Station with Measurement Capability................... B-4
C. Power Calculations .................................................C-1
D. Fundamentals of Radiotelemetry...........................D-1
D.1 Radio Waves.......................................................................................D-1
D.2 Antennas ............................................................................................. D-2
D.3 RF310M Modem................................................................................. D-2
D.4 Transceiver.......................................................................................... D-3
E. RF310M States.........................................................E-1
E.1 RF310M-ME State ...............................................................................E-1
E.2 RF310M-SDC State..............................................................................E-1
F. Specifications ..........................................................F-1
Glossary
Figures
1-1 A Basic RF Telemetry Network ...........................................................1-2
1-2 A CR10(X) Field Station......................................................................1-3
1-3 An RF Telemetry Base Station............................................................. 1-4
1-4 A Typical RF Telemetry Repeater Station............................................1-5
3-1 The RF310M Modem........................................................................... 3-2
3-2 Setting the Station ID ...........................................................................3-3
3-3 RF310 On Bracket with Connector ...................................................... 3-9
3-4 The PD237 Crossover Plate Antenna Mount......................................3-10
3-5 The PD46 Clamp Mount.....................................................................3-11
3-6 Type-NM (male), BNC, and Type-NF (female) Connectors..............3-11
ii
Tables
CSI Maxon Radiotelemetry Network Table of Contents
3-7 The RF310B Base Station.................................................................. 3-16
3-8 Top view of the RF310B Base Station............................................... 3-17
4-1 PC208W Main Tool Bar ...................................................................... 4-1
4-2 PC208W Setup Window/Schedule Tab ............................................... 4-3
4-3 PC208W Connect Window, Tools Tab................................................ 4-4
B-1 Portable Base Station...........................................................................B-4
B-2 Phone-to-RF Base Station....................................................................B-7
B-3 Phone-to-RF Base Station with Measurement Capability ...................B-7
3-1 The RF310M Modem ........................................................................... 3-2
3-2 RF310M Command Character Summary............................................. 3-5
3-3 Summary of the Shutdown Block.........................................................3-7
3-4 RF310M Serial I/O to Datalogger Connector Description................... 3-8
3-5 Common Antennas and Characteristics.............................................. 3-12
3-6 PS12LA Battery and AC Transformer Specifications........................ 3-14
3-7 Pin Description for RF310B 25-Pin Port ........................................... 3-16
3-8 RF310B Power Conversions.............................................................. 3-16
iii
CSI Maxon Radiotelemetry Network Table of Contents
This is a blank page.
iv

Section 1. General Radiotelemetry Network

1.1 Introduction

Data retrieval from a remote site can be difficult. To accomplish data collection from isolated sites Campbell Scientific, Inc. utilizes a radiotelemetry (RF telemetry) network. Dataloggers can be accessed by RF telemetry which requires no physical connection from the computer to the datalogger. The RF telemetry link reduces the number of visits to a remote site for data collection.
The RF telemetry network is designed for complete computer control. One computer can establish communication with up to 254 remote sites. PC208W Datalogger Support Software allows data collection from the datalogger, transmitting datalogger programs, and displaying current readings from the datalogger.
The requirements specific to a RF telemetry network include:
• The distance between radio stations should not be greater than
approximately 25 miles.
• The stations should not have major obstacles between them; therefore, they
should be within line-of-sight of each other.
The stations communicate over a radio frequency which is specified in Megahertz (MHz, 148 to 174 MHz and 440 to 470 MHz are supported). A data communication network must have its own specific frequency to pr event interference from other sources. Typical radio frequencies are either VHF (Very High Frequency) ranging from 148 to 174 MHz or UHF (Ultra High Frequency) ranging from 440 to 470 MHz. A typical RF system is shown in Figure 1-1.
Telemetry network’s three basic components are:
• Field Station
• Base Station
• Repeater Station
This manual covers the use of the RF310 and RF312 radios, the RF310M radio modem and the RF310B base station. Some PC208W software topics are also addressed.
1-1
Section 1. General Radiotelemetry Network
FIGURE 1-1. A Basic RF Telemetry Network

1.2 Field Station

Purpose: The field station is where the measurements are made. The
Campbell Scientific datalogger resides at this station taking the desired measurements. Any field station can also operate as a repeater. The only requirement is that the station’s antenna must be able to communicate in all desired directions. This may require an omnidirectional antenna.
Equipment Required:
• Radio
• RF Modem
• Antenna and antenna cable
• Datalogger
• Power supply, enclosure, sensors, and mounting needs
1-2
ANTENNA
Section 1. General Radiotelemetry Network
RF310M

1.3 Base Station

FIGURE 1-2. A CR10(X) Field Station
Purpose: A base station utilizes a computer to collect data from the field
station(s). Normally, all communication to the field stations originate at the base station. Data retrieval, remote programming, and system analysis can all be done from the base station.
Equipment Required:
• Radio
• RF Base Station
• Computer with PC208W software
• Antenna and antenna cable
• AC power
1-3
Section 1. General Radiotelemetry Network
RS232 Cable
To Antenna
POWER ON
RF310B
RF BASE STATION
CARRIER DETECT
MADE IN U.S.A.
PC208W
Datalogger Support Software for Windows

1.4 Repeater

Setup Instructions: Disk 1 of 4
1. Start Microsoft Windows
2. Insert Disk 1 in drive A.
3. From Program Manager, select File menu and choose Run
4. Type a:\setup and press ENTER.
815 W. 1800 N. Logan Utah 84321-1784 (801) 753-2342 FAX (801) 750-9540
Copyright(c) 1996
FIGURE 1-3. An RF Telemetry Base Station
Purpose: To act as relay between two communicating stations separated by
too long of a distance or an obstacle which impedes direct communication. A repeater is not always required in an RF telemetry network. A field station can also function as a repeater.
Equipment Required:
• Radio
• RF Modem
• Antenna and antenna cable
• 12 V and 5 V power supply (PS512M or CH512R and BP12)
1-4
• Enclosure and other mounting needs
RF310M
Section 1. General Radiotelemetry Network
PS512M
RF310
FIGURE 1-4. A Typical RF Telemetry Repeater Station
1-5
Section 1. General Radiotelemetry Network
This is a bla nk page.
1-6

Section 2. Assembling the Radiotelemetry Network

This section provides a logical order for RF network assembly and deployment. Details of specific components in the system are described in Section 3 “Radiotelemetry Network Components.” Section 3 is cross-referenced throughout this assembly section.

2.1 Final Layout

The initial locations of the base, field, and repeater stations have likely been determined already. Locate RF stations on an area map, preferably a topographic map. Draw a line along every communication path. Each field station must have a path connecting it back to the base station. No path can be going through a mountai n or large ob stacle; this would negate the line-of-sight requirement. A station may need to be moved or a repeater station may need to be added if this requirement is not met.
At each station there is an RF modem. Each modem requires a unique ID number (Station ID). The number may range from 0 to 255. On the map, label the base station as 254. Label the remaining stations with different ID numbers. Later, each modem will be set with the corresponding ID number. The Station ID, similar to a phone number, allows the base station to call many different field stations.

2.2 Install Base Station

2.2.1 Base Station Hardware

The major component of the base station is the RF310B Base Station. Refer to Section 3.5 for location drawings and a description of the RF310B Base Station.
1. Remove the top of the RF310B by unscrewing the four screws on the sides.
2. Remove the radio and its cable from its mounting bracket. Mount the radio directly onto the bottom of the RF310B. Secure the BNC connector from the radio's cable to its hole on the back of the RF310B. See Figure 3-7 for assistance.
3. Connect the radio to 12 V, ground, and the RF Modem (RF310M). The RF modem is located behind the front panel above the "POWER ON" light. See Figure 3-8 for assistance.
CAUTION
Radio transmission without an antenna connected can damage radio.
4. Mount the base station antenna in a location that is higher than any surrounding buildings or obstacles. Refer to Section 3.3 for more information on mounting the antenna.
2-1
Section 2. Assembling the Radiotelemetry Network
5. After the antenna is mounted, connect the coax cable between the antenna and the BNC connector mounted in Step 2.
6. Replace the cover of the RF310B.
7. Connect a large gauge (approximately 8 AWG) copper wire from the antenna to a good earth ground. This is for lightning protection. This is required for any antenna, especially if the coax cable from the antenna goes inside a building.
8. Connect a 25-pin RS-232 cable from the computer serial port to the RF310B.
9. After verifying that the RF310B power switch is off, plug in the RF310B's wall transformer.

2.2.2 PC208W Datalogger Support Software

Once the base station hardware is installed, the PC208W software must be setup. If PC208W is not installed on the computer, you will need to install it. Refer to the PC208W Manual if you have questions about the installation procedure or PC208W. PC208W will refer to the RF310M as either “RF Modem” or “RF95”.
There are eight main windows in PC208W:
• SETUP - Used to define communication paths, set data collection parameters, and schedule automatic data collection.
• CONNECT - Used for manual communications with field site. Supports real time data display, graphs, data retrieval and program transfer.
• STATUS - Shows status of sc hedules and communication information.
• PROGRAM - Editor to aid writing datalogger programs.
• REPORT - Generates reports and reduces data stored on computer.
• VIEW - Used to view text files.
• STG MODULE - Used to service storage modules.
• HELP - On line help. Also accessed anywhere by typing F1.
PC208W uses a main tool bar to access each of the eight windows. The shape of the main tool bar can be changed using standard Windows methods. Closing the main tool bar closes all other PC208W windows.
2-2
Section 2. Assembling the Radiotelemetry Network
The SETUP window is used to create a device map which contains the RF Link information. This information includes the station ID, communication path and conditions for calling a particular field station. Procedures for creating an RF communications link are explained in Section 1 of the PC208W manual.
Basic steps required to setup an RF link include: 1) select appropriate communications port (COM Port), 2) attach RF modem to COM port, and 3) attach datalogger to RF modem. The default COM port settings should not be changed. The RF modem default settings do not need to be changed. The default datalogger settings do not need changing except for the “Dialed using RF 95 path:”.
The RF Path (Dialed Using RF 95 Path:), found on the datalogger hardware tab of the setup screen, designates which field station to call. In the example shown, the base station will call the field station with an RF path of 10. If a repeater is needed to contact Field Station 10, the repeater ID must also be specified. For example, "RF Path: 5 10F," would call Field St ation 10 through a repeater with a Station ID of 5. The "F" at the end of the RF Path is optional and is explained later. Click on Save Edits.
2-3
Section 2. Assembling the Radiotelemetry Network
Select the Appropriate Communications port. If your computer uses COM2, click the “Add COM port” button to add an RS-232 communications port. Next click the “Add Device” button.
When the “Add Device” button is clicked the “Add New Device” dialog box opens. Select the RF Modem and attach to the appropriate RS-232 communications port. Click OK.
2-4
Section 2. Assembling the Radiotelemetry Network
This window shows the RF modem (RF1) attached to RS-232 communication port 2. Next use the Add Device button again to connect the datalogger to RF1.
This window shows the CR10X datalogger connected to the RF modem. Notice the Dialed Using RF95 path has been set to 10F. The RF95 path is unique to the RF310M dip switch settings.
2-5
Section 2. Assembling the Radiotelemetry Network

2.3 Install Nearest Repeater/Field Station

Now to install the nearest field station. If it communicates with the base station via a repeater, the repeater station must also be installed.
Following is the order in which a general RF field station should be installed. A repeater station is installed in the same order. For instructions on installing any particular component, refer to either Section 3 of this manual or the Weather Station Manual.
1. Tripod or tower
2. Enclosure and datalogger
3. Antenna - Orient correctly; remember direction and polarization
4. Solar Panel
5. Power Supply
6. Sensors
7. RF Modem - Set the Station ID according to the map
8. Radio - Make sure to connect to RF Modem, to power supply, and turn on power supply

2.4 Test the Radiotelemetry Link

With the field station installed, return to the base station for initial testing of the communication link. An RF link can also be tested at the field site with a portable base station; hardware requirements for the portable base station are described in Appendix B.
Testing begins with turning the RF310B base station on. A quick check of connections is in order. Start PC208W software and open the Connect Window. The “Station List” will show all dataloggers or field stations available. Using the mouse, highlight the datalogger of interest then click on the Connect button. The software requires about 15 seconds to establish a PC to datalogger RF link. The computer is “talking” with the datalogger when the first button to the right of the Connect button changes from Terminate to Disconnect.
If you do not click on the Disconnect or Terminate button before closing the Connect window, PC208W will automatically start calling the datalogger when the Connect window is reopened.

2.4.1 A Successful Test

The test is considered successful if you establish communications between the PC and the datalogger.
2-6

2.4.2 An Unsuccessful Test

When an RF test is unsuccessful, there are three ways to troubleshoot the system:
Section 2. Assembling the Radiotelemetry Network
1. Verify everything is connected properly. See Section 2.5.1 for more
suggestions.
2. Use the error messages in the error file to identify where the link is
breaking down. See Section 2.5.2 for more information.
3. Try communicating from the base station to the field station, one step at a
time. Identify where communications failed. See Section 2.5.3 for more information.

2.5 Troubleshooting Unsuccessful Communication Attempts

2.5.1 Troubleshooting Physical Li nk Between Base and Fi eld
Station
When communication is not established, troubleshooting begins with the simplest RF link in the system, which is usually communication with the nearest field station. There is NO substitute for first checking the hardware connections, Station IDs, and everything listed in the previous section. Below are a few additional items to check:
1. Antenna is used in proximity of metal.
2. Transmitting inside a building.
3. Damaged or shorted cables.
4. Bad or improper connections.
5. Antenna frequency does not match the radio frequency.
6. Base and field station radios aren't using same frequency.
7. Datalogger power drops below 9.6 Volts during RF transmission. Use
datalogger Instruction 10 or volt meter to measure battery voltage.
If the field station's RF310M Modem's Carrier Detect light goes on, then at least a signal is reaching the site. If this occurs, check the following:
1. RF modem's ID matches ID in the RF Path.
2. Field station's radio and datalogger have sufficient power.
3. Radio is connected to RF modem.
4. RF modem is the only thing connected to datalogger's 9-pin connector.

2.5.2 Error Messages

PC208W will log all activity related to each Communications port (COM port). There are two ways to view the messages. On the PC208W main tool bar, click the Status button. The lower right part of the Status window has a button labeled “View Messages”. Click the View Messages button. The message window lists all events. The Status window has a check box to allow these messages to be logged to disk. The log file is a text file.
2-7
Section 2. Assembling the Radiotelemetry Network
One possible error message is "RF1 Failed to Get Attention." This message indicates PC208W cannot communicate with the RF310M modem. Check the following items:
1. RF310B Base Station plugged into computer and wall outlet?
2. RF310B Power Switch turned on?
3. Has PC208W been set up correctly?
4. Is the proper COM port specified in the Setup window?
5. Is the SC12 9-pin cable inside the RF310B connected from the small
circuit board to the RF310M Modem?
6. Is there other software open that uses a COM port?
Another possible error message is "CR10X_1 Failed to Connect" (where “CR10X_1” is the station name). If this message is given without the previous message, "RF1 Failed to Get Attention", PC208W did connect with the RF modem but not the datalogger. In this case, check the following items:
1. Are the radios plugged in to the RF modems?
2. Are the radios connected to power?
3. Verify that nothing but an RF modem is connected to the datalogger's 9-pin
connector.
4. Are Station IDs set properly in the RF Modems?
5. Is the RF Path in the Setup Window correct?
6. Are the antennas oriented correctly?
7. Check all antenna cable connections.
8. Turn radio off. Unplug the SC12 9-pin cable from the RF310M in the
RF310B, reconnect the SC12 cable and watch the carrier detect light. Does the light stay on for one second, off for one second, on for one second, and then off? If not, the RF310M could have bad RAM or ROM. Also check the field/repeater station modems.
9. Is the field station datalogger turned on and does it have sufficient power?
VERIFY NEXT ERROR MESSAGE
The error message "RF Modem Does Not Respond" can occur if communication is not returned to the base station. Check the following items:
1. Are all RF Modems connected to radios and dataloggers?
2. Are the antennas oriented properly?
3. Is the SDC switch open?
2-8
4. Is the proper COM port being specified?
Section 2. Assembling the Radiotelemetry Network

2.5.3 Troubleshooting with the Termi nal Emulator

A general understanding of the communication sequences is necessary to properly trouble-shoot an RF link. The base station RF modem (RF310M) is called the Start Of Link modem, or SOL modem. The field station RF modem is called the End Of Link modem, or EOL modem. When powered up, the SOL modem immediately goes into a Wait Mode. The RF310M Modem has five different modes of operation; these are described in Section 3 of this manual.
PC208W, Connect window has two tabs: Tools and Terminal Emulator. With the Tools tab active, select the datalogger of interest in the “Station List”. Select the “Terminal Emulator” tab. Once in the Terminal Emulator window, select “Open Port”. Terminal Emulator allows you to send individual commands to each device in the communication path. This will allow you to test each piece of the communication path separately.
Try the following TASKs in order.
TASK A, Contact RF310B: Press [ENTER] a few times, to set the baud rate between the Base Station's RF modem and the computer. This baud rate can be set at 300, 1200, or 9600 baud. The RF310M will detect the computer’s baud rate and match it.
RESPONSE IF SUCCESSFUL: "!" prompt given, SOL modem is now in the Local Command Mode. This is where PC208W is communicating with the RF310B base station.
If TASK A is unsuccessful, check:
1. Communication port (COM port) could be configured improperly,
computer setup.
2. The wrong COM port may be specified in the Station File, PC208W setup.
3. Communication cable may be connected to the wrong port. Use the correct
serial port, not the parallel port.
4. Computer mouse driver could be interfering with COM port.
5. The base station or radio may not be powered sufficiently.
6. The radio and RF modem may not be connected properly.
7. Communications cable between computer and RF310B must be standard
RS-232 cable.
TASK B: Task A must be successful before Task B can be te sted. To test the RF link; enter the 'RF Path' at the “!” prompt. For example, "S5 8F" communicates to a field station with a Station ID of 8 through a r epeater with an ID of 5. After typing the 'RF Path', press [ENTER].
RESPONSE IF SUCCESSFUL: "$" prompt given. The dollar sign prompt is returned by the EOL modem. The “$” indicates you are now communicating with the modem at the field site.
2-9
Section 2. Assembling the Radiotelemetry Network
Things to check if TASK B is unsuccessful:
1. Improper antenna orientation.
2. Bad connections on the antenna cables, or improper antenna cables.
3. Insufficient current supply at the base station. Is AC power good?
4. Field station radio is not connected to power or power supply is weak.
Check battery voltage under load, should be no less than 11.7 volts. Battery volta ge no load and no charging source should be about 12.4 vol ts.
5. Field station radio and RF modem may not be connected properly. Check
cable.
6. Field station RF modem is not receiving 5 Volts from datalogger
connection on pin 1 of the 9-pin cable. The RF modem must be connected to the datalo gger Serial I/O or CS /IO port with a stra i ght through cable, SC12.
7. Using wrong RF path. Are the RF310M dip switches set correctly?
TASK C: Establish link and baud rate between RF Modem and Datalogger by slowly pressing [ENTER] a few times. Pause about 2 seconds between each press of the enter key.
RESPONSE IF SUCCESSFUL: "*" from datalogger. The Asterisk prompt indicates the datalogger is now communicating with the computer at the base station.
Things to check if TASK C is unsuccessful:
1. Datalogger is on and has sufficient power.
2. Datalogger does not think it is still communicating with some other device
like a CR10KD keypad or phone modem.
3. Datalogger and RF Modem are the only devices connected together on the
9-pin connections.
Upon successful completion of TASK C, the datalogger is now in standard Telecommunications Mode. See Section 5 of the datalogger manual for more information about the Telecommunication mode. At this point the SOL modem and EOL modem will be in the Transparent Mode of operation. Type "A," wait 2 seconds, and then type [ENTER] to receive a status sequence from the datalogger. If everything is successful, type “E” to drop the link. If task C is successful, PC208W should be able to call the field site.
2-10

Section 3. Radiotelemetry Network Components

3.1 RF310M Modem

The RF310M is an interface between the computer and the radio when used at a base station, and an interface between the radio and the datalogger at a field station. In a repeater station, the RF310M is an interface between two other communication stations. The RF310M is an RF modem. PC208W will refer to the RF310M as either “RF Modem” or “RF95”.

3.1.1 Physical Description

The front panel of the RF310M is shown in Figure 3-1. There are two ports for interfacing external devices. The port labeled TRANSCEIVER connects to the radio, and the port labeled SERIAL I/O connects to the datalogger. In the case of a repeater or phone-to-RF base station, The SERIAL I/O port will connect to the PS512M or CH512R null modem port. The red light labeled CARRIER DETECT is used primarily to indicate when a carrier frequency has been detected by the radio.

3.1.2 RF310M States

The RF310M Modem operates in one of two separate states. The RF310M can be utilized in either the RF310M-ME (Modem Enable) state or the RF310M­SDC (Synchronous Device Communication) state. The proper state must be determined before employing the RF310M in the field. A switch inside the RF310M needs to be set accordingly.
The RF310M-ME state is ALWAYS used with 21X and CR7 dataloggers. The RF310M-ME state is NORMALLY used with all dataloggers. SDC compatible dataloggers (CR10, CR10X, CR23X, CR510, and CR500) can also use the RF310M-SDC state. The SDC state has the advantage that a phone-to-RF base station can have measurement capability. Only the RF310M at a phone-to-RF base station with measurement should to be switched to the RF310M-SDC state.
A switch with nine different dip switches is inside the RF310M; the RF310M cover must be removed to locate the switch. The ninth switch sets the RF310M state. The RF310M-ME state is chosen by setting the ninth dip switch open, represented by 1. The RF310M-SDC state is chosen by setting the ninth dip switch closed, represented by 0. Refer to Figure 3-2.
3-1
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