RF RS232 User manual

RS232 RADIO MODEM 232C-868FR1

• RS-232 Compatible

• Selectable Baud Rate 1200bps – 38.4Kbps

• Range up to 800 Metres

• European Operation 868MHz

• RF Power 0-7 dBm

• Network Configurable

• Transparent or Data verified communications modes

• 4 User Configurable Digital I/O Channels

• Standard Hayes Command Set

• Internal LED indication of Power and Data TX & RX

• 12Vdc Power Supply

• Conforms to ETSI 300-220

• Requires no radio licence to operate

• Tough ABS enclosure

Description

The R.F. Solutions 232C-868FR1 radio modem provides fast and reliable RF data communications at

an exceptionally competitive price. Whilst the RF modem is simple to use it is also highly adaptable and

can be used in a wide variety of applications.

The modems can be configured for various operating modes to

provide:

1. An ‘invisible’ RS232 point to point link, reproducing the

function of a half duplex RS232 cable.

2. A RS232 point to point link with data flow control to provide

data verification.

3. A functionality similar to that of a client/server network,

where each modem is assigned an address with a

maximum of 255 clients per network and a maximum of

65535 networks.

4. Point to point data transfer for up to four digital I/O signals

with continuous resend and automatic data

acknowledgement.

The modem is supplied in a tough ABS enclosure, with wall mounting lugs. The external 868MHz

antenna offers a range of up to 600 metres line of sight. The modem is supplied with an RS232 cable

and requires only a 9-12Vdc power supply.

RS232 RADIO MODEM 232C-868FR1

Contents

1Technical Specifications .................................................................................3

1.1 Functional description...............................................................................3

1.2 Status LED’s.............................................................................................3

1.3 Connections..............................................................................................3

1.4 Electrical Characteristics...........................................................................4

1.5 Temperature Range and Dimensions .......................................................4

2Software Specifications...................................................................................5

2.1 Operating modes ......................................................................................5

2.2 Quick Setup Guide....................................................................................8

2.3 Hayes or ‘AT’ Mode ..................................................................................9

2.4 Standard commands description...............................................................9

2.5 Radio Test Commands ...........................................................................10

2.6 Registers description ..............................................................................10

3Ordering Information.....................................................................................12

RS232 RADIO MODEM 232C-868FR1

1 Technical Specifications

1.1 Functional description

The RF modem is software configurable using the

standard AT command set. Commands can be entered

via the RS232 port using a control device with

communications software (for example a PC with

windows HyperTerminal). Using this method the

modem can be set to four different modes.

In transparent mode the modem provides an ‘invisible’

serial link and reproduces the function of a half duplex

RS-232 cable. Transparent secured mode operates in

the same manner of transparent mode and also

provides data flow control to ensure the correctness of

transmitted data frames. This provides the user with a

fully data verified point to point communications link.

Addressed secured mode provides a functionality

similar to that of a client/server network except that

there is no server and all of the clients can

communicate with each-other. Each modem is given an

address with a maximum of 255 clients per network and

a maximum of 65535 networks. In I/O copy mode the

four digital I/O channels can be used to transfer TTL

logic signals from one modem to another. As long as

the modem remains in I/O copy mode the signals are

automatically resent after a 1 second time-out with

ensured reliability via automatic data

acknowledgement. Detailed explanations of the

available software modes are given in section 2.

1.2 Status LED’s

The RF Modem has six LED’s, representing the following signals:

• TxD – Transmitting data

• RxD – Receiving data

• CTS – Clear to send data

• RTS – Ready to send data

• PWR – Power on

1.3 Connections

1.3.1 Digital I/O

When used in I/O copy mode four Digital I/O signals can be presented on the 8 pin SIP header on J2, as

shown in the diagram above. Please refer to section 3.3 for control information when using the modem

in I/O copy mode.

1.3.2 Power

The RF Modem requires a 9 - 12V @ 100mA power source. On the power jack the centre is +ve

connection.

RS232 RADIO MODEM 232C-868FR1

1.3.3 RS232 Connector

The RF Modem interfaces to the host computer via an RS232 connection using a standard DB9 connector as

shown in the diagram below.

1.4 Electrical Characteristics

Specification Conditions Min Typical Max Units

Channel center frequency - 869.850 MHz

Aggregate air data rate - 10 kbps

Modulation type - FSK -

Range Line of sight 800 m

Conformity testing / Standard - ETSI 300 220 -

Standby current consumption 0.004 0.006 0.020 mA

Receiving

Sensitivity CER <10-3 -101 dBm

Average CER Input signal -50

dBm <10-6 -

P1dB CER <10-3 -10 dBm

Number of channels - 1 -

Selectivity At +/-150 kHz 36 dB

Current consumption 30.0 33.0 33.0 mA

Transmitting

Output power @ Vcc = 12 V - 7 dBm

Number of channels - 1 -

Current consumption 27.0 30.0 33.0 mA

1.5 Temperature Range and Dimensions

Storage Temperature: -40oC to +85o C.

Operating Temperature: -10oC to +55o C with full specification characteristics

-20oC to +85o C with performance deteriorated

Enclosure dimensions: 110mm x 85mm x 35mm

PCB dimensions: 99mm x 74mm

PC Serial Port

DTE

(DB25)

RF Modem

DCE

(DB9F)

DTR

GND

RTS

CTS

PC Serial Port

DTE

(DB9)

RF Modem

DCE

(DB9F)

DTR

GND

RTS

CTS

RS232 RADIO MODEM 232C-868FR1

2 Software Specifications

2.1 Operating modes

The RF modem is able to operate in four different modes which can be configured by setting register

values using AT commands. Sections 2.2 - 2.4 give a full explanation of how to program the registers,

the operation of the different modes is explained in detail in the following paragraphs.

2.1.1 Transparent Mode

In Transparent Mode, the RF modem behaves like a wired serial link, i.e. the modem does not only

transmit to the radio channel every data received on the serial link, but also transmits on the serial link

the information received on the radio channel.

Basically the RF modem reproduces the half-duplex function of a RS-485 cable.

There is no flow control performed by the modem in the transparent mode, neither on the serial link nor

on the radio link. Flow control must be carried out by software applications via various protocols in use

such as MODBUS, JBUS, etc…

Consequently, in Transparent Mode it is not possible to change the modems parameters without a

temporary return to Hayes mode.

NOTE: The user’s software application must adequately verify that all buffers are transmitted correctly

taking into account that an interrupted transmission link may lead to losing one or several buffers.

2.1.2 Transparent Secured Mode

In order to confirm the correctness of the transmitted data frames, data flow control between the

modems is added to the Transparent Mode, so that each data transfer is “data verified”. This mode shall

be operated for point-to-point communications only.

Transparent Secured Mode or Transparent «Data Verified» Mode’s purpose is to offer an optimal radio

link quality and to provide transparent mode with the necessary security in case flow control would not

be included within the user’s application software.

The risk of data loss is much lower than during the use of application software only because this latter is

dependent on the intermediate times inserted by the serial link.

Moreover, a flow control is performed on the serial link in order to warn the user that the buffer (including

132 characters) is saturating. The warning level is default set to 132 characters and can be programmed

via register S218.

NOTE: The user’s software application must adequately verify that all buffers are transmitted correctly

taking into account that an interrupted transmission link may lead to losing one or several buffers. After

N Time repetition of a buffer (N programmable up to 255 with S223) without a correct acknowledgement

the buffer shall be considered as lost.

2.1.2.1 «Secured» link Algorithm

The transmitting modem proceeds to data framing:

• Transferred Data Count up.

• Transferred Data Frame Type.

• Frame number.

• Data to be transmitted.

• 16 bits Checksum.

The receiving modem analyses this data frame and checks its consistency.

When the data frame is received correctly, the receiver transmits an acknowledgement back to the

transmitter, and delivers the received data framing to its serial link.

In case the reception is not without errors, the receiver requests a new framing transmission to the

transmitter. The number of repetitions depends on the parameter programmed in the modem

configuration (Register S223).

At serial port level, each transmitted data frame is «Data Verified», but no statement asserts to the user

whether the data frame has been transmitted yet or not.

RS232 RADIO MODEM 232C-868FR1

In «Transparent Secured Mode», a time-out is defined to indicate the end of a frame. This time-out is a

programmable parameter (Register S214) separating each frame from the next one.

2.1.3 Flow control

Two types of flow control are available:

• Hardware: CTS/RTS (the modem manages RTS signal only).

• None

• '0' stands for hardware flow control.

• '2' indicates no flow control.

2.1.4 Addressed Secured Mode

The Addressed Secured Mode is similar to a client/server network mode, the difference is that there is

no server and all clients can communicate with each other.

Addressed secured mode’s purpose is to offer an optimal radio link quality and to provide transparent

mode with the security of the secured mode. This transparent addressed secured mode includes the

additional feature to use an address field to address one particular client.

Data Management is as follows:

• Data transmissions are fully «Data Verified».

• The modem acts as in transparent mode, adding frame encapsulation.

• Identification of clients with a specific number added at the beginning of each data frame.

Example: "1=Hello" sends the data frame "Hello" to Client No.1.

• The receiver client recognises the client transmitting modem by the number starting the data

frame.

Example: "002=Hello" indicates that data frame "Hello" comes from Client No.2. o

RS232 RADIO MODEM 232C-868FR1

• You can add one frame ending character: Carriage Return<CR>, after each received frame.

This in order to distinguish each frame.

Example: "002=1458<CR> 003=4587<CR>" indicates data frame "1458" comes from Client No.2, and

data frame "4587" comes from Client No.3.

• No server, each client can communicate with each other.

• Maximum of clients per network = 255, maximum of networks = 65535.

• The data frame format can be configured (client ID at beginning, CR at end, Adcon modems

frame format compatibility) via register S255.

2.1.5 Basic illustration of transparent modes

Transparent mode

Serial Link No.1: <ABCD> -> <ABCD> : Serial Link No. 2

Serial Link No.1: <FGHI> <- <FGHI> : Serial Link No. 2

Transparent secured mode

Serial Link No.1: <ABCD> -> <ABCD> : Serial Link No. 2

ACK <- ACK

Serial Link No.1: <RSTU> -> <RDTU> : Serial Link No. 2

NACK <- NACK

<RSTU> -> <RSTU> : Serial Link No. 2

ACK <- ACK

Serial Link No.1: <FGHI> <- <FGHI> : Serial Link No. 2

ACK -> ACK

Transparent addressed secured mode

Serial Link No.1: 2=<ABCD> -> 1=<ABCD> : Serial Link No. 2

ACK <- ACK

Serial Link No.1: 2=<RSTU> -> 1=<RDTU> : Serial Link No. 2

NACK <- NACK

2=<RSTU> -> 1=<RSTU> : Serial Link No. 2

ACK <- ACK

Serial Link No.1: 2=<FGHI> <- 1=<FGHI> : Serial Link No. 2

ACK -> ACK

2.1.6 I/O Copy mode

In I/O Copy mode the I/O lines of a RF modem are copied to the other RF Modem. The following

registers have to be programmed:

• Master: S220=6 and S260 for the I/O configuration.

• Slave: S220=7 and S260 for the I/O configuration (‘complementary’ configuration according to

master)

Once configured as above, both modems start I/O copy as soon as they get out of Hayes mode (ATO

command).

• This mode works as follows:

• The master sends its input values to the slave.

• The slave sends an Ack to the master when the ‘input’ data arrived.

• The slave copies the master’s input on its output.

• After a 1 second time-out, the slave sends its inputs to the master.

• The master returns an ‘Ack’ when the input data is arrived.

• The master copies the slave’s inputs to its outputs.

• After a 1 second time-out, the master sends its inputs to the slave.

• And so on…

RS232 RADIO MODEM 232C-868FR1

The I/O Copy mode stops as soon as the modem returns to Hayes mode (+++ command).

2.2 Quick Setup Guide

The 232C-868FR1 is supplied with all its settings in the default values. It can be used with bundled MTC

workbench software to establish a simple transparent point to point link by following the steps outlined

below.

1. Install the MTC workbench software, supplied on the bundled CD onto your PC.

2. Connect your modem to the COM port of your PC using the supplied RS232 cable, apply

power to the modem and load the MTC workbench software. The PWR and RTS LEDs will

now be on.

3. When prompted to launch auto-configuration select

‘Yes’. The modem will now be automatically detected

by the software program.

4. In the Settings menu change the user level to

advanced. Now repeat auto-configuration by selecting

the option from the Modem menu.

5. From the Tools menu select Terminal and open a

terminal window on the COM port connected to the

modem. You can now type text into the terminal

window, if the Port is opened (By pressing the ‘Open

Port’ button) then the text data will be sent over the

serial link to the modem, as shown opposite.

6. Repeat steps 1-5 using either another PC or a

different COM port on the same PC.

7. If the configuration settings are the same for both

modems then you should now be able to wirelessly

send text from one COM port to the other.

Notes

For full instructions on the use of the MTC workbench software please refer the manual provided

on the CD bundled with the modems.

The modems configuration settings can be changed by double clicking on the modem name,

‘B868-tiny’ under the COM port in the tree window. Once you have changed the settings to those

which you require they can be propagated through to the modems registers by clicking on the

Apply button.

You can also change the configuration settings by entering AT commands into the terminal

window in MTC workbench. Please refer to section 2.3 below for a description of the AT

commands available.

RS232 RADIO MODEM 232C-868FR1

2.3 Hayes or ‘AT’ Mode

The Hayes or 'AT' commands comply with the Hayes protocol used in PSTN modem standards. This

‘AT’ protocol or Hayes mode is used to program the modem parameters, based on the following

principle:

• A data frame always begins with the 2 ASCII ’AT’ characters, standing for ‘ATtention’.

• Commands are coded over one or several characters and may include additional data.

• A command is always ended by a <CR> Carriage Return.

A T Command Additional command ... <CR>

Note: Register numbers and values used in the AT commands are in decimal format.

The only exception to this data-framing rule is the command to enter the enter AT-mode. In this case,

only the escape code (‘+++’ by default) must be typed and followed by a silent time at least equal to the

time out. <AT> and <CR> shall not be used.

Note: All characters of the same command must be typed in quickly to prevent a timeout before the

whole command has been entered. Alternatively commands can be cut and paste from notepad to

ensure the whole command is entered within the time limit.

Note: Generally a successful AT command will return 0 and an unsuccessful command will return E.

Despite its similarity to standard telecommunication modems, the 232C-868FR1 remains a radio link

modem and is consequently fitted with some particular additional “AT” commands.

2.4 Standard commands description

'+++' Enter AT-mode.

This command gives an instant access to the modem parameter set-up (Hayes or AT-

mode), whatever the actual operating mode in process might be. This command shall not

be started with AT, but by a silent time duration whose parameter entering is defined in

milliseconds in Register S214. N.B.: By activating the AT-mode, the modem inactivates

radio reception.

‘ATO’ Exit AT-mode

This command activates the operating mode as stored into register S220.

'ATSn?' Display value of register n.

The modem operating parameters are stored in ‘S’ classified Registers. S Registers are

numbered from 0 to 512. Some parameters are standard for every Hayes type modems,

other are specific to the 232C-868FR1 modem (See section 2.6 for register descriptions).

Operating parameters are stored in EEPROM memory and automatically set-up during

modem reset and modem turn on.

'ATSn=m’ Change value of register n to m.

Changed values of registers are automatically stored in the modem EEPROM memory.

'AT/S’ Display values of Significant Registers.

All significant registers for the modem (radio configuration, serial configuration, operating

mode,) are sent to the serial link, ready to be displayed by software like Windows

HyperTerminal.

'AT/V’: Display values of the Modem Software version.

RS232 RADIO MODEM 232C-868FR1

Information concerning the version number and installation date is sent on the Serial Link;

ready to be displayed by Software like Windows HyperTerminal.

'ATR’: Hayes registers reset to default values

This command allows the user to reset ALL the stored EEPROM registers to their default

values (see registers description below).

'ATP’: Switch to Stand-by mode

This command allows the user to switch to Stand-by mode. The Modem is in Normal

Mode by default. The Modem switches back to Normal Mode with a character reception

from the Serial link.

2.5 Radio Test Commands

These special AT commands are integrated into the RF modem in order to make measurements during

continuous transmission, and are primarily used during radio tests (radiated power, bandwidth, etc.) to

show conformance to the ETS 300 220 standard.

It stops when any character is sent:

• ATT0 <CR>: Transfer of a pure carrier ‘0’

• ATT1 <CR>: Transfer of a pure carrier ‘1’

• ATT2 <CR>: Transfer of a modulated carrier at F(maximum)

• ATT3 <CR>: Transfer of a modulated carrier at F(average)

• ATT4 <CR>: Transfer of a modulated carrier at F(minimum)

2.6 Registers description

The RF modem can offer several possible configurations using a set of parameters. Those parameters

are located in registers and have a default value. This value can be modified or consulted via Hayes

commands.

The parameters of the radio modem are stored in the EEPROM and can therefore be changed up to

10,000 times. The parameters are available when switching on the modem. The registers are listed

below:

Radio

Access Register Name Description

R/W S204 Carrier

Length Indicates the radio carrier length in milliseconds, sent at the beginning

of each radio frame. Valid between 4 and 50 milliseconds.

Default value: 15ms

Serial Link

Access Register Name Description

Indicates the serial link rate: Value Rate

R/W S210 Baud Rate '1'

'2'

'3'

'4'

'5'

'6'

1200 Bits/s

2400 Bits/s

4800 Bits/s

9600 Bits/s

19200 Bits/s (Default value)

38400 Bits/s

Indicates the number of data bits on the serial link:R/W S211 Data Length '7'

'8' ->

-> 7 data bits.

8 data bits (Default value)

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