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ELPRO 805U, User Manual

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ELPRO 805U User Manual Download Page 9

 805U Radio Modem  Module

 User Manual

Page 

10

©

   November 2004

1.4

Repeater Units

A 805U unit may be used as a repeater to re-transmit radio messages.  The purpose of a
repeater unit is to extend radio range.

In transparent mode,  there can be an unlimited number of repeaters,  however with some
conditions  (refer to Section 3.5).

The repeater in transparent mode will repeat every  transmission it receives.

In controlled mode,  up to five repeaters may be configured for any transmission path.  The
repeaters are configured by address.

PLC

805U

805U

RS485

PLC

PLC

805U

PLC

REPEATER

805U

805U

805U

805U

805U

805U

805U

805U

Summary of Contents for 805U

Page 1: ...ELPRO Technologies Pty Ltd 9 12 Billabong Street Stafford Q 4053 Australia Tel 61 7 33524533 Fax 61 7 33524577 Email sales elprotech com Web www elprotech com 805U Radio Modem User Manual...

Page 2: ...dem We trust it will give you many years of valuable service ATTENTION Incorrect termination of supply wires may cause internal damage and will void warranty To ensure your 805U enjoys a long life dou...

Page 3: ...authorised by the relevant Authority in your country on a non protection basis Although all care is taken in the design of these units there is no responsibility taken for sources of external interfe...

Page 4: ...7 3 1 POWER UP AND NORMAL OPERATION 17 3 2 SERIAL AND RADIO DATA 17 3 2 1 Character Type 18 3 2 2 Serial Data Rate 18 3 2 3 Radio Data Rate 19 3 3 ADDRESSING 19 3 4 TRANSPARENT MODE 20 3 5 TRANSPARENT...

Page 5: ...nt Mode 31 4 4 2 Controlled Mode 32 4 4 3 Other Parameters 34 4 5 HAYES COMMANDS 37 4 6 CONFIGURATION EXAMPLES 42 4 7 SWITCH CONFIGURATION 44 CHAPTER FIVE SPECIFICATIONS 46 CHAPTER SIX TROUBLESHOOTING...

Page 6: ...io frequency has been selected to meet the requirements of unlicensed operation for remote monitoring and control of equipment That is a radio licence is not required for the 805U modules in many coun...

Page 7: ...In transparent mode it is assumed that the host devices control the flow of data In controlled mode the 805U units control the flow of data 1 2 Transparent Mode The default configuration of the 805U...

Page 8: ...pt to transmit the data up to five times until an acknowledgment ACK is received If an acknowledgment is still not received then the DCD signal on the RS232 port will be reset and a alarm message can...

Page 9: ...In transparent mode there can be an unlimited number of repeaters however with some conditions refer to Section 3 5 The repeater in transparent mode will repeat every transmission it receives In contr...

Page 10: ...operate reliably over large distances The distance which may be reliably achieved will vary with each application depending on the type and location of antennas the degree of radio interference and o...

Page 11: ...n the antenna and coaxial cable should be carefully taped to prevent ingress of moisture Moisture ingress in the coaxial cable is a common cause for problems with radio systems as it greatly increases...

Page 12: ...nds of a link provides a double improvement Yagi antennas are directional That is they have positive gain to the front of the antenna but negative gain in other directions Hence Yagi antennas should b...

Page 13: ...ative is connected to the GND terminal internally The positive side of the supply must not be connected to earth The DC supply may be a floating supply or negatively grounded The power requirements of...

Page 14: ...host device using a multi drop cable Up to 32 devices may be connected in each multi drop network Note that the RS485 port is shared internally with the RS232 port make sure that the RS232 port is dis...

Page 15: ...805U Radio Modem Module User Manual Page 16 November 2004 HOST 805U HOST RS485 CONNECTIONS 120 RS485 SUPPLY RS232 DIP SWITCH FOR 120 120 HOST HOST 805U RS485 CONNECTION USING TERMINATING RESISTOR...

Page 16: ...mmunications link is established DCD Off Communications failure or link not established Other conditions indicating a fault are described in Chapter Six Troubleshooting 3 2 Serial and Radio Data The 8...

Page 17: ...n the 805U will transmit the actual data input If more data is input than the maximum size then the 805U will transmit multiple packets until all of the data is transmitted Because of radio start up d...

Page 18: ...mode unit addressing is included An error check 16 bit CRC may be configured by the user Up to 530 bytes of data may be transmitted in a message the maximum message size is configurable between 10 and...

Page 19: ...d to devices designed to operate over a multidrop network such as PLC systems designed for operation over a RS 485 network The time taken to transmit a message is lead in system group addr data error...

Page 20: ...and T will receive the re transmitted message but will not output the message as the group address is now wrong Module X will receive the message and will output the message as the group address is no...

Page 21: ...and also activate their DCD output signal If the master unit does not receive the acknowledgment the DCD output will reset When the connection is made DCD set the 805U units can transmit data to each...

Page 22: ...tion address If OK check error check Radio RX LED flashes If message okay transmit back an ACK message Radio TX LED flashes Acknowledgment received okay communication complete Serial data is output Se...

Page 23: ...ay be operated in a low power condition where it switches off its receiver power consumption is reduced to approx 30 of normal The low power condition will occur if the 805U is configured for auto con...

Page 24: ...Repeaters Where intermediate repeaters are configured each repeater will re transmit the message onto the next address When the destination address is reached the destination module will return an ack...

Page 25: ...nits It is possible to configure different units in the same system with different operating modes however the system will not operate A 805U unit configured in one mode will not process a message rec...

Page 26: ...rial rate is less than the radio rate the 805U will automatically enter an appropriate value in S18 The user can change this value If the serial rate is the same as the radio rate or more than there i...

Page 27: ...00 bits sec reduce the rate to 19200 bits sec If large radio messages are being transmitted reduce the maximum message length and transmit the data in more messages of smaller size Another common prob...

Page 28: ...r data rate Operating mode You need to decide which operating mode you wish to use Modes are transparent or controlled auto connect single connect low power mode error checked or no error check These...

Page 29: ...nding to the configured unit address then the data is not output to the serial port but the message is re transmitted but with the first or normal group address inserted 4 3 Default Configuration The...

Page 30: ...ure Module icon on the toolbar When you read or configure a program you will see the communication messages between the program and the module in the Serial Communications box in the bottom left hand...

Page 31: ...address If the transparent repeater receives a message from the second group it will re transmit the message but it will not output the data 4 4 2 Controlled Mode If you select any of the controlled...

Page 32: ...auto connect slave module is to enter its unit address Single Connect In single connect controlled mode the host devices use AT commands to select destination addresses to connect to Normally the onl...

Page 33: ...u select a rate which is faster than the serial rate the 805U will automatically set transmission delay parameters in registers S18 and S19 refer section 3 8 To disable this deselect the PLC Mode box...

Page 34: ...x Then there will be no delay data bytes will be transmitted as soon as they appear in the input buffer The number of Data Bits can be selected as 7 or 8 The number of stop bits can be 1 or 2 Parity c...

Page 35: ...selection of DTR will be automatically made DCD Control The DCD signal on the RS232 port can be used to give an indication of communications link status in controlled mode Note that the link is alway...

Page 36: ...nent memory EEPROM unless the Hayes command for recording the configuration AT W is sent When the configuration changes are made the module must be put back into its operating mode by using the online...

Page 37: ...below Default is 8 data bits 1 stop bit no parity 0 7 Data Bits 0 No Parity 2 8 Data Bits 4 Zero Parity Parity bit always zero 0 1 Stop Bit 8 Odd Parity 1 2 Stop Bits 12 Even Parity For example AT B9...

Page 38: ...ts radio receiver and microprocessor When the host activates the DTR signal the module will start up and attempt to connect to its slave address Controlled mode single connect AT E1 M2 L0 both master...

Page 39: ...t the link and reset DCD The check time can be configured using the ATS6 command For example ATS6 10 sets the check time to 10 sec If the slave module does not receive a radio message within the link...

Page 40: ...default E1 Enable CRC Error Checking View Configuration The AT V command will output to the terminal a listing of all configuration settings AT V Show all settings including S registers V0 Same as AT...

Page 41: ...o the same random number AT S138 Set the group address and unit secondary group address AT G1 AT U2 The group address for the right hand side module will be set to 2 this corresponds to the secondary...

Page 42: ...to 7 1 2 even AT B13 Exit and save the configuration AT W ATO Controlled Mode Auto connect link with repeaters Assume that default settings are used for data rates and character types The only configu...

Page 43: ...at 100 can act as a repeater Set the module to factory default settings AT F Set the system address to the same random number AT S217 Set the unit address to 100 AT U100 Set the autodial address to 10...

Page 44: ...at start up 0000 Normal Operation no change 0100 Restore Factory Defaults AT F Baud rates 1100 Perform Transmit BER Test AT T0 for use with AT T1 at other module see section 6 2 1 Serial Radio 0010 Tr...

Page 45: ...0 99 RH non condensing Full performance Typical performance Power Supply Nominal supply 10 to 30VDC 13 to 24VAC Overvoltage and reverse voltage protected Current Drain 12VDC 80 mA quiescent 20mA low p...

Page 46: ...400 19200 38400 57600 76800 115200 Byte format 7 or 8 data bits Stop start parity bits configurable System Parameters Operating modes Transparent mode Controlled mode Broadcast system Addressed commun...

Page 47: ...correct operation of the unit This LED extinguishes on failure as described above When the OK LED extinguishes shutdown state is indicated On processor failure or on failure during startup diagnostic...

Page 48: ...t can be forced to transmit by selecting AT T0 or by selecting 0011 on the four DIL switches and resetting the power to the module Also measure the background noise by stopping transmission from the r...

Page 49: ...n corrupted Corrupted headers do not contribute to the bit errors which are calculated only on the 1 000 bit frame BER testing may also be performed in both directions simultaneously In this case a re...

Page 50: ...erations or profits and ELPRO is not liable for any consequential damages or loss of operations or profits resulting from the use of these products ELPRO is not liable for damages losses costs injury...

Page 51: ...te selection Automatic Baud Detection control C0 115 200 baud C1 1200 baud C7 28 800 baud C2 2400 baud C8 31 250 baud C3 4800 baud C9 38 400 baud C4 9600 baud C10 57 600 baud C5 14 400 baud C11 76 800...

Page 52: ...a Bits 12 Even Parity AT C Data Carrier Detect DCD Control DCD is always on in transparent mode C0 DCD Always on C1 DCD High when connected Low otherwise C2 DCD Always on Pulses low on Disconnect 0 1...

Page 53: ...nnect mode slave The module continuously attempts to answer any incoming call Use DTR with the AT D command to control the connection AT M Operating Mode This allows selection between transparent mode...

Page 54: ...within this time the module resets the connection If used should be larger than the value in S6 S Registers S Registers provide a method of storing operational parameters of the module A radio module...

Page 55: ...connected S12 4 Activity timer timed out S12 5 No response to dial request to remote module S12 6 BUSY response from remote module on dial request S12 7 Character received from host while attempting...

Page 56: ...selects extended response codes ATQ0 disables all response messages ATQ1 enables response messages The following table describes the messages A symbol indicates that messages is displayed for the corr...

Page 57: ...address P O Box 24110 Lansdowne Cape Town 7779 Street address 47 Flamingo Crescent Lansdowne Cape Town 7780 info tabateq com www tabateq com Contact us for any additional information on these or any o...

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