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 805U Radio Modem  Module

 User Manual

Page 

36

©

   November 2004

DTR Control

The DTR signal on the RS232 port can be used for
different functions in controlled mode:

!

 

“Ignore DTR”  -  the DTR signal does not perform
any function

!

 

“Command Mode”  -  if the host resets DTR,  the
805U will go into command mode  -  when DTR is
activated,  the module will revert to on-line mode

!

 

“Command Mode, Disconnect”  -  as above except
that the module will also force a disconnection of the
communications link

!

 

“Low Power, Disconnect”  - when the host resets
DTR,  the module will disconnect the link and go to
low power mode.  If you select the “Low Power”
option in the Controlled Mode page,  this 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 always connected
in transparent mode.

!

 

“Always On”  -  the 805U sets the DCD to be always on

!

 

“Only High When Connected”  -  the DCD signal will be on when the link is connected
and off when the link is reset

!

 

“Pulse Low on Disconnect”  -  the DCD signal will be normally on but will switch off
momentarily (for 0.1 sec) when the link is reset.

Advanced Settings

These settings may be adjusted if the host device is using AT commands  -  refer to Appendix
A for an explanation of the different parameters.

S Registers

These are parameter registers settable by AT commands.  They do not normally need to be
changed.  Refer to Appendix A for an explanation of these parameters.

Содержание 805U

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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