BS2P40 baud rates

littlerich

I know there is a document that gives the codes for setting up serial data and I cannot find it.

I have a couple of RF modules and have had them going previously but today all I get is garbage.

Currently just trying to receive the data in a windows application that came with the transmitters. (Technically they are transceivers)

Think I have proved everything else is working:
remove TX pin from stamp = no data received
change data to a small string and small string of data is received
data in a loop so same garbage repeating.

I can only think I have accidentally messed up the serial command.

The only other thing to change is I went from ver 2.3.0 to 2.3.9 of Parallax software
Also I am using the same computer to setup Stamp, disconnect software and open monitoring application on receiver. So having to shut software between attempts. Com port seems to be coping with this however I haven't ruled out Com port confusion.

Well I am confused anyway.

Extract from program below:

' {$STAMP BS2p}
' {$PBASIC 2.5}

Turbine1_Rot VAR Word ' could be more than 255rpm so used word and can be 0 to 65535

Radio_Tx CON 14 'Radio on pin
Radio_Baud CON 240 'Radio baud 9600 8-N-1

x VAR Byte
y VAR Byte

Main:

x = 10
y = 20
DO
x = x+1
y = y+2
GOSUB Radio_update
LOOP
END

' Subroutines

Radio_update:
PULSOUT Radio_Tx, 1200 'set pin high to be a serial port
SEROUT Radio_Tx, Radio_Baud, [noparse][[/noparse]"hello richard "]
'SEROUT Radio_Tx, Radio_Baud, [noparse][[/noparse] DEC(x), " " ]
'SEROUT Radio_Tx, Radio_Baud, [noparse][[/noparse] DEC (y), " " ]
'SEROUT Radio_Tx, Radio_Baud, [noparse][[/noparse]"hello saskia "]
PAUSE 1250
RETURN

As you can see i have commented out several lines anyway from the data to be transmitted.

Mike Green

As is true for almost all Parallax products, the links to the documentation and examples can be found on the webstore page for the product. The 433MHz units' documentation can be found here: www.parallax.com/Store/Accessories/Communication/tabid/161/CategoryID/36/List/0/Level/a/ProductID/111/Default.aspx?SortField=ProductName%2cProductName.

The Baud constant you gave should be correct for 9600 Baud on a BS2p. If you're not using Parallax's modules, there may be other issues.

Zoot

Use this code in all of your Stamp programs and you'll be ready-to-go with Baud rates without having to look up the values for each flavor of Stamp

#SELECT $STAMP                                        ' Baud rates
  #CASE BS2, BS2E, BS2PE
    T1200       CON     813
    T2400       CON     396
    T4800       CON     188
    T9600       CON     84
    T19K2       CON     32
    TMidi       CON     12
    T38K4       CON     6
  #CASE BS2SX, BS2P
    T1200       CON     2063
    T2400       CON     1021
    T4800       CON     500
    T9600       CON     240
    T19K2       CON     110
    TMidi       CON     60
    T38K4       CON     45
  #CASE BS2PX
    T1200       CON     3313
    T2400       CON     1646
    T4800       CON     813
    T9600       CON     396
    T19K2       CON     188
    TMidi       CON     108
    T38K4       CON     84
#ENDSELECT

SevenBit        CON     $2000
Inverted        CON     $4000
Open            CON     $8000


'e.g
MyBaud CON T38K4+Open ' will give you correct 38K4 open true value for any Stamp

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littlerich

Thank you very much.
Hopefully I'll have sorted soon.