How do I Send & Receive HEX values via Serial?

DavidM

Hi

Now that I have my AERCOM AC4490-200M-02 Module working ( sort of??)

all the documentation for the commands are in HEX, so..

Q1) How to I send ( and receive ) HEX values via the EXTENDED_FDSerial Object??

for example I want to send

$CC C1 80 06 to my Aerocomm module

I know that some hex values can be converted to ascii , but some don't have keyboard equivalents ie. $CC is some kind of A with a line above it??

Q2) This command will also return HEX values as well, So How to I view the result as HEX on my LCD? ( I am using a string pointer variable)

Q3) Ideally I want to create CONSTANTS for my HEX Commands , Is this done with a DAT declaration?

eg..

EnterATCmdMode := $41, $54, $2B, $2B, $2B, $0D
ExitATCmdMode := $CC, $41, $54, $4F, $0D


Thanks

Dave M

Peter Jakacki

Dave,

Remember that hex is just a way of representing the bytes that are transmitted for us humans to read, it's all 1's and 0's at the end of the day. If I said that the Aerocomm had to receive 01000001 you might scratch your head. If I said it had to receive A you might still scratch your head. If now I say that you have to send $41 in this manner ---> Serial.tx($41) then you would type that in exactly like that and it would work. So would Serial.tx(%01000001) and so would Serial.tx("A") as they all do the same thing. I've included a short demo code snippet and the "hex" output, notice the two "HELLO" strings as well as the two "AT+++" strings that were compiled.

*Peter*

obj
  serial: "Extended_FDSerial"
  
pub demo
  serial.tx($41)                                   'sends out the character "A"
  serial.tx("A")
  
  serial.str(string("HELLO"))                      'sends out "HELLO"
  serial.str(string($48,$45,$4C,$4C,$4F))          ' same

  serial.str(string($41, $54, $2B, $2B, $2B, $0D)) 'forces modem to enter command mode
  serial.str(string("AT+++",$0D))                  

  serial.str(string($CC, $41, $54, $4F, $0D))      ' exit command mode  
  serial.str(string($CC, "ATO", $0D))              ' exit command mode  
  
  

 00000000  00 1B B7 00  00 8E 10 00  AC 06 0C 07  1C 00 10 07  ················
 00000010  6C 00 02 01  0C 00 00 00  6C 00 00 00  01 38 41 06  l·······l····8A·
 00000020  02 05 01 38  41 06 02 05  01 87 80 43  06 02 08 01  ···8A······C····
 00000030  87 80 49 06  02 08 01 87  80 4F 06 02  08 01 87 80  ··I······O······
 00000040  56 06 02 08  01 87 80 5D  06 02 08 01  87 80 63 06  V······]······c·
 00000050  02 08 32 48  45 4C 4C 4F  00 48 45 4C  4C 4F 00 41  ··2HELLO·HELLO·A
 00000060  54 2B 2B 2B  0D 00 41 54  2B 2B 2B 0D  00 CC 41 54  T+++··AT+++···AT
 00000070  4F 0D 00 CC  41 54 4F 0D  00 00 00 00  8C 03 12 01  O···ATO·········
 00000080  4C 00 00 00  55 00 00 00  5A 00 00 00  60 00 00 00  L···U···Z···`···
 00000090  65 00 00 00  6B 00 00 00  71 00 00 00  78 00 00 00  e···k···q···x···
 000000A0  7E 00 00 00  84 00 00 00  8B 00 00 00  92 00 0C 00  ~···············
 000000B0  1B 01 10 00  BB 01 10 00  60 02 10 00  07 03 04 00  ········`·······
 000000C0  3D 03 08 00  8C 03 10 00  01 64 68 6C  70 06 12 01  =········dhlp···

DavidM

Hi Pete,

Thanks for the clear explanation

I guess all I needed to know was the SYNTAX for the multiple hex values, I did not know that the string function handles it this way,

i.e

STRING( $FF, $FF, $FF, $FF, $FF, $FF, $FF, $FF )

and also combining different data types

e.g.

Hex, Alpha and numeric..

STRING( $FF, "HELLO", 13 )


This is not mentioned in the manual for the string function. (PAGE 310 )

Thanks

Dave M