I need to communicate through comm port with libra. I have communication protocol but I never did it and need help.

I wonder to use mscomm ole class.

Communication mod is 9600, 8N2 (solution is thisform.oleclass.settings = 9600, 8,N,2 ?)

I need to initialize libra with message contains characters
"#"
"J" - libra code
10-LF end of message (solution thisform.oleclass.output="#J"+CHR(10) ?)

To read mesurement from libra i need to sent to libra characters

"J" - libra code
“R” – read command
240 – F0h+0
240 – F0h+0
10 – LF end of message (solution thisform.oleclass.output= ????? I dont now what)

Libra should return
“J” – libra code
N – number, meaning lenght of varijable, in this case 7
N times two bytes which contains data, formatted like:
FHh = F0 hex (240) + hihger nibl of byte of message
FLh = F0 hex (240) + lower nibl of byte of message
(for example array 241, 243 decoding like 19)
next checksum byte on same way:
FHh – 240 + hihger nibl checksuma
FLh – 240 + lower nibl checksuma
[checksum calculates like: (libra code) xor (first byte of data) xor … xor (last byte of data)]
10 – LF end of message

Should I read thisform.oleclass.input ?? and how to translate what I get??

Structure of variabile zero (what ever is it) contains of 6 signs from display plus flags:
bit 0 (1) = unit kilogram
bit 1 (2) = unit gram
bit 2 (4) = out of range
bit 3 (8) = tara
bit 4 (16) = nett
bit 5 (32) = inaction
bit 6 (64) = zero
bit 7 (128) = unit tons

How to interpret this?

My idea is to have command button and when I click on it programm populate some field with value returned from libra.

Thanks in advance for help.

P.S. Maybe is my translation bad, sorry. I have protocol in Serbian language.