ayuda con recibir fichero texto por RS-232

[rusadir]

Adjunto pongo el txt bajado de metrologic sobre el que estoy trabajando
con el protocolo del terminal para recibir fichero de datos y el protocolo de subir datos,

Por si alguien se anima y me hecha una manita,


Je Je Je,

Un Saludo, Rusadir


Fichero txt:

****************************************************************************
***** Protocol for downloading lookup files to ScanPal2 terminals *****
****************************************************************************
Note : All commands or records sent to /or received from the ScanPal2
terminals should be ended with a return character (0x0d).
1. Send the "CIPHER" command to ScanPal2 terminal and wait for return.
2. If the terminal returns "ACK", then it is ready for receiving lookup data
from the PC.
3. Send lookup data to terminal record by record. Each record should be ended
with 2 bytes of checksum. The checksum is calculated according to the
following rules:
A. Sum up the record data byte by byte.
B. Devide the sum by 256 to get the first byte checksum value. If this
value happens to be 13 (the return character: 0x0d), change it to 14
(0x0e).
C. The remaining of the above calculation is the second byte checksum
value. If it happens to be 13, change it to 14.
4. If the terminal returns "ACK", send next record to the terminal,
otherwise, re-send the same record to the terminal. Repeat the same
procedures until all the data is successfully transmitted.
5. Send the "OVER" command to the ScanPal2 terminal to stop this communication.

****************************************************************************
***** Protocol for receiving transaction data from ScanPal2 terminals *****
****************************************************************************
Note : All commands or records sent to or received from the ScanPal2
terminals should be ended with a return character (0x0d).
1. Send the "READ" command to the ScanPal2 terminal and wait for return.
2. If the terminal returns "ACK", then it is ready to send data to PC.
3. The format of each record received from the terminal is as follows,
A. The first byte is a sequence count rotated from 0 to 9. It's purpose
is to ensure the correct order of data transmission.
B. The last two bytes are the checksum values. The checksum is calculated
by adding up the sequence count and all the data bytes.
C. Devide the sum calculated above by 256 will get the last byte checksum
value. If this value happens to be 13 (the return character: 0x0d),
change it to 14 (0x0e).
D. The remaining of the above calculation is the first byte checksum
value. If it happens to be 13, change it to 14.
E. Please note that the checksum byte-order for this protocol is different
to that of downloading lookup files.