Roche/Hitachi cobas c 311 analyzer ASTM communication protocol
Frame Structure
Roche Diagnostics May 2011
Host Interface Manual – Version 1.3 D-3
Frame Structure
Frame structure is shown below.
- Middle frame when a frame is divided into more than one.
[STX] FN text
[ETB]
CS1 CS2 [CR] [LF]
- When the last frame or a frame is single frame.
[STX] FN text
[ETX]
CS1 CS2 [CR] [LF]
Field ASCII Code Content character Note
[STX] 0x02 Start of Text 1byte
FN - Frame No. 1byte 1
text - Communication data Max240byte 2
[ETX]/[ETB] 0x03/0x17 End of Text/ End of Communication Block 1byte 3
CS1 - 1byte
CS2 -
Check Sum
1byte
4
[CR] 0x0d Carriage Return 1byte
[LF] 0x0a Line Feed 1byte
*Note1: Way to assign frame No. (FN) is starting from No.1 to
No.7. When exceeding No. 7, start from No.0 to No.7.
*Note2: Codes except the following ASCII code are available
for text.
Code Code Code Code Code
[SOH]0x01 [STX]0x02 [ETX]0x03 [EOT]0x04 [ENQ]0x05
[ACK]0x06 [LF]0x0A [DLE]0x10 [DC1]0x11 [DC2]0x12
[DC3]0x13 [DC4]0x14 [NAK]0x15 [SYN]0x16 [ETB]0x17
*Note3: When a frame is 240 bytes or less, use [ETX].
When exceeding 240 bytes, use [ETB].
*Note4: Add each character code which frame No. is (FN) to
[ETB] or [ETX]. Display the sum in hexadecimal format.
Convert the last two digits into ASCII code. Code used for
Check Sum is ’0’ to ’9’ and ’A’ to ’F.’
Ex. Check Sum Calculation Method
[STX] ‘1’ ‘T’ ‘e’ ‘s’ ‘t’ [ETX]
Field Character Hex.
format
Sum
[STX] [STX] 02h -
FN ‘1’ 31h 31h
‘T’ 54h 85h
‘e’ 65h EAh
‘s’ 73h 15Dh
text
‘t’ 74h 1D1h
[ETX] [ETX] 03h
1D4
h
Last two digits of the sum. D4h
CS1
‘D’ 44h
CS2
‘4’ 34h
[CR] 0Dh
[LF] 0Ah
[STX] ‘1’ ‘T’ ‘e’ ‘s’ ‘t’ [ETX]
‘D’ ‘4’
[CR] [LF]
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