Host Interface Manual for use in the US •
Document Version 2.3 19 of
Frame structure is shown below.
Middle frame, when a message is divided into more than one frame.
[STX] FN text [ETB] CS1 CS2 [CR] [LF]
When the last frame in a message or a frame is a single frame.
[STX] FN text [ETX] CS1 CS2 [CR] [LF]
Field ASCII Code Content Character Note
[STX] 0x02 Start of text 1byte
FN Frame N 1byte 1
Text Communication data Max. 240 byte 2
[ETX]/[ETB] 0x03/0x17 End of text/end of communication block 1byte 3
CS1
Check sum
1byte
4
CS2 1byte
[CR] 0x0d Carriage return 1byte
[LF] 0x0a Line feed 1byte
Table 6: Frame structure
Note
1: 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.
2: 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 [ACK]0x06 [ACK]0x06 [ACK]0x06 [ACK]0x06
[DC3]0x13 [DC4]0x14 [NAK]0x15 [SYN]0x16 [ETB]0x17
3: When a message is 240 bytes or less, use [ETX]. When exceeding 240 bytes, use
[ETB].
4: Add each character code between and inclusive frame No.(FN) and [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.
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