buffer

The fields in the BSC block are as follows:

• PAD: An optional PADding character to alert the receiving device of the transmission of a block of data and to ensure that the receiving device is in sync with the data bits.

• SYN: SYNchronizing characters (usually two) establish character synchronization between the transmission and the receiving devices.

• SOH: A Start-Of-Header control character preceding the optional header.

• Header: An optional field of one or more octets of auxiliary data such as the addresses of the transmitting and receiving devices.

• STX: A Start-of-TeXt control character indicates the beginning of the data field.

• Text: Also known as the payload or data field.The text field can be up to 512 octets in length.

• ETX: An End-of-TeXt control character signaling the end of the data field.

• BCC: One of two Block Check Characters for error detection.

• EOT or PAD: An End-Of-Transmission character or PADding character trails the transmission to ensure the receipt of all previous characters and to indicate the end of the block.

See also ACK, BCC, block, byte-oriented protocol, data set, HDX, hexadecimal, NAK, octet, payload, and text field.

• Figure B-3
• Figure B-4
• Figure B-5
• Figure C-1
• Figure C-2
• Figure C-3
• Figure C-4
• Figure C-5
• Figure C-6
• Figure D-1
• Figure D-2
• Figure D-3
• Figure E-1
• Figure E-2
• Figure E-3
• Figure F-1
• Figure F-10
• Figure F-2
• Figure F-3
• Figure F-4
• Figure F-5
• Figure F-6
• Figure F-7
• Figure F-8
• Figure F-9