Exchange/RJE Manual

SEND Command
Exchange/RJE Commands
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Table 3-10. Block Mode, 2780 Blocking SEND Command Block Formats
Normal-Text Block Format
All blocks except last: STX record [ ITB record ]... ETB
Last block: STX record [ ITB record ]... ETX
Maximum block size: 4086 bytes (includes 1 byte each for STX and ETB/ETX)
Maximum record size: BLOCKSIZE
Records less than 80 bytes in length have an EM character appended to them unless you specify
DROPEM in the SEND command.
Records cannot contain any BSC control characters.
Transparent-Text Block Format
All blocks except last: DLE STX record [ record ]... ETB
Last block: DLE STX record [ record ]... ETX
Maximum block size: 4087 bytes (includes 1 byte each for DLE, STX, and ETB/ETX)
Record size: 80 bytes, fixed-length, for all files
Records can contain any character (bit pattern).
Note that for transparent-text block format, all DLEs other than the first DLE are
inserted in the block by the underlying communications subsystem. Therefore, these
DLEs do not appear in Exchange/RJE trace data. (A DLE as data is sent as DLE DLE.
The additional DLE is inserted by the underlying communications subsystem.)