Exchange/RJE Manual

RECEIVE Command
Exchange/RJE Commands
3–42 104698 Tandem Computers Incorporated
Table 3-6. Block Mode Without Blocking RECEIVE Command Block Formats
Normal-Text Block Format
All blocks except last: STX record ETB
Last block: STX record ETX
Maximum block size 4086 bytes (includes 1 byte each for STX and ETB/ETX)
Maximum record size: BLOCKSIZE for the print file
80 bytes for the punch file
Records cannot contain any BSC control characters. Block mode without blocking treats each block
received as a single record. It does not support the use of ITB or IRS characters as record separators
within a block.
Transparent-Text Block Format
All blocks except last: DLE STX record ETB
Last block: DLE STX record ETX
Maximum block size: 4087 bytes (includes 1 byte each for STX and ETB/ETX)
Record size: BLOCKSIZE, fixed-length, for the print file
80 bytes, fixed-length, for the punch file
Records can contain any character (bit pattern).
Note that for transparent-text block format, all DLEs other than the first DLE are
deleted from the received data by the underlying communications subsystem.
Therefore, these DLEs do not appear in Exchange/RJE trace data (or in a data file
written when RAWDATA is specified). (A DLE as data is sent as DLE DLE, and only
the first DLE is removed.)
Exchange/RJE disassembles the blocks into individual records and then writes the
records one at a time to the specified file.