System sense field (SSENSE)

Bytes 0 and 1 contain one of the following values.

X'0800': The user sense field contains the user message from the user message table.
X'0819': The user sense field contains the IMS message number 290 (in binary). No output is available. This value is set only for a non-MFS response to a previously received RTR command.
X'0826': The user sense field contains the IMS message number.