SCSI Message Code
Encyclopedia
A SCSI Message Code is a computer term which defines how SCSI
devices send interface management information. The message code comprises one or more bytes.
SCSI
Small Computer System Interface is a set of standards for physically connecting and transferring data between computers and peripheral devices. The SCSI standards define commands, protocols, and electrical and optical interfaces. SCSI is most commonly used for hard disks and tape drives, but it...
devices send interface management information. The message code comprises one or more bytes.
List of SCSI Message Codes
| 00 | COMMAND COMPLETE |
| 01nnyy... | EXTENDED MESSAGE - nn is the length, yy is the extended message code |
| 010203ee | WIDE DATA TRANSFER REQUEST where ee is the transfer width exponent |
| 010301pprr | SYNCHRONOUS DATA TRANSFER REQUEST - where pp is the period and rr is the REQ/ACK offset |
| 010500aaaa | MODIFY DATA POINTER - where aaaa is added to the current data pointer |
| 01nn02... | |
| 02 | SAVE PTRS |
| 04 | DISCONNECT |
| 05 | INITIATOR DETECTED ERROR |
| 06 | ABORT |
| 07 | MESSAGE REJECT |
| 08 | NO OPERATION |
| 09 | MESSAGE PARITY ERROR |
| 0A | LINKED COMMAND COMPLETE |
| 0B | LINKED COMMAND COMPLETE (WITH FLAG) |
| 0C | BUS DEVICE RESET |
| 0D | ABORT TAG |
| 0E | CLEAR QUEUE |
| 0F | INITIATE RECOVERY |
| 10 | RELEASE RECOVERY |
| 11 | TERMINATE I/O PROCESS |
| 20 | SIMPLE QUEUE TAG |
| 21 | HEAD OF QUEUE TAG |
| 22 | ORDERED QUEUE TAG |
| 230i | IGNORE WIDE RESIDUE - where i is the number of bytes to ignore |
| 24-2F | Reserved for two-byte messages |
| 80-FF | IDENTIFY |