Host-Initiated Communications Protocol; Error Codes (Erc; Matrix-Initiated Communications Protocol; Timing - Extron electronics Matrix 200 User Manual

Appendix B • Programming Guide

Host-Initiated Communications Protocol

Error Codes (Erc)

Erc
80h
90h
Erc see command
C0
C3
C6
C9
CC
CF
D2

Matrix-Initiated Communications Protocol

Timing

Extron • Matrix 200 • User's Manual
Most of the information transfer activity is initiated by a Host system through a
control port. For example, the Host can send Commands to the Matrix to request
data from or send data to the Matrix 200. After receiving a command, the Matrix
200 executes it and sends back a Response to the Host. The Response includes
an error code together with any requested data.
The Response includes the original Command code. Its format is as follows:
1. Command code
2. Error code
3. Data (if any)
4. Checksum
5. End of transmission mark EOT
The error code is usually bit-encoded and follows the data format (bit-7 always
"1" to indicate a data byte). An error code of 80 (hex) indicates "no error". Other
error codes specify the reason for not properly executing a command. The first
error condition encountered will determine the error code. The following list has
Erc codes that could occur in response to any command, and others that are
associated with specific commands. (See command for description.)
description Erc
no error (normal) 81h
no I/O boards 91h
Erc
CMD7 C1
CMD10 C4
CMD14 C7
CMD1 CA
CMD16 CD
CMD18 D0
CMD35 D3
Sometimes, under abnormal conditions, the Matrix 200 may detect a situation
that must be reported to the Host. For example: Auxiliary power supply is
activated, memory error, backup battery must be replaced, etc. These Matrix
Reports are listed and explained later. They have the same general command
format as the Host-initiated commands, but no response is expected from the
host.
When Commands are sent to the Matrix 200 switcher, the response is delayed
due to normal processing time. The response time has two components: RS-232/
RS-422 bus delay and Matrix 200 processing time. Matrix 200 processing time is
variable, depending on the length of the command and the matrix size.
Response time is usually less than 100 msec.
CMD byte (plus SCMD for some commands)
Erc (see list)
Cks
description Erc description
checksum error 82h illegal command
system mismatch 92h security code error
see command Erc
CMD8 C2
CMD23 C5
CMD16 C8
CMD16 CB
CMD18 CE
CMD18 D1
CMD1 D4
see command
CMD11
CMD14
CMD16
CMD16
CMD18
CMD20
CMD36/37
B-6