Diagnostics and troubleshooting
 
249
 
Engine experiencing unreliable 
communication with the specified device.
 
Note: 
<
device
> can be one of the following:
 
• 
Tray 2
 
• 
Tray 3
 
• 
Tray 4
 
See 
“Options communication error 
service check” on page 251
.
 
 
Engine protocol violation detected by the 
specified device.
 
Note: 
<
device
> can be one of the following:
 
• 
Tray 2
 
• 
Tray 3
 
• 
Tray 4
 
Communications error detected by the 
specified device.
 
Note: 
<
device
> can be one of the following:
 
• 
Tray 2
 
• 
Tray 3
 
• 
Tray 4
 
Invalid command received by the specified 
device.
 
Note: 
<
device
> can be one of the following:
 
• 
Tray 2
 
• 
Tray 3
 
• 
Tray 4
 
Invalid command parameter received by the 
specified device.
 
Note: 
<
device
> can be one of the following:
 
• 
Tray 2
 
• 
Tray 3
 
• 
Tray 4