If an invalid command is received from the HOST, the peripheral should respond with AFH for
NACK. Invalid commands are defined as:
• illegal command code
• unexpected data byte (not proceeded by appropriate command)
• new command received before previous data transmission completed
• data transmission not completed within specified time limit
• H/W ACIA error, i.e. overflow, frame error, etc.
Each peripheral should have a Communications Status Byte as follows:
Remote Communication Status:
(See diagram on page 41)
Bit 0
1 - ILLG
illegal command code
0 - OK
Bit 1
1 - UNEXP
unexpected data byte (not proceeded
by appropriate command)
0 - OK
Bit 2
1 - NEW
new command received before
previous data transmission completed
0 - OK
Bit 3
1 - TIME
data transmission not completed within
specified time limit
0 - OK
Bit 4
1 - COMERR H/W ACIA
error, i.e., overflow, frame error, etc.
0 - OK
Bit 5
1 - HWFLT
system hardware fault is disabling
function or system is in diagnostic
mode
Bit 6
1 - RANGE
data out of range
0 - OK
Bit 7
0
data transmission, B7 MUST BE ZERO!
System Status Byte 1:
The lower control board error codes:
Bit 0
No Hall Effect Speed Signal
Bit 1
Hall Effect Overspeed Error
Bit 2
Tach Overspeed Error
Bit 3
No Speed From Tach
Bit 4
Grade Potentiometer Out of Range
Bit 5
Amplifier Fault Detect
Bit 6
Safety Lanyard Pulled Off
Bit 7
Communication Fault
CONTENTS
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BASIC OPERATION OF THE RTM 400
Summary of Contents for 950-273
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