biodex 950-275 Installation & Operation Manual page 17

CONTENTS
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
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
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
1 - ILLG
0 - OK
1 - UNEXP
0 - OK
1 - NEW
0 - OK
1 - TIME
0 - OK
1 - COMERR H/W ACIA
0 - OK
1 - HWFLT
1 - RANGE
0 - OK
0
— 17 —
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
error, i.e., overflow, frame error, etc.
system hardware fault is disabling
function or system is in diagnostic
mode
data out of range
data transmission, B7 MUST BE ZERO!
BASIC OPERATION OF THE RTM 400