Quantum Data 881 User Manual page 443

882 Video Test Instrument User Guide (Rev A.35)
S 03-- 83+- End signal free time: 42.47msec.
S 3F-+ 84-+ 10-+ 00-+ 03++ End signal free time: 41.57msec.
2. Query the bus monitor for particular messages
CEC1:BUSM:MSGX? -3
The response will be:
S 3F-+ 84-+ 10-+ 00-+ 03++ End signal free time: 41.57msec.
CEC1:BUSM:MSGX? 1
The response will be:
S 03-- 83+- End signal free time: 42.47msec.
Query the bus monitor for bit timing errors and bit values
You can query the bus monitor for the number of bits, bit timing, bit timing errors as well as
the value of a specific bit.
To query the number of bit values in the bus monitor buffer:
1. Query the bus monitor for bit timing errors by entering the following command:
CEC1:BUSM:NBIT?
A typical response might be:
200
To query the bus monitor for bit timing errors:
1. Query the bus monitor for bit timing errors by entering the following command:
CEC1:BUSM:CHEK?
A typical response might be:
2
The range of responses are:
0 - no error has occurred
1 - an error has occurred in a one (logical 1) bit
2 - an error has occurred in a zero (logical 0) bit
4 - an error has occurred in a start bit
8 - an unknown error has occurred
To query the bus monitor for the timing of a series of bits in the buffer:
1. Query the bus monitor for the timing of a series of bits by entering the following
command:
// Queries for message that occurred three
messages ago
// Queries for 5th message in the buffer
// Queries buffer for the number of bits
// Indicates there are 200 bits in the buffer
// Queries buffer for bit timing errors
// Indicates that a logical 0 bit error occurred
101