Tektronix MTD200 User Manual page 154

Use of the Status
Reporting System
MTD200 MPEG Test Decoder User Manual
Table 5–11: Definition of bits used in the STATus:QUEStionable:DVMD
Register (cont.)
Bit No. Definition
5 PIDE
This bit is set if a PID error is indicated in the MONITORING/STATISTICS menu.
6 TPEE
This bit is set if a TRANSPORT error is indicated in the MONITORING/STATISTICS
menu.
7 CRCE
This bit is set if a CRC error is indicated in the MONITORING/STATISTICS menu.
8 OTHER
This bit is set if an error is indicated in the MONITORING/STATISTICS menu for
the parameters not mentioned above.
For an efficient use of the status reporting system, the information contained
therein has to be transferred to the controller program and further processed.
There are various methods which are described in the following. Detailed
program examples are given in Program Examples on page 5–68.
Service Request and Use of Hierarchical Structure. Under certain conditions, the
instrument may send a service request (SRQ) to the controller. This service
request usually causes an interrupt at the controller to which the controller
program can respond by suitable action. As shown in Figure 5–4 on page 5–52,
an SRQ will always be triggered if one or several of the bits 2, 3, 4, 5, or 7 have
been set in the Status Byte Register and enabled in the SRE. Each of these bits
combines the information from a further status register, from the error queue, or
the output buffer. By setting the ENABle registers of the status registers
accordingly, it is possible that any bit in any status register will be able to trigger
a SRQ. To utilize the possibilities of the service request, the corresponding bits
in the enable registers must be set to "1".
The use of baud rates of less that 9600 requires special measures to avoid loss of
data.
The RS-232 interface with the controller needs to be rated for these baud
rates.
The controller must be able to process the received data in time.
To synchronize data transmission, hardware handshaking must be used.
Remote Control
5–57