Omega Vehicle Security 1400 User Manual

Registers, Data Formats, & Queries

ChartScan User’s Manual

C-15

 

 The acquisition device sets the Message Available bit (MAV) in the Status Byte Register to determine if data
can be read by the controller.  This is the only status reporting register which requires RS-232 interface users to
use a different read command than IEEE 488 interface users.
 The status byte register contains the following active bits:
 

 

 

 

 

 

 

1

 

Alarm

 

 

2

 

Trigger Detected

 

 

4

 

Ready

 

 

8

 

Scan Available

 

 

16

 

Message Available

 

 

32

 

Event Status Register Bit (ESB)

 

 

64

 

Service Request Bit

 

 

128

 

Buffer Overrun

 
 All bits in the serial poll status byte register are cleared by either a 

*R

 command, that returns ChartScan to its

power-up default conditions, or a read of the serial poll status byte register via the Status command 

U1

.  The

ESB in the Serial Poll Status Register is also cleared by these operations.  The Command Error, Execution Error
and Device Dependent Error are also cleared with an Error Query (

E?

) command.