Tektronix 071-0590-00 user manual Gpib Numeric Responses, Gpib Status Reporting, Status Byte

Using GPIB, RS-232

query command. The GB1400 responses commands will be either character mnemonics (for example, INT or EXT) or numerics (Example: 200.0).

GPIB Numeric Responses

When responding with a numeric, the receiver specifies it as one of the following types:

<NR1 Numeric>:	decimal integer
<NR2 Numeric>:	decimal real number without exponent
<NR3 Numeric>:	decimal real number with exponent
<Non-decimal Numeric>:	non-decimal number with leading #H (Hex), #Q
	(Octal), #B (Binary) and always in the range of 0
	to 255 decimal (for example, #H55)

GPIB Status Reporting

There is a status reporting function provided for the GPIB interface, which is based on the SRQ (Service Request) and is defined in the ANSI/IEEE standard 488.2-1987. The implementation used by GB1400 for status reporting includes one additional register from what is specified within the IEEE-488.2 standard.

Status Byte

There is a status byte which is used to define the SRQ status. The individual bits within the status byte represent the different conditions which might cause the request for service defined as follows:

Bits 1 to 3	Unused
Bit 4	(TSB) Test	This is a summary of Test Event Status
	Event Status	Byte. It will be set whenever an enabled
	Bit	Test event condition occurs
Bit 5	(MAV)	Set whenever there is output available for
	Message	the controller
	Available Bit
Bit 6	(ESB)	This is the summary of the Standard Event
	Standard	Status Byte. It will be set whenever an
	Event Status	enabled standard event condition occurs
	Bit
Bit 7	(MSS) Master	This is the Master Summary Status. It is a
	Summary	summary of the status byte, so that
	Status Bit	whenever one of the bits (TSB, MAV or
		ESB) is set and it is also enabled (by the
		Service Request Enable byte), the MSS bit
		will set
Bit 8	Unused

GB1400 User Manual D-3