6 - 49
No. 99MBC095A
6. INTERFACE UNIT
6.2.4.4 Functions
The GP-IB interface functions include the following.
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TIP What is “serial poll” ?
• The controller which receives an SRQ (Service Request) will call the talkers that it
assumes are transmission sources. When the addressed talker transmits a status
byte (8-bit data) back to the controller to represent the talker condition, the control-
ler will check each byte to identify the source talker.
When the controller calls a talker for this purpose, it sends an SPE (Serial Poll
Enable) to the talker to discriminate from general addressing to the talker.
• SRQ status byte
In the serial poll state the GP-IB interface unit indicates the reason for issuing an
SRQ with the following bit contents:
bit0
(LSB)
bit6 bit1bit5 bit3 bit2bit4
00RSV 00000
0 RSV
Error No.010
01RSV GO00NG1
OK
ERROR
DATA
bit contents
Item
• RSV becomes “1” when this interface is in the service request state.
bit7
(MSB)
bit0
(LSB)
bit6 bit1bit5 bit3 bit2bit4
00RSV 00000
0 RSV
Error No.010
01RSV GO00NG1
OK
ERROR
DATA
bit contents
Item
