Anritsu MP1777A - Manual (Page 119)

B.1 Initializing Bus
IFC: Initializes functions of all the devices connected to the GPIB bus line, when the GPIB option is
mounted.
Initialization of the interface function refers to an action of canceling the status of the interface function
of the device set by the controller and returning it to the initial status. Each function marked with a
check mark (vi) in the table is initialized. The function marked with a delta (A) means that the function
will be partially initialized. This command has no effects on the operation status of the device.
Table B-1 Changes in Status of Interface Functions by IFC Message
Appendix B Details of Initialization Command Functions
No. Function Cord Initialization by IFC
I Source handshake SH V
2 Acceptor handshake AH V
3 Talker or extension talker T orTE
4 Listener or extension listener L or LT V
5 Service request SR A
6 Remote local RL
7 Parallel port PP
8 Device clear DC
9 Device trigger DT
10 Controlle C V
The following table shows changes in status of the device by the IFC message.
Table B-2 Changes in Status of Device by IFC Message
IFC Message Changes in Status of Device
Talker/Listener All the talkers and listeners switch into the idle state (TIDS and LIDS) within 100 ps.
Controller Unless the controller is active (SACS: System control ACtive State), the controller switches
into the idle state (CIDS: Control IDle State) within 100 ps.
Device of service request Although the state where the device is sending an SRQ message to the controller (state
where the SRQ line is set by the device to the LOW level) is not canceled, the message
cancels the state where the controller have all the devices under the system bus in the serial
pole mode.
Device in remote mode Devices currently in the remote mode will not be released from the remote mode by the IFC
message.
B-2
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