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DIO1 — DIO8 Data Input/Output — These are inverted data lines that conform to IEEE specification
IEEE-488. When ATN is low, these lines contain interface commands. When ATN is high,
these lines contain data.
EOIn End or Identify — If ATN is high, a low on this line marks the end of a message block. If
ATN is low, a low on this line requests a parallel poll.
IFCn Interface Clear — This line goes low to halt all current operations on the bus, unaddress all
other devices, and disable serial poll. The system controller becomes the controller in charge.
This line is only used during the analyzer’s developement.
NDACn Not Data Accepted — This line goes high when the DIO lines have been latched by
the acceptor.
NRFDn Not Ready for Data — This line goes high when the acceptor is ready to accept data.
RENn Remote Enable — This line is low when the GPIB has control and high during local operation.
SRQn Service Request — This line is low when a device on the GPIB needs service.
Serial Port
The following table lists signals at the Serial Port connector (A10 J101). The Serial
Port is a 9-pin EIA-574 port that is only available using Instrument Basic. A
description of each signal follows the table.
Signal Name
Pin
DSR
6
DTR
1
RTS
4
RxD
3
TxD
2
Logic Gnd
7
Not Used
5, 8-9
DSR Data Set Ready — Some devices check this line for a high to verify that the analyzer is
connected and ready. The user can set this line high or set this line to go high only when the
analyzer is ready for data transfer.
DTR Data Terminal Ready — This line is tied high. Some devices check this line for a high to
verify that the analyzer is connected and ready.
RTS Request To Send — This line is tied high. Some devices require this line to be high before
transferring data.
RxD Receive Data — This is the serial EIA-574 receive data line. This line transmits data from
peripheral devices one byte at a time.
TxD Transmit Data — This is the serial EIA-574 transmit data line. This line transmits data to
peripheral devices one byte at a time.
Agilent 35670A Voltages and Signals
A10 Rear Panel
9-15