112
the controller has read it. When the strings or command has been sent it must
be terminated with LF=(0AH), such as ”TEST”+LF.
9.2
GPIB Interface
9.2.1 GPIB Connector
Connection is usually accomplished with a 24-conductor cable with a plug on one
end and a connector at the other end. Devices may be connected in a linear,
star or a combination configuration.
The standard connector is the Amphenol or Cinch Series 57 Microribbon or AMP
CHAMP type. The GPIB uses negative logic with standard transistor-transistor
logic (TTL) levels. When DAV is true, for example, it is a TTL low level (
0/8 V),
and when DAV is false, it is a TTL high level (
2.0 V).
Restrictions and Limitations on the GPIB
A maximum separation of 4 m between any two devices and an average
separation of 2 m over the entire bus.
A maximum total cable length of 20 m.
No more than 15 device loads connected to each bus, with no less than two-
thirds powered on. For example 1 GPIB controller and a maximum of 14
GPIB instruments.
Note:
A bus extender, which is available from numerous manufacturers, is
available to overcome these limitations.
9.2.2 GPIB Address
Each device on the GPIB (IEEE-488) interface must have a unique address. You
can set the address of the 300XAC to any value between 0 and 30. The address
can only be set from the front panel. The address is stored in non-volatile
memory and does not change when the power has been off or after a remote
reset.
The address is set to 8 when the instrument is shipped from the factory.
9.3
Interface Functions
The capability of a device connected to the bus is specified by its interface
functions. These functions provide the means for a device to receive, process,
and send messages over the bus. The interface functions are listed in the chart
Summary of Contents for 00310XAC
Page 16: ...10 310XAC 320XAC...
Page 24: ...18 Accuracy L 0 1 Hz 0 0 500 Hz H 0 2 Hz 501 1000 Hz...
Page 26: ...20 A...
Page 36: ...30...
Page 101: ...95 move back to the test screen...
Page 108: ...102...
Page 127: ...121 CONNECT CONNECT 0 1 0 1...
Page 130: ...124 Register...
Page 138: ...132...
