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Reference
3Ć116
Remote Communication
You may want to integrate your oscilloscope into a system environment and
remotely control your oscilloscope or exchange measurement or waveform
data with a computer. You can control your oscilloscope remotely via the
IEEE Std 488.2-1987 (GPIB) interface.
GPIB enables data transfers between instruments that support the GPIB
protocols. It provides:
H Remote instrument control
H Bidirectional data transfer
H Device compatibility
H Status and event reporting
Besides the base protocols, Tektronix has defined codes and formats for
messages to travel over the GPIB. Each device that follows these codes and
formats, such as the TDS 620A, TDS 640A, & TDS 644A, supports standard
commands. Use of instruments that support these commands can greatly
simplify development of GPIB systems.
GPIB Interface Requirements
You can connect GPIB networks in many configurations if you follow these
rules:
H No more than 15 devices, including the controller, can be on a single
bus.
H Connect one device load every two meters (about six feet) of cable
length to maintain bus electrical characteristics. (Generally, each instruĆ
ment represents one device load on the bus.)
H The total cumulative cable length must not exceed 20 meters (about
65 feet).
H At least twoĆthirds of the device loads must be turned on when you use
your network.
H There must be only one cable path from each device to each other
device on your network (see Figure 3Ć59), and you must not create loop
configurations.
GPIB Protocol