Model 350AH1A
Rev B
15
2.6 REMOTE COMMUNICATIONS
This section describes remote operation of the model 350AH1A using the provided General Purpose Interface
Bus (GPIB), RS-232, Fiber-Optic Serial, Universal Serial Bus (USB), and Ethernet ports connected to a
remote device such as a personal computer. All ports are active at all times, however only one port may be
used at a time. Communicating through two or more ports at one time will cause data collisions and lost
commands or queries.
The Keylock switch on the control panel of the model 350AH1A allows it to be controlled using remote
communications. All remote queries will work in any Keylock switch position, but all remote commands will
only work when the position is set to REMOTE. When the Keylock switch is set to REMOTE all front panel
controls are disabled unless otherwise specified.
2.6.1
IEEE-488 (GPIB) Communications
For GPIB operation, the device address is set using the front panel touch screen. Ensure that each device
connected to the GPIB is set to a unique address.
To send commands be sure that the model 350AH1A’s address is set properly and that the controller has
correctly identified it as a “listening” device.
When sending commands via the GPIB interface, terminate with an EOI, a Line Feed character or both. The
350AH1A will ignore characters following the termination.
2.6.1.1
Setting the IEEE-488 (GPIB) Address
The GPIB device address can be set to any number between 1 and 30. This selection is made by navigating to
the GPIB address selection screen. To get there from the Main Menu, touch the User menu button followed
by the I/O menu button and finally the GPIB menu button. Touching any of the buttons labeled 1 to 30
immediately sets the GPIB address to the corresponding value. A thin black outline indicates the present
GPIB address selection. When the back button is pushed the address selection is stored to non-volatile
memory. Therefore, if power is lost prior to hitting the back button, any address selection changes will be lost.
The default GPIB address is 1.
Table 2-1. IEEE-488 Address Selection
Device Address
Switch 5
Switch 4
Switch 3
Switch 2
Switch 1
1
off (0)
off (0)
off (0)
off (0)
on (1)
2
off (0)
off (0)
off (0)
on (1)
off (0)
3
off (0)
off (0)
off (0)
on (1)
on (1)
4
off (0)
off (0)
on (1)
off (0)
off (0)
5
off (0)
off (0)
on (1)
off (0)
on (1)
:
30
on (1)
on (1)
on (1)
on (1)
off (0)
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