Specifications

MODEL 370 REV: D Page 8 of 26
Display Illumination: Turns the display back light on or off.
3.2 IEEE-488 Interface
3.2.1 The IEEE interface allows communications between the instrument,
a talker/listener, and a controller such as a Hewlett Packard desk top
computer equipped with the HPIB interface or any system with an
IEEE-488 interface.
As a listener, the instrument terminates communication when ASCII
line feed (LF) or end or identify (EOI) is received. Carriage return,
commonly sent by HP systems is received and ignored.
Talking is terminated with CRLF, EOI is sent with the last character.
3.2.2 Device Address
The Device address is factory set to address code 04. The address
code may be changed by resetting dip switch 1 (IEEE address SW1)
accessed through the rear panel. Then resetting is accomplished by
turning the power off and the on again after the display has gone
blank. The address is determined by converting the desired address
(0 to 31) to a binary number. For example, the binary value for the
factory-set address of 4 is 001000. Use the tip of a pen or a small tool
to set the switches.
3.2.3 IEEE Control Codes
The following codes sent via the IEEE bus set the instrument
functions. The codes perform the same functions as obtainable from
the front panel except that Up/Down key presses are replaced with
numbers representing the desired values.
IEEE bus commands “LLO”, “GTL”, and “SDC” may also be sent to
set the instrument in local lockout (front panel controls disabled) and
go to local (front panel controls enabled), and send device clear.
Local lockout is useful to prevent interference with bus operation by
accidental contact with the front panel.
3.2.4 Typical Bus Operation
The following examples indicate typical operation of the IEEE bus
using a HP-85 computer. Characters are interpreted from left to right
and are set as upper case ASCII character strings.
OUTPUT 704 ; “K3W700M7G”
Sets for third calibration from EPROM at wavelength of 700nm,
manual range = 7, and go.
OUTPUT 704 ; “K”
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