Setup And Calibration - Cardinal 748 Technical/Operation Manual

Single byte KeyCommands (0, 1, 2, 3, 4, 8 and 9) are NOT XORed, instead the transmitted CKsum
is a two (2) byte ASCII representation of the HEX value of the command. For example:
GROSS command (0): STX030ETX
"0" = (30h)
Cksum = 30
String to send, 02h 30h 33h 30h 03h
PRINT command (4): STX434ETX
"4" = 4 (34h)
CKsum = 34
String to send, 02h 34h 33h 34h 03h
Your 748 indicator has been thoroughly tested and calibrated before being shipped to you. If you
received the indicator attached to a scale, calibration is not necessary. If the 748 is being connected
to a scale for the first time or recalibration is necessary for other reasons, proceed as indicated.
The calibration toggle switch is located on the main printed circuit board. If you have a NEMA 4X
enclosure you may gain access to this switch simply by opening the door on the enclosure. The
calibration switch is identified in figure no. 11.
Calibration
Switch
figure no. 12 - calibration
switch location
CAUTION: The membrane keyboard is not to be operated with pointed objects (pencils,
pens, fingernails, etc). Damage to keyboard resulting from this practice will NOT be
covered under warranty.
Press . Set the calibration switch on the printed circuit board to the CAL position then press
OFF
and release. Pressing the
CALIBRATION

SETUP AND CALIBRATION

0 = no 1
key will advance to the Prt= prompt.
PRINT
13
If you have a 748 desktop enclosure, it will
be necessary to remove one of the end caps
from the enclosure to gain access to the
calibration switch. To do this, first remove the
instrument from the gimbal mounting by
removing the two (2) large knobs. Make
certain that the smaller locking screw on one
side is first loosened. Next, remove the top
and bottom screws from the right end cap
(see figure no. 12). The switch is located on
the printed circuit board near the center.
Once you have located the calibration switch
proceed with the calibration instructions. A
summary of the calibration process is shown
in graphical form at the end of this section.
= yes
ON
ZERO