Adjustment Of Display Contrast; Communication Time-Out Selection - Honeywell Enraf 977 Instruction Manual

Note 2:
When a pincode is not required, item OB must be programmed with the first eight character being spaces ( )
and the next eight characters being dots (.).
Item Name
W2= Protection level 2
0B= Pincode TSI
EX Exit

3.3 Adjustment of display contrast

If required, the contrast of the display can be adjusted. When the
cover of the Tank Side Indicator is removed, a potentiometer can
be reached through a hole in the chassis plate, on the left hand
side of the display
(refer to fig. 3.2).
Turning the potentiometer clockwise will increase the display
contrast, while turning the potentiometer
counter-clockwise decreases the display contrast.

3.4 Communication time-out selection

As a default, the communication time-out is set to
5 seconds. If there appear to be minor communication errors
on the 977 TSI communication line, the communication time-
out can be increased to 15 seconds.
To select the 15 seconds time-out a solder strap must be
made on the main printed circuit board of the TSI. Refer to
figure 3.3.
With later versions of the TSI, a strap can be placed.
Refer to figure 3.4.
Page 8 Instruction manual 977 Tank Side Indicator
Description
Enter protection level 2
Sixteen characters. Only the first 8 characters are used as TSI
Pincode; the remaining characters must be filled with dots (.).
For example:
Pincode is LDU; enter the characters L, D and U plus 5 times
space to complete the 8 characters pincode, and fill up the
remaining 8 characters with dots (.). Hebce, enter:
L D U space space space space space . . . . . . . .
When there is no pincode required, enter:
space space space space space space space space . . . . . . . .
Exit protection level 2
Figure 3.3 Strap for communication time-out
Commissioning
Figure 3.2 Position of potmeter
for display contrast