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24
of
38
NN is the two-character checksum value that is automatically
calculated and output by the control unit
Changing the Communication Standard
The Terranova® 752A serial communication standard may be changed via an internal DIP
Switch, DIP Switch S3, located towards the front panel of the control unit. Three different
standards
–
RS-232, RS-422, and RS-485
–
may be selected via the use of two individual
switches on DIP Switch S3. Although DIP Switch S3 has eight individual ON/OFF switches labeled
S3-1 to S3-8, only DIP Switch S3-1 and DIP Switch S3-2 are utilized.
To change the Terranova®
752A communication standard
:
1.
Turn the unit OFF via the
POWER
switch
2.
Remove the power cord and ion pump cable
3.
Remove the six screws along the edge of the top cover
4.
Carefully lift the top cover and disconnect the fan plug
5.
Remove top cover
6.
Locate DIP Switch S3
–
see
Figure 3
7.
Set individual switches to desired standard according to
Table 12
8.
Connect the fan plug and replace top cover
9.
Connect the ion pump cable and power cord
10.
Restart the unit via the
POWER
switch
Standard
DIP Switch S3-1
DIP Switch S3-2
RS-232
ON
ON
RS-422
OFF
ON
RS-485
OFF
OFF
Table 12.
Serial communication standard DIP Switch S3 position
Once the Terranova® 752A is powered ON, the unit will commence the S
elf-Test.
Thereafter,
the control unit may resume normal operation.
Examples
Serial communication: RS-232/422
Checksum value: Disabled
CHANNEL 1 PUMP SIZE value: 20 L/s
*PS1:20.0<cr>
Output:
OK:20.0,NN
Serial communication: RS-485
Hexadecimal address: 05
Checksum value: 00
CHANNEL 2 PUMP SIZE value: 20 L/s
*05PS2:20.0,00<cr>
Output:
05,OK:20.0,NN
