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23
of
38
Command Characters
The following input format is used by the Terranova® 752A to modify unit parameters or
operate unit functions
*
[Hexadecimal Address][Command Character]
:
[Parameter Value][
,
(Checksum Value)]
<cr>
where the asterisk symbol (
*
) indicates the start of transmission, the colon symbol (
:
) tags the
transmission as a command string, and the return character (
<cr>
) ends input/output
transmission. The command character is a two-letter character used to select the unit
parameter or function to modify or operate, respectively. A parameter value must follow the
command character after the colon symbol
–
see
Table 11
for a list of command characters and
corresponding parameter values. Command characters are not case-sensitive.
The hexadecimal address is a two-digit hexadecimal value from 00 to FF (or 0 to 255 in decimal
notation) used to differentiate between multiple devices. The hexadecimal address is only
necessary when the unit is configured for RS-485 serial communication
–
see
Changing the
RS-485 Address
.
The checksum value is a two-character value used to conduct checksums with external devices
when DIP Switch S3-5 is ON. The comma mark (
,
) must be included in the command string if
sending a checksum value. Although a checksum value is not necessary in a command string,
the Terranova® 752A will always output a checksum value regardless of DIP Switch S3-5
position. The checksum function may be disabled by either setting DIP Switch S3-5 to OFF or
sending a
00
checksum value when DIP Switch S3-5 is ON
–
see
Figure 3
for DIP Switch S3
location.
Command strings to modify unit parameters may be sent while HV operation is OFF or disabled
due to an open safety interlock circuit. Any saved changes will appear once the Terranova®
752A resumes normal operation. User may also manually modify unit parameters while
concurrently communicating with the Terranova® 752A.
Character
Command
Parameter Format
CHANNEL 1
CHANNEL 2
UN1
UN2
PRESSURE UNIT Value
TORR, MBAR, PASCAL
PS1
PS2
PUMP SIZE Value
XXX.X [L/s]
HV1
HV2
High Voltage Operation
ON, OFF
SP1
SP2
SET POINT Value
X.X e-X
(0.0: Off)
MV1
MV2
MAX VOLTAGE Value
XX00 [V]
(500 V steps from 3500)
MC1
MC2
MAX CURRENT Value
XX [mA]
(1-25)
Table 11
. Serial communication command characters
