12286 Rev 2
Page 3of 3
4.1
Operation
SENTRY 1000, SENTRY 1510
SENTRY 9000
Process exhaust pressure set point:
The set
point voltage transmitted from the tool to the
SENTRY TIM-100/120 will be converted to a
pressure set point using the following equation:
Pres Sp
Aux In
Aux FS
PresFS
=
×
Process exhaust pressure read-back:
The
read-back voltage returned by the SENTRY TIM-
100/120 to the equipment is proportional to the
actual measured pressure determined by the
following equation:
Measured Process Exhaust Pressure =
Pres
Pres FS
Aux FS
×
Process exhaust flow set point:
The set
point voltage transmitted from the tool to the
SENTRY TIM-100/120 will be converted to a
flow set point using the following equation:
FlowSp
Aux In
Aux FS
FlowFS
=
×
Process exhaust flow read-back:
The
read-back voltage returned by the SENTRY
TIM-100/120 to the tool is proportional to the
actual measured flow determined by the
following equation:
Measured Process Exhaust Flow =
Flow
Flow FS
Aux FS
×
Serial Interfaced Operation
When the SENTRY system is configured for serial communication operation, the process
exhaust pressure or flow set points are entered through the process equipment. The serial
interface operates on standard RS422/485 serial communication protocol. Process Equipment or
host programming of interrogation commands is required in order to operate in serial
communication mode. For complete interface instructions, refer to section 5.
Note:
•
The menu item “STPTMODE” must be set to “SINGLE” in order to use serial communication.
Refer to Section 2, page 3 for details.
•
The menu items “BAUD RATE” and “PARITY” must reflect the process tool baud rate and parity in
order to use serial communication.
