Instruction Manual #122162 43
6.4 Analog Interfaced Operation
When the SENTRY system is configured for analog operation, the process exhaust pressure set
points are entered through the process tool. The analog interface operates on a standard 0 to 5
volt full scale (equivalent to 0 to 25.40 mm H
2
O or 0 to 50.80 mm H
2
O) command signal.
• The menu item “STPTMODE” must be set to “ANALOG” in order to use
analog communication. Refer to section 5.8.2 for details.
• The menu item “AUX IN” will reflect the voltage received at the TIM 100/120.
There is an implied decimal point to the left of the third digit (5000 = 5.000
volts).
• The voltage indicated by the “AUX IN” should be within .02 volts of the
analog voltage signal transmitted by the process tool.
6.5 Serial Interfaced Operation
When the SENTRY system is configured for serial communication operation, the process
exhaust pressure set points are entered through the process tool. The analog interface
operates on standard RS422/485 serial communication protocol. OEM tool or host programming
of interrogation commands is required in order to operate in serial communication mode. For
complete interface instructions, refer to the “Serial Communication Programmer’s Guide for the
SENTRY TIM 100/120”.
• The menu item “STPTMODE” must be set to “SINGLE” in order to use serial
communication. Refer to section 5.8.2.
• The menu items “BAUD RATE” and “PARITY” must reflect the process tool
baud rate and parity in order to use serial communication.
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