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5.1 Serial Communication Interface Programming
Pressure Set Point:
In order to write a pressure set point to the TIM-100/120, the following command must be
issued:
Host to TIM-100/120 Command Message: >01S0100xxxyy↵
Where: xxx = 000 to FFF representing a 0 to full scale range
yy = two hex character check sum
Function: This message sends a set point to a SENTRY TIM-100/120 configured for
pressure control (i.e. SENTRY 1000 or SENTRY 1510).
Example: For a SENTRY 1000 with a 2” H
2
O (50.8 mm H
2
O) full-scale range,
>01S010099A28↵ changes the set point to 1.2” H
2
O (Hex 99A based on 2”
H
2
O = Hex FFF).
Note:
• The SENTRY TIM-100/120 addressed is at base address 0, memory bank 1
(>01S0100xxxyy↵).
• Memory location “0100” (Pres Sp1) is being modified (>01S0100xxxyy↵).
• If additional TIM-100/120s were connected on the same network, each base address
would be incremented by four.
Example: >05S0100xxxyy↵
Flow Set Point
In order to write a flow set point to the TIM-100/120, the following command must be issued:
Host to TIM-100/120 Command Message: >01S1000xxxyy↵
Where: xxx = 000 to FFF representing a 0 to full scale range
yy = two hex character check sum
Function: This message sends a set point to a SENTRY TIM-100/120 configured for
flow control (i.e. SENTRY 9000).
Example: For a SENTRY 9000 with a 35 CFM (990 LPM) full-scale range,
>01S100099A28↵ changes the set point to 21 CFM (590 LPM) (Hex 99A
based on 35 CFM = Hex FFF).
Note:
• The SENTRY TIM-100/120 addressed is at base address 0, memory bank 1
(>01S1000xxxyy↵).
• Memory location “1000” (Flow Sp1) is being modified (>01S1000xxxyy↵).
• If additional TIM-100/120s were connected on the same network, each base address
would be incremented by four.
Example: >05S1000xxxyy↵
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