12286 Rev 2
Page 2 of 5
5.1
Serial Communication Interface Programming
Start of
message
Address of controller to
receive the message
Command
Command qualifiers [position] and [data]
Check sum
>
End of message
↵
Beginning
M iddle
End
Power-Up Clear Using Command “
A
”
Once power has been applied to the TIM-100/120, a power-up clear command is required to
initialize communications between the host and the TIM-100/120. This command only
functions if it is the first command sent after power-up and prevents the TIM-100/120 from
returning a “power-up clear expected” error.
Note:
•
This command has
no
effect on the TIM-100/120 operation.
•
After a power up clear command is issued, the TIM-100/120 resets to the last
saved menu parameter settings.
Host to TIM-100/120 Command Message:
>00AA1
↵
Function:
This message sends a power-up clear command to the TIM-100/120 at base
address 00 (>
00
AA1
↵)
.
Note:
•
If additional TIM-100/120s were connected on the same network, each base address
would be incremented by four. Example: >
04
AA1
↵
, >
08
AA1
↵
, >
0C
AA1
↵
, etc.
TIM-100/120 to Host Response:
>A
↵
Function:
This response indicates an acknowledgement without error.
Set Point Using Command “S”
A set point command must be sent to the TIM-100/120 in order to command the process
exhaust controller to a new set point. Depending on whether the exhaust controller is a
pressure or flow controller, one of two memory locations must be addressed for this command.
A mask is used to define the memory location.
Note:
•
A set point or read-back can be resolved to a 12-bit value (0 to 2
12
- 1) with hexadecimal
representation of 000 to FFF (0 to 4095 decimal). The value is scaled relative to full-
scale pressure or full-scale flow.
