Contrex MLP-Trim Manuel d'utilisateur télécharger pdf (Page 126)

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Data Inquiry

Use the Data Inquiry to request the current value for Parameters (i.e., Control

Parameters or Monitor Parameters).

Table 3-55 Data Inquiry - Host Transmission

Character # 1 2 3 4 5 6 7 8 9 10 11 12

DEV # DEV # MSG PAR # PAR # DATA DATA DATA DATA DATA

DESC STX 10s 1s TYPE 10s 1s 1000s 100s 10s 1s FORM ETX

ASCII STX 0-9 0-9 2 0-9 0-9 0 0 0 0 0 ETX

The following is a description of the Data Inquiry - Host Transmission Characters.

Character 1 - STX:

This is the first character in the character string. None of the other characters will

be recognized without this character prefix. Always use the ASCII “STX” character;

it enables the MLP–Trims receive buffer.

Characters 2, 3 - Device #:

These characters are the access address of the MLP–Trim. This number identifies

individual MLP–Trims on a mutltidrop system. The MLP–Trim will accept data only

if this number matches the MLP–Trim's address (CP-70), with the exception of a

“00” address. The “00” address is universally accepted by all MLP–Trims that are

on the RS485 Serial Communications Interface.

Character 4 - Message Type:

This character should always be “2”.

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Contrex MLP-Trim Manuel d'utilisateur Page 126