CONTREX M-Traverse - Manual (Page 122)

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Data Inquiry
Use the Data Inquiry to request the current value for Parameters (i.e., Control
Parameters or Monitor Variables).
Table 3-42 Data Inquiry - Host Transmission
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Dev# Dev# MSG Par# Par# Data Data Data Data Data Data Data Data Data
STX 10s 1s Type 10s 1s 10mil 1mil 100th 10th 1th 100s 10s 1s Forma t ETX
STX 0-9 0-9 2 0-9 0-9 0 0 0 0 0 0 0 0 0 ETX
Character
#
DESC
ASCII
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
to enable the M–Traverse's receive buffer.
Characters 2, 3 - Device Number:
These characters are the access address of the M–Traverse. This number
identifies individual M–Traverses on a multidrop system. The M–Traverse will
accept data only if this number matches the M–Traverse's address (CP-70), with
the exception of a “00” address. The “00” address is universally accepted by all
M–Traverses that are on the RS422 Serial Communications Interface.
Character 4 - Message Type:
This character should always be “2”.