FGH 2000 Series - Instrument Address and Wildcards; Parameter and Data Fields; Controller Read;Write Parameter Codes

6 SERIES 2000 COMMUNICATIONS MANUAL
M41 Issue 1.1
3.3 Instrument address.
Each instrument must be given a unique address between 0 and 99. This is set when the
instrument is in E mode. The address field of the message, consisting of two ASCII
characters determines to which instrument the message is directed. The instrument ignores
the message unless it corresponds to its own address.
For serial communications purposes, the programmer and controller parts of the
instrument are treated as separate instruments. The controller part will recognise
messages whose address field corresponds exactly with the address programmed in
engineers mode. The programmer part will recognise the programmed address plus 16.
This fact should be borne in mind when assigning controller addresses on the network.
3.3.1 Wildcard addresses
If desired, a group of instruments can be written to together by using a wildcard character
(large X) in place of one or both of the address characters. eg.
W6XC0100<CR>
would result in all instruments on that communication line with addresses of 60 to 69 having
their local set point set to 100.
Instruments written to with wildcard addresses do not reply.
3.4 Message parameter code.
The parameter code field of the message is a single ASCII character. In a write message
this corresponds to one of the control parameters listed in paragraph 4.6, 'parameter codes'.
In the case of set messages, this is still a single ASCII character, but corresponds to one of
the 'set status codes' listed in paragraph 3.7.
3.5 Segment number field (P2000 Only).
This field is used to specify the segment number reference required for some messages to
the profile generator. The segment number should be a two digit field, left padded with a
zero if required.
3.6 Message data field
The message data field consists of between four and eight ASCII characters and carries the
data associated with the specified parameter. There are six types of data field, the type
depending on the particular parameter being accessed. The parameter code tables in
section 3.7 and 3.8 specify the data field format for each parameter.
3.7 Controller read/write parameter codes
Each parameter within the controller is assigned a single alpha code. The meaning of this
code may vary according to the controller action type, eg. heat/cool, motorised valve etc.