4
SERIES 2000 COMMUNICATIONS MANUAL
M41 Issue 1.1
2.4
Connection reference table
Instrument
Terminal
Function
EIA-485
EIA-422-A
13
TX-
TX-/RX-
TX-
14
TX+
TX+/RX+
TX+
15
RX+
TX+/RX+
RX+
16
RX-
TX-/RX-
RX-
1
EARTH
N/C or
SCREEN
N/C or
SCREEN
2.5
Software Configuration.
Software configuration of the instrument may be performed once the instrument has been
placed in 'E mode'. This is done by removing the instrument from its sleeve and setting the
'E mode' switch to ON. The instrument is then replaced in its sleeve and power re-applied.
Use the scroll button (>) to scroll through elements until the
ConS
group is reached. Press
the star button to access the group.
Scroll to the element
bAUd
and select the baud rate required from 1200, 2400, 4800 or
9600 using the up/down keys
Scroll to the element
AddrS
. This is the controller instrument address and may be set
between 0 and 99 using the up/down keys. If the instrument is a P2000 programmer then
the controller part of the instrument will have an address as set by this parameter and the
programmer part of the instrument will have an address which is the controller address plus
16.
3.0
COMMUNICATIONS PROTOCOL
3.1
Message construction
Messages to and from the instrument vary in form depending on, amongst other things, the
type of message and its contents. There are three basic message types:-
3.1.1
Write messages
Write messages to the instrument take the following form.
WAAPSSD..D<CR>
where
W
= write message header
AA
= instrument address
P
= parameter code
SS
= segment number field (P2000 Only)
D..D
= numeric data field
