32
INSTRUCTIONS FOR USE OMX 100
7. DATA PROTOCOL
The instruments communicate via serial line RS232 or RS485. For communication they use the ASCII protocol.
Communication runs in the following format:
ASCII:
8 bit, no parity, one stop bit
The transfer rate is adjustable in the instrument menu and depends on the control processor used. The instrument
address is set in the instrument menu in the range of 0 ÷ 31. The manufacture setting always presets the ASCII protocol,
rate of 9600 Baud, address 00. The type of line used - RS232 / RS485 - is determined by an exchangeable card
automatically identified by the instrument.
COMMANDS FOR INSTRUMENT OPERATION
The commands are described in specification you can find at
www.orbit.merret.cz/rs
.
A command consists of a number and a letter, where the letter size is of significance.
DETAILED DESCRIPTION OF COMMUNICATION VIA SERIAL LINE
Activity
Type
Protocol
Data transferred
Data solicitation (PC)
232
ASCII
#
A
A
<CR>
485
ASCII
#
A
A
<CR>
Data transfer
(Instrument)
232
ASCII
>
R
SP
D
D
D
D
D
(D)
(D)
<CR>
485
ASCII
>
R
SP
D
D
D
D
D
(D)
(D)
<CR>
Command tranfer
(Instrument) - identi-
fication
232
ASCII
#
A
A
1
Y
<CR>
485
ASCII
#
A
A
1
Y
<CR>
Command confirma-
tion (Instrument)
232
ASCII
ok
!
A
A
<CR>
bad
?
A
A
<CR>
485
ASCII
ok
!
A
A
<CR>
bad
?
A
A
<CR>
Legend
#
A
A
N
P
<CR>
<SP>
D
R
!
?
>
Beginning of the command
Two signs of the inst. address (sent in ASCII - decades and units, ex."01")
Carriage return
Space
Number and command - command code
Data - usually signs "0"..."9","-","." ; (D) - dp. and (-) may prolong data
Relay status; zero bit corresponds with 1st relay, 1st bit with 2nd relay, etc.
Positive command confirmation (ok)
Negative command confirmation (bad)
Beginning of the transmitted data
35
23
H
13
0D
H
32
20
H
30
H
...3F
H
33
21
H
63
3F
H
62
3E
H
0...31
Summary of Contents for OMX 100 Series
Page 19: ...19 4 INSTRUMENT SETTING CONFIGURATION MODE ...
Page 23: ...23 4 INSTRUMENT SETTING CONFIGURATION MODE ...
Page 27: ...27 4 INSTRUMENT SETTING CONFIGURATION MODE ...
Page 34: ...34 INSTRUCTIONS FOR USE OMX 100 ...
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