The global address can be used to change RS-485 address for a particular
device with unknown address:
1. Make sure only one device (which address must be changed) is connected to
the RS-485 network.
2. Type the memory write command with global address: !00,MW,7,XX[CR] where
XX, the new hexadecimal address, can be [01 – FF].
After assigning the new address, a device will accept commands with the new
address.
Address 00 is reserved for global addressing. Do not assign,
the global address for any device. When command with global
address is sent, all devices on the RS-485 bus execute the command but do not
reply with an acknowledge message.
NOTICE
Do not assign the same RS-485 address for two or more
devices on the same RS-485 bus. If two or more devices with
the same address are connected to the one RS-485 network, a communication
collision will take place on the bus and communication errors will occur.
NOTICE
Command
Name
Flow
Diagnostic
Roll Back
N2 Feature
Gas Select
Auto Zero
Flow Alarms
Description
Requests the current flow sensor
reading in current EU.
Enable / Disable LCD
Diagnostic messages (only
for LCD option).
Request current status of the
Diagnostic events, LED status and
LCD diagnostic mode
(enabled/disabled).
Enable / Disable Roll back
to N2 feature.
Selects one of the ten primary gas
calibration tables to use. Tables
are entered via the MEM
commands at time of calibration.
Starts /reads the status of the auto
zero feature (Note: The Z,N
command can be used only when
absolutely no flow thru the meter
and no earlier then 6 minutes after
power up. It can take several
minutes to complete. Unit will not
respond to other commands when
this is in progress).
Sets / reads the status of the gas
flow alarms.
Note: High and Low limits have to
be entered in the % FS. High
alarm value has to be more than
Low
alarm value.
Alarm conditions:
Flow > High Limit = H
Flow < Low Limit = L
Low < Flow < High = N
No.
1
2
3
4
5
6
Command
F
D
N
G
Z
A
Argument 1
E (enable LCD
Diagnostic
Messages)
D (disable LCD
Diagnostic
Messages)
NO ARGUMENT
(read current status
of the diagnostic
word)
E
(enable Roll back to
N2)
D
(enable Roll back to
N2)
NO ARGUMENT
(read current mode
of the N2 Roll back )
0 (gas 0) to
9 (gas 9)
NO ARGUMENT
(read status)
N (do it now)
W (Write Zero to
EEPROM)
S (Status while auto
zero in progress)
V (Display zero
value)
H (high flow limit)
L (low flow limit)
A (action delay in
seconds)
E (enable alarm)
D (disable alarm)
R (read current
status)
S (read current
status)
B Block (Latch)
mode
Argument 2
<Value> (0 to
100%FS)
<Value> (0 to
100%FS)
<Value> (0 to
3600 sec)
<Value>
(0-disabled)
(1-enabl’d L)
(2-enabl’d H)
(3-both L,H)
Argument 3
Argument 4
Response
<Value> (Actual flow in
current engineering
units)
D:E
D:D
D:0x0,L:9,E
0x0 – diagnostic word
9 - current LED status
E - LCD mode (enabled)
N:E
N:D
N:D or
N:E
G0 through G9,
<Gas Name>
G0 through G9,
<Gas Name>
ZN
ZW (when done)
ZNI,<value> while Z, N
is in progress
ZV, <zero value>
AH <Value>
AL <Value>
AA: <Value>
AE
AD
N - (no alarm)
H - (high alarm)
L - (low alarm)
AS:M,L,H,D,B where:
M – mode (E/D)
L – Low settings (%FS)
H – High settings (%FS)
D – Action Delay (sec)
B – Latch mode (0-3)
AB:<Value> where:
Value = 0 - 3
8.3 ASCII Commands Set
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