50
Model 4688-IR / 4679-IR
Operation & Maintenance Manual
Manual #087-0007G, 10/2003
The COMM Menu
Accesses the transmitter's loop current, report generator, and serial communication
parameters.
Displayed
As:
Description
Min
Max
Default
Value
MEM
Region
MODBUS
Register
Address
Data
Type
[BITS]
Assigned
Parameter
#
MA.04
4.00 mA Loop Cal Point
- This
value can be adjusted to drive
precisely 4.00mA to calibrate the
0% concentration level, which can
help overcome excessive
wire/receiver loading. The value
presented is the hexadecimal value
that is written to the digital-to-analog
converter (DAC).
NOTE: There is a 5 second delay
between the time the parameter is
set and the time the output is seen
by the receiving device.
LMEM
MA.20
20.0 mA Loop Cal Point
- This
value can be adjusted to drive
precisely 20.0 mA at the full scale
concentration level, which can help
overcome excessive wire/receiver
loading. The value presented is the
hexadecimal value that is written to
the digital-to-analog converter.
LMEM
MA.F
4-20 mA Fault Level
- Specifies the
output in milliamps when the
transmitter detects a fault condition.
2.4 mA
4.0 mA
3.2 mA
PMEM
40345
REAL
[32]
45
MA.I
4-20 mA Inhibit Level
- Specifies
the output in milliamps when the
transmitter is placed into an alarm
inhibit condition.
1.5 mA
20.0 mA
1.5 mA
PMEM
40343
REAL
[32]
46
MA.t
4-20 mA Test Level
- Specifies the
output in milliamps which is forced
onto the current loop for test
purposes (checking alarms at the
receiver, etc.).
1.0 mA
20.0 mA
4.0 mA
PMEM
40341
REAL
[32]
47
RP.ON
Report On/Off
- When set to 1, a
report line is transmitted on the
serial communication interface
which may be sent to a printer, or to
a host computer for data capture.
Since the reports are not
synchronized by a master, the
communication must occur on
dedicated serial port (cannot be
shared by more than one
transmitter). The report rate is
determined by the RP.Pd parameter
and the format of the report line is
controlled by the RP.F1 through
RP.F8 parameters. Field delimiters
and line termination strings are
specified by the RP.d1 through
RP.d5 and RP.E1 through RP.F5
parameters.
0
1
0 (Off)
PMEM
40310
Unsigned
Byte
[8]
48
The loop
adjustment
parameters are
typically not used in
serial
communications. In
applications using 4-
20 loop these
adjustments are
adjusted at the
transmitter while
observing the
receiver's zero or
full scale readings.
COMM MENU - Report Generator Parameters
COMM MENU - Loop Current Parameters
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