User Manual
E110-P
Page 30
FW_E110-P_M_v0301-01_EN
6
PULSE OUTPUT
6.1 MODE
The following modes of operation are available for the digital outputs:
●
Disabled
: the output is switched off.
●
Scaled
: each time the accumulated total has increased with the Amount
set at
6.3: PULSE OUTPUT > AMOUNT
, a pulse will be sent on the output with
the Width set at
6.2: PULSE OUTPUT > WIDTH
.
●
Retransmit
: the unscaled incoming pulse from the flowmeter is
retransmitted on the output.
The
Retransmit
mode is often used when sinus / non-square wave input
signals are present (for example, coil signals) that need to be transmitted as
robust square wave forms. The max. frequency is 10kHz with 50% duty
cycle and a minimum on and off time of 50µs.
When
Retransmit
is selected, the menus
6.2: PULSE OUTPUT > WIDTH
and
6.3: PULSE OUTPUT > AMOUNT
will disappear.
6.2 WIDTH
When scaled pulse output is selected, the pulse width determines the time
that the output will be active, that is, the duration of the pulse. The pulse
width is set in milliseconds in the range 0.001 – 9.999 sec.
The value “zero” will disable the pulse output.
The scaled pulse signal always has a 50% duty cycle. This means the
minimum time between pulses is equal to the pulse width setting. If the
frequency goes out of range (for example when the flowrate increases), an
internal buffer stores the missed pulses. As soon as the flowrate slows
down, the buffer is emptied.
Pulses can be missed due to a buffer-overflow, therefore it is advisable to
program this setting within its range.
6.3 AMOUNT
One pulse is generated for every X-quantity measured. For example, if 100
pulses per gallon are required, enter 0.01 GAL.
0.01 GAL x 100 pulses = 1 gallon
After pressing PROG, the decimal point will start to flash. The decimal
position can then be changed by pressing the SELECT-key, then press the
CLEAR key to set the digits.
5.5.7
MENU 7: MODBUS COMMUNICATION
The E110-P can optionally be equipped with a communication interface that uses the Modbus
protocol (Type CB/CH/CU). See
Section C: Modbus communication [»62]
for a detailed explanation
of the protocol, data types, and available registers.
7
MODBUS COMMUNICATION
7.1 SPEED
Sets the baud rate. This setting should match the speed used on the
communications bus. The following communication speeds can be
selected:
1200, 2400, 4800, 9600, 9600HP, 19200, 38400
Communication speeds from 9600HP and upwards are more power
consuming. When used with battery power, it is advised to set the speed at
9600 or lower.
7.2 ADDRESS
Configures the bus address of your device on the communication bus.
7.3 MODE
Configures the Modbus communication mode of your device on the
communication bus.
7.4 DATABITS
Configures the number of data bits. This setting should match the number
used on the communications bus.
Select 8 bit for Modbus RTU and 7 or 8 bits for Modbus ASCII.
7.5 PARITY
Configures the parity mode. This setting should match the parity mode used
on the communications bus.
