MRLDS-400 Series Application
Operation • 23
Stop Bits
Sets instrument stop bits for connection to RS-485 Modbus interface (Default: 1 stop
bits). To set number of stop bits:
• On the
Configure
tab select
Modus
then select
Stop Bits
. Select
1
or
2
and
OK
to
confirm.
Parity
Sets instrument parity for connection to RS-485 Modbus interface (Default:
None
).
To set parity:
• On the
Configure
tab select
Modus
then select
Parity
. Select
None/Odd/Even
and
OK
to confirm.
IMPORTANT: Stop bits must be set to 1 where parity is Odd or Even.
Enable 120
Ω
Termination
For optimal communication reliability, in RS-485 Modbus networks the last
instrument physically connected to the RS-485 bus must include a 120Ω
termination
resistor. This is to reduce the potential for electrical signal reflection on long buses
due to impedance mismatches. Typically, this requires a physical resistor with the
same characteristic impedance of the bus cable to be installed on the bus.
MRLDS-450 instruments include this termination resistor on all instruments and
allow this termination to be enabled via this configuration setting without the need
for an external physical resistor. To enable this termination resistor:
• On the
Configure
tab select
Modbus
then select
Enable 120Ω Termination
.
Select
Enable/Disable
and select
OK
to confirm.
IMPORTANT: Termination resistor should only be enabled on last instrument physically
connected to RS-485 bus. An external resistor should not be connected where this is enabled
on the instrument.
4.2.3.7. Output Configuration
Analog Output Range
Sets instrument analog output range. Available ranges: 1-5V (Default), 0-5V,
0-10V, 2-10V, 4-20mA. To set range:
• On the
Configure
tab select
Outputs
, then select
Analog Output Range
. Select
desired range and select
OK
to confirm.
