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2.5 Connecting RS485 Connector
When setting the parameters of 3718-A/3719-A, connect an RS485 connector and PC
with the optional extra, USB-RS485 converter (con connecting cable).
Activate the provided settings software to set the parameters of this instrument.
Both 3718-A and 3719-A are connectable to the Clean Room Monitoring System
（
CRMS
）
using an RS485 connector.
2.6 Connecting the Zero Filter
To confirm the cleanness of the optical system, conduct a zero check before each
measurement.
Connect the tube side of the zero filter to the Adapter 1 of this instrument.
The filters must be handled with care.
If air leakage occurs between the filter and this instrument, zero checks cannot be
conducted properly.
Pin Number
RS485 Connector Signal Name
1
RS485
TXD +
2
RS485 TXD -
3
RS485 RXD +
4
RS485 RXD -
5, 6
DC power supply (-) terminal (P-GND)
7, 8
DC power supply (+) terminal (DC 9-28V)
*Not in use when the power is supplied
through the AC adapter or the analog output
terminal.
RS485 Connector
Zero Filter
1
2
3
4
5
6
7
8
STATUS
PARTICLE
MODEL 3719-A
LASER PARTICLE SENSOR