Yokogawa DR240 - Manual (Page 63)

3-18 IM DR232-01E
3.5 Connecting the Interface Cables
For details on connectin the RS-422-A/RS-485 connector of the RS-422-A/RS-485
communication interface module to a personal computer, see IM DR231-11E, “DR231/DR232/
DR241/DR242 Communication Interface User’s Manual.”
CAUTION
When (dis) connecting the RS-422-A/RS-485 cable, turn OFF the power
of both the personal computer and the instrument. If the power is not
turned OFF, malfunctions may occur and the internal circuitry may be
damaged.
Ethernet
Tx (yellow)
)
LINK (yellow)
STS1 (green)
STS2 (green)
Status
Indicator LED
Dip Switch
1 2 3 4
ON
OFF
10BASE-T Port
Connect the RJ-45 modular jack
of the twist pair cable connected
to the 10BASE-T network.
You can select the following three modes by setting the dip switch.
Configuration mode:
A mode in which the IP address, subnet mask, and default gateway are set
for the DR.
Test mode: A mode in which the condition of the physical connection is tested.
Communication mode: A mode in which the DR is connected to the network to carry out
communication. Use this mode to read in the DR measurement data with
the PC.
In addition, you can turn ON/OFF the Keepalive function.
Mode Setting
Mode Switch 1 Switch 2
Configuration mode ON OFF
Test mode OFF ON
Communication mode OFF OFF ←Default Setting
Do not set both dip switches, 1 and 2, to ON.
Keepalive Setting
Keepalive Switch 3
Enable ON
Disable OFF ←Default Setting
Keepalive is a function supported by TCP. It sends packets at constant time intervals and
automatically disconnects when there is no corresponding response. This instrument sends
packets at 30-second time intervals. If a response is not received, it sends 4 more packets at one-
second intervals. If a response is still not received, the connection is dropped.
Have dip switch 4 turned OFF.