NEC PD Comms Tool Guía de usuario Pagina 51

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The RS232 connection from the host PC must connect to the RS232 IN on the rst display.
Communications via both LAN and RS232 are not supported at the same time. The type of communications link
to use to the display must be selected by OSD setting EXTERNAL CONTROL RS-232C / LAN.
LAN Daisy-chain
Supported display connection congurations
LAN1 LAN2
RS-232C
RS-232C IN, LAN 1 and LAN2
Models that have two RJ45 LAN connections (not including any RJ45 LAN connections on OPS devices) support LAN
daisy-chaining. The RJ45 LAN connection labeled LAN1 should be used as an input to the display from the network or
host PC. The other LAN connection labeled LAN2 is the output to connect to the LAN1 on the next display in the daisy
chain.
The display functions as a two port LAN hub for LAN trafc.
Important: The LAN hub function only works when AC power is applied to the display and the LAN interface is powered
on. By default the LAN POWER setting is set to turn o when the display enters a standby power mode. This will prevent
communications with other devices along the LAN daisy-chain. To prevent this, change the LAN POWER setting ON - either
via the OSD, or via the “LAN Power” OpCode.
The rst display in a LAN daisy-chain communicates with the host PC using either an RS232 direct connection, or by
connecting LAN1 to the network. Selection between the LAN1 and RS232 ports is done automatically by the display.
Displays in a LAN daisy-chain that are connected to a LAN network can be addressed in two different ways:
1. Directly:
Each display in a LAN daisy-chain can also be communicated with directly by addressing the display by it’s IP
address and Monitor ID.
See “Example: Multi IP LAN using LAN daisy-chain” on page 57.
2. Via Translation:
The rst display in a LAN daisy-chain can act as a host for commands it receives for any of the other displays further
along the daisy-chain. It will translate and forward to the relevant display any commands received via the LAN2
connection sent to it’s IP address, but with Monitor IDs for other displays in the daisy-chain.
In order to do this, the Auto ID function must be successfully performed on the rst display. The Auto ID function is
used to identify all displays along the LAN daisy-chain and assign them sequential Monitor IDs. The rst display in
the LAN daisy-chain stores a table of the IP addresses and assigned Monitor IDs for all of the other displays in the
daisy-chain.
51 | NEC PD COMMS TOOL - USER’S GUIDE
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