ASCO 5010 Remote Display Unit
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5.4
Recommended Mode of LAN Connection for ASCO 5400 Series
It is suggested that the ASCO 5010 RDU be connected to the port marked LAN2/LCD on the ASCO 5450/5490 Power Quality
Meter and that the LAN1 port on the 5410 be used to connect to the LAN for communicating PQZip files to the Node on the
power quality server.
Figure 7: Power Over Ethernet PoE Connection
5.5
USB Connection
Follow accepted USB protocol connection procedures.
5.6
RS485/422
The RS485/422 serial communications hardware protocol is an industrial standard using 2 or 4 wires for communication. The
wires are to be connected to the terminals marked RS485/422 on the ASCO 5010 RDU as shown in
Figure 8
and to the marked
terminals on the CPU module of the ASCO 5400 Series Power Quality Meter.
Figure 8: Terminals for RS485/422 on the Rear Side of the ASCO 5010 RDU
To enable understanding of the protocol for the purpose of enabling efficient communication, basic elements of the protocol are
described here:
√
Voltage is typically 5V DC
√
Cable is comprised of 2 shielded twisted pairs
√
Typical length of cable is < 1000 meter with no repeater
√
Units are connected in multi-drop (“daisy chain”) configuration. In 2 wire mode, the wires coming in and going out
share the same terminal on the instrument
√
Shield MUST be grounded, but ONLY at one point in the chain.
ASCO 5010 Remote
Display Unit
