Pilot Communications EGO700, Installation & Operation Manual, Page: 23 / 30

9.3 Terminal specification table
Note: The order of RJ45 from left to right is :The first circuit temperature positive, the
first circuit temperature is negative, the second circuit positive, the second circuit
temperature, the third circuit positive, the third circuit negative, the fourth circuit
positive, and the fourth circuit negative.
9.4 Terminal wiring instructions
9.4.1 Communications wiring
(1) RS-485 communication port, the terminals are marked as 485A+, 485B+.
The RS-485 communication mode allows up to 32 PMC series meters to be
connected to one bus, connected to the host computer through an RS-232/RS-485
converter. Communication cables can use ordinary shielded twisted-pair cables, and
the total length should not exceed 1200 meters. The positive and negative polarity of
the RS-485 ports of each device must be connected correctly, and one end of the cable
shielding layer must be grounded. If the shielded twisted pair is long, it is
recommended to connect a resistance of about 120Ω at its end to improve the
reliability of communication. For the convenience of on-site connection, the positive
and negative polarity of the RS-485 port has two connection ports, and the
communication connection is as follows:
Definition Description Definition Description Definition Description
IA+
A phase current
input line
VA
A phase
voltage
485A+ 485 plus end
IB+
B phase current
input line
VB
B phase
voltage
485B- 485 minus end
IC+
C phase current
input line
VC
C phase
voltage
IO/+
Leakage current into the
line
IA-
A phase current
output line
VN
Voltage
neutral line
IO/-
Leakage current
outgoing the line
IB-
B phase current
output line
L
The power
of fire
S1
Switch volume 1 input
positive
IC-
C phase current
output line
N
The power
of zero line
SG
Switch input common
terminal
RJ45
Standard cable
headers
NC Empty