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D-100 Dual Network Interface Installation Guide 03/18 - 1015-2 / 35094 Page 7
1.5 NETWORK SIGNAL CONNECTIONS
1.5.1 RS485
Use 18 – 22 twisted shielded cable for RS485, 2-wire (half-duplex) serial
communications. The cable is connected to terminal T1A. Do not exceed 4.4 in-lb (0.5
Nm) of torque when tightening the terminals.
CAUTION
Only qualied service personnel should make connections between the D-100 Flow Display
and the user’s external equipment. ONICON assumes no responsibility for damage caused to the
external equipment as a result of an improper installation.
Terminal
T1A
G terminal only used
for 3-wire installations.
Do not connect shields
to this terminal.
CAUTION
Incoming and outgoing RS485 cable shield wires should be connected together, but must not be
connected to the Btu meter.
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