ABB TCC300, User Manual, Page: 570 / 716

DHCP is disabled, it will cause the control to use the IP address from the IP Address
screen.
RS‑485 Interface (Additional Communication Port)
The MODBUS and DNP3.0 communication protocols were set up to be compatible with
a 2
‑
wire, half duplex RS
‑
485 link of the TCC300 COM1.
A port-powered converter made by B & B Electronics of Ottawa, IL (Model 485LP9TB)
was used to test the two
‑
wire RS
‑
485 link. This converter is available in commercial and
extended temperature ranges. When connecting the RS
‑
485, a 120 Ω resistor must be
connected at the last control connector across A/B. The two-wire RS
‑
485 port assigns Pin
A (+) and Pin B (–). The SH connection on the RS
‑
485 plug should be connected to the
cable shield. The shield should only be connected on one end of the RS
‑
485 cable. If more
than one TCC300 control is connected via RS
‑
485, only one shield/SH connection should
be made. One screen is directly associated with setting an RS
‑
485 network. COM1 port
should be set to RS
‑
485. If using TCC600®, under Communications/Setup/Comm Port
menu, RS
‑
485 should be selected. When selecting RS
‑
485 transmission lines, there are
cables specifically made for this purpose. These cables have a shunt capacitance of 16 pF
or less per foot, and are usually solid wire. Plenum-rated cabling is recommended. The
RS
‑
485 connector is designed to hold 12 to 24 AWG wire.
Section 8
1VAC388793-MB A
Installation
564 TCC300
User Manual