9-2
ADS Manual
Establishing a Modbus Connection
The SCADA or process control system connects to the
either through a serial connection using the ADS ExPAC (which
may be housed within the ADS XBUS
™
or a customer-supplied
enclosure) or through a cellular wireless modem in the monitor
using Modbus TCP.
Setting Up a Serial Connection
Two Modbus ports are available on the ExPAC through which to
communicate: RS-232 and RS-485.
Note:
When both connections are available, ADS
recommends using the
RS-485
connection. It has a greater
immunity to noise, supports longer cable runs without
signal degradation, and is easier to wire.
The required port settings are 19200 baud rate, 8 data bits, no
parity, 1 stop bit, and no flow control.
Connecting through the RS-485 Port
When using an RS-485 connection for Modbus communications,
choose a cable that is no longer than 4000 feet (1219 m) in length
with 24-gauge wiring. The cable must include at least one twisted
pair and one ground wire. If the cable extends beyond 1000 feet
(305 m), ADS recommends using 120 ohm termination resistors at
each end of the cable.
Connect the cable to the ExPAC in the following way:
1.
Disconnect (i.e., unplug) the green terminal connector from the
RS-485
port on the top, left side of the ExPAC.
Summary of Contents for Intrinsically-Safe TRITON+
Page 19: ...1 12 ADS TRITON Manual Control Drawing ...
Page 25: ...1 18 ADS TRITON Manual First page of the TRITON ATEX Certificate ...
Page 27: ...1 20 ADS TRITON Manual First page of the TRITON IECEx Certificate of Conformity ...
Page 29: ...1 22 ADS TRITON Manual CSA Certificate of Compliance Page 1 ...
Page 30: ...Introduction 1 23 CSA Certificate of Compliance Page 2 ...
Page 32: ...Introduction 1 25 Sample TRITON Declaration of Conformity Page 2 ...