16
Fig. 17 — RTU Open Controller Address Switches
Fig. 18 — Network Wiring
MODBUS
The RTU Open module can speak the Modicon Modbus RTU
Protocol as described in the Modicon Modbus Protocol Refer-
ence Guide, PI--MBUS--300 Rev. J. The speed of a Modbus
network can range from 9600 to 76.8K baud. Physical Ad-
dresses can be set from 01 to 99.
JOHNSON N2
N2 is not a standard protocol, but one that was created by John-
son Controls, Inc. that has been made open and available to the
public. The speed of N2 network is limited to only 9600 baud.
Physical Addresses can be set from 01 to 99.
LONWORKS
LonWorks is an open protocol that requires the use of Echelon's
Neuron microprocessor to encode and decode the LonWorks
packets. In order to reduce the cost of adding that hardware on
every module, a separate LonWorks Option Card (LON-OC)
was designed to connect to the RTU Open controller.
This accessory card is needed for LonWorks and has to be ordered
and connected using the ribbon cable to plug J15 (see Fig. 19).
The RTU Open controller baud rate must be set to 38.4k to com-
municate with the LonWorks Option Card. The address switches
(SW1 and SW2) are not used with LonWorks.
LOCAL ACCESS
Wall Mounted Equipment Touch
The Equipment Touch is a wall mounted interface used to con-
nect to the RTU Open controller to access the control informa-
tion, read sensor values, and maintenance. This is an accessory
interface that does not come with the RTU Open controller.
Wire the Equipment Touch to the RTU Open controller J13 lo-
cal access port. There are 2 password protected levels in the
display (User and Admin). See the Equipment Touch Installa-
tion and Setup Guide for more information. See Appendix A
for navigation and screen content.
Field Assistant
Field Assistant is a computer program included with the pur-
chase of the Tech Tool Kit (USB-TKIT). This is a field Tech
Tool to set-up, service, or download application software to the
RTU Open controller and includes a USB Link Cable. The link
cable connects a USB port to the J12 local access port. The
Field Assistant program menu structure is similar to and func-
tions the same as the i-Vu software. See Fig. 20.
Fig. 19 — LON-OC and LON Network Wiring
0
1
2
3
4
5
6
7
8
9
MSB LSB
SW1 SW2
0
1
2
3
4
5
6
7
8
9
LON OC Rev.4
Net
1 2
J15
COMM
OPTION
Network
Connector
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