Communications wiring
RTU Open v3 Carrier Proprietary and Confidential CARRIER CORPORATION ©2016
Integration Guide All rights reserved
12
Johnson N2
To set up the RTU Open for N2
Refer to Appendix D (page 49) for the N2 Protocol Implementation Conformance Statement (PICS).
1 Turn
the RTU Open's power.
Changes made to the switches when the controller is on will not take effect until the power is cycled!
2 Using the rotary switches, set a unique N2 slave address for the RTU Open. Set the
(
) switch to the
tens digit of the address, and set the
(
) switch to the ones digit. Valid N2 slave addresses are 01-99.
To set the N2 slave address to 01, point the arrow on the
(
) switch to 0 and the arrow on
the
(
) switch to 1.
3 Set the Comm Selector DIP switches
and
for the 9600 baud.
Use the same baud rate and communication settings for all controllers on the network segment. The
RTU Open is fixed at 9600 baud, 8 data bits, No Parity, and 1 Stop bit.
4 Set
Comm Selector DIP switches
through
for N2. See example below.
5 Leave
and
in the OFF position. These switches are not applicable to N2.
SW3 Protocol Switch Settings for N2
Off Off Off Off On On
The following example shows the DIP switches set for 9600 baud and N2.
6 Connect the N2 EIA-485 network to the controller's
port. Connect to
,
, and
.
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