Johnson N2; To Set Up The Rtu Open For N2 - Carrier RTU Open v5 Integration Manual

Communications wiring

Johnson N2

To set up the RTU Open for N2

Refer to Appendix D (page 58) for the N2 Protocol Implementation Conformance Statement (PICS).
Turn off the RTU Open's power.
1
NOTE Changes made to the switches when the controller is on will not take effect until the power is cycled!
Using the rotary switches, set a unique N2 slave address for the RTU Open. Set the MSB (SW1) switch to the
2
tens digit of the address, and set the LSB (SW2) switch to the ones digit. Valid N2 slave addresses are 01-99.
EXAMPLE To set the N2 slave address to 01, point the arrow on the MSB (SW1) switch to 0 and the arrow on
the LSB (SW1) switch to 1.
SW1 M S B
0
10's
Set the DIP switches 1 and 2 for 9600 bps baud.
3
NOTE Use the same baud rate and communication settings for all controllers on the network segment. The
RTU Open is fixed at 9600 bps baud, 8 data bits, No Parity, and 1 Stop bit.
Set the remaining DIP switches as follows:
4
N2 DIP switch settings
8
Off
The following example shows the DIP switches set for 9600 baud and N2.
RTU Open v5
Integration Guide
SW2 LS B
0
1's
7 6
Off Off
5 4 3
Off On On
14
2 1
On On
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