Johnson N2; To Set Up The Rtu Open For N2 - Carrier RTU Open v3 Integration Manual

Communications wiring

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 off the RTU Open's power.
NOTE 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 MSB (SW1) switch to the
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.
3
Set the Comm Selector DIP switches DS1 and DS2 for the 9600 baud.
NOTE 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 SW3 Comm Selector DIP switches DS3 through DS6 for N2. See example below.
5
Leave DS7 and DS8 in the OFF position. These switches are not applicable to N2.
SW3 Protocol Switch Settings for N2
DS8
Off
The following example shows the DIP switches set for 9600 baud and N2.
6
Connect the N2 EIA-485 network to the controller's J19 port. Connect to Net+, Net-, and SHLD.
RTU Open v3
Integration Guide
DS7 DS6 DS5
Off Off Off
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12
DS4 DS3
On On
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