SECTION 7 - OPERATION
JOHNSON CONTROLS
107
FORM 201.28-NM1.1
ISSUE DATE: 1/31/2018
7
MODBUS Setup Port 2
The YVAA 03478 microboard supports Modbus RS232
or RS485 communications for Port 2 communications.
Port 2 communications can be directed to either TB1
for RS232 or TB2 for RS485.
To connect to the network:
1. Connect your Modbus Network to Port 2 on
the IPU II I/O Board as shown in Figure 19 on
page 105.
2. Set up the YVAA Port 2 (P2) for Modbus
Communications.
To access the communication parameters:
1. Press the PROGRAM key once.
2. Enter the password 5255.
3. Press the (ENTER) key to display the Port 1
(P1) settings.
Set the following parameters:
1. DE Modiîš¿er Address: Set to 1
2. DE Modiîš¿er Offset: Set to 0
3. P1 Protocol: Set to API
4. P2 Protocol: Set to Modbus Server
5. P2 Manual MAC Address: Set to 0-127
(as required by Modbus network)
6. P2 Baud rate: Set to 19.2K (or as required by the
Modbus network)
7. P2 Parity: Set to NONE (or as required by
Modbus network)
8. P2 Stop Bits: Set to 1
9. P2 Hw Select Bit: Set to RS-485 or RS-232
( as required by Modbus network)
Cycle power to the Microboard following port setups.
J13-5 Remote Stop Start must be closed for BAS
remote commands to take effect. If this input is open
the unit will shut down and the panel will display the
message:
REMOTE STOP - NO RUN PERMISSIVE.
E-LINK OR SC-EQ INTERFACE
Communications to a LON network requires a LON
E-Link and Port 2 set for YorkTalk 2. Connected
Services requires a SC-EQ and Port 2 set for YorkTalk
2. To connect to the network:
1. Connect the E-Link or SC-EQ to Port 2 on the
IPU II I/O Board as shown in Figure 19 on page
105.
2. Set up the YVAA Port 2 (P2) for YorkTalk 2
Communications.
To access the communication parameters:
1. Press the PROGRAM key once.
2. Enter the password 5255.
3. Press the (ENTER) key to display the Port 1
(P1) settings.
Set the following parameters:
1. DE Modiîš¿er Address: Set to -1
2. Chiller ID: 0
Reboot required (cycle power) after
settings are changed.
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