Modbus Type; Modbus Rs485 Wiring; Modbus Rtu Communication Configuration; Modbus Communication Options - heat-timer MODBUS RTU RS485 Installation And Operation Manual

MODBUS TyPe

• H eat-Timer Platinum controls can be ordered with or upgraded to MODBUS communication.
• T he Platinum MODBUS communication uses RTU protocol and RS485 wiring.
• W hen upgrading a standard Platinum control to MODBUS communication, the CPU
Board on the back of the Platinum control must be replaced. In addition, the MODBUS
Communication Board must be installed. See "Platinum Control Rear View" on page 1.

MODBUS rS485 WIrIng

• H eat-Timer Platinum control MODBUS communication uses a RS485 connection.
• C onnect the RS485 to the back of the Platinum control's MODBUS Communication Board.
• U se 18 AWG Twisted-Pair cable. The cable length must not exceed 3500 feet.
• T he Ground RS485 terminal (G) MUST be connected to the BMS RS485 Ground.
DO NOT USE the RS485 Connector on the Motherboard for MODBUS communication .
Use the RS485 Connector on the MODBUS Communication Board instead .

MODBUS rTU COMMUnICaTIOn COnfIgUraTIOn

• I f the Platinum control was purchased with or upgraded to a MODBUS communication, some
of the following settings must be configured to guarantee proper communication.

MODBUS COMMUnICaTIOn OPTIOnS

SELECT: MENU/<Maintenance>/Network Settings
SELECT: MENU/<Settings>/<More Settings>/<Remote Interface>/Network Settings
• B efore connecting the Platinum control to the MODBUS network, the user must set the following parameters according to the
MODBUS Network Administrator's instructions.

MaC aDDreSS

Options: From 1 to 247
• T his is a unique ID within the MODBUS network. It must be provided by the MODBUS
Network Administrator.

BaUD

Options: 9600, 19200, 38400
• T he Baud determines the speed of communication.
• B oth the Platinum control and BMS must use the same Baud rate.
• T he communication is fixed to 8 Data Bits, No Parity, and 2 Stop Bits.
MODBUS capable Platinum controls will display --NETWORK PANEL--
on the 2nd row of the display when in screen saver mode .

TrOUBleSHOOTIng

If no communication is the symptom, check the following:
• M ake sure that RS485 A(+) and B(-) terminals polarity is correct. Otherwise, there will be no communication.
• B oth devices must have the same Baud rate. Successful communication depends on matching the Baud rate of both devices.
• C heck that the RS485 G terminal is connected properly.
If intermittent communication is the symptom, check the following:
• M ake sure that the communication cable is of the twisted-pair type.
• R eliable communication depends on the cable length and Baud rate used. Long cable length may require a lower Baud rate.
MODBUS Installation and Operation Manual
alerT
alerT
TO MODBUS neT
--NETWORK SETTINGS--
MAC Address
Baud
Multi-MOD Platinum
All Other Platinum Controls
---- MAC ADDRESS ---
Default: 1
[
------ BAUD RATE -----
Default: 9600
9600
19200
38400
MODBUS
Communication
Board
A(+)
G
B(-)
1
9600
Motherboard
Connect to MODBU
1
RS485 Network
]
3
CPU