MODBUS Installation and Operation Manual
3
HT# 059266-00A
MODBUS TyPe
• Heat-Timer Platinum controls can be ordered with or upgraded to MODBUS communication.
• The Platinum MODBUS communication uses RTU protocol and RS485 wiring.
• When 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.
Motherboard
CPU Board
A(+)
G
B(-)
PlaTInUM Panel COnneCTeD
TO MODBUS neTWOrK
Connect to MODBUS
RS485 Network
MODBUS
Communication
Board
MODBUS rS485 WIrIng
• Heat-Timer Platinum control MODBUS communication uses a RS485 connection.
• Connect the RS485 to the back of the Platinum control's MODBUS Communication Board.
• Use 18 AWG Twisted-Pair cable. The cable length must not exceed 3500 feet.
• The Ground RS485 terminal (G) MUST be connected to the BMS RS485 Ground.
alerT
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
• If the Platinum control was purchased with or upgraded to a MODBUS communication, some
of the following settings must be configured to guarantee proper communication.
--NETWORK SETTINGS--
MAC Address
1
Baud
9600
MODBUS COMMUnICaTIOn OPTIOnS
SELECT:
MENU/<Maintenance>/Network Settings
Multi-MOD Platinum
SELECT:
MENU/<Settings>/<More Settings>/<Remote Interface>/Network Settings
All Other Platinum Controls
• Before 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
Default: 1
• This is a unique ID within the MODBUS network. It must be provided by the MODBUS
Network Administrator.
---- MAC ADDRESS ---
1
[ ]
BaUD
Options:
9600, 19200, 38400
Default: 9600
• The Baud determines the speed of communication.
• Both the Platinum control and BMS must use the same Baud rate.
• The communication is fixed to 8 Data Bits, No Parity, and 2 Stop Bits.
------ BAUD RATE -----
9600
19200
38400
alerT
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:
• Make sure that RS485 A(+) and B(-) terminals polarity is correct. Otherwise, there will be no communication.
• Both devices must have the same Baud rate. Successful communication depends on matching the Baud rate of both devices.
• Check that the RS485 G terminal is connected properly.
If intermittent communication is the symptom, check the following:
• Make sure that the communication cable is of the twisted-pair type.
• Reliable communication depends on the cable length and Baud rate used. Long cable length may require a lower Baud rate.
