Lennox CL50-RoofTop

CLIMATIC™50 – IOM – Rooftops/ Aircoolair CL50-ROOFTOPS-IOM-1107-E
45
BMS
Function
This is used to link a Climatic™ to a BMS network for remote control of the unit.
Description
The Climatic™ 50 can communicate using various protocols:
MODBUS protocol for connection with KP06 (see specific KP06 manual) or other Lennox communication products
(3932 = Modbus)
MODBUS protocol (3932 = Modbus)
LONWORKS system (3932 = LonWorks)
BACNET system (3932 = Bacnet)
TREND system (3932 = Trend)
ADALINK system (3932 = Adalink)
CLIMALINK system (3932 = Climatic)
Tables of MODBUS, LONWORKS, BACNET & TREND addresses are given in an appendix at the end of this manual.
The identification number of each unit can be set (3931) and the communication speed is adjustable between 1200 Bd
and 19200 Bd (3933).
3931 ! Address of the unit on the bus
3932 ! Choice of type of protocol
3933 ! Choice of communication speed
MODBUS protocol
For this option the BM50 must be fitted with the PCO1004850 card
This card is used to interface a BM50 with an RS485 type bus.
The card provides optically coupled isolation between the regulator and the RS485serial network.
On the Climatic™, set point 3932 = ModBus
Transmission Mode = RTU
Baud Rate = set point 3933 (1200/2400/4800/9600/19200)
Word Length = 8
Parity = NONE
Stop Bits = 2
Card Id = set point 3931 (1 to 199)
LONWORKS protocol
For this option the BM50 must be fitted with the PCO10000F0 card
This card is used to interface a BM50 with a LonWorks® network by FTT-10A 78 kbs (TP/FT-10).
On the Climatic™, set point 3932 = LonWorks
Baud Rate = set point 3933 (4800)
Device Id = set point 3931 (1 to 199)
‘Watchdog’ function for theClimatic™50.
The Climatic™50 automatic control system, being passive on the bus, cannot detect all communication failures with the
BMS. Therefore in the event of a communication failure, the unit will continue to function with the last settings transmitted
by the BMS.
To prevent this risk from hindering correct operation of the unit, the BMS must regularly write a non-zero value in word
01h. On its side, the Climatic™50 automatic control system decrements the value of word 01h by 5 units every
5 seconds.
The following points are therefore not taken into account by the Climatic™50 automatic control system program if word
01h is equal to 0 and in this case the latter works with the internally programmed set points.
This function does not prevent writing of the bit or word; these can always be read on the DS50 display (set to BMS
mode by means of the ‘Prg’ button)
Word 01h being available in read/write on our display, we are able to test the BMS mode manually and see the value
decrementing then returning to internal control mode.
Points affected by word 01h
Words: 02H/03H /04H/05H/06H/07H/08H