14 BACnet and Modbus (-AMB Board
Terminal Block TB1)
Data can be read and in some cases modified using a
serial communication BACnet or Modbus network
connection. This information allows communications of
unit operating parameters and external control changes
to setpoint, load limiting, and start/stop commands.
14.1 BACnet and Modbus Data Communication
In some cases, BACnet parameters may need to be
modified [port P1 (RS485 TB1) and or Modbus port P2
(RS485 TB2, P2 HW select bit set to RS-485)]. If
communications cannot be established check that the
panel has been setting up for the correct communication
protocol. Setting the DE MODIFIER ADDRESS to
minus one, sets the RS485 port TB1 up for York Talk.
For protocols other than York Talk set the correct
parameters then turn the power to the panel off then
back on.
For Bacnet P1 Protocol must be set to Bacnet
and for Modbus P2 Protocol must be set to
MODBUS SRV.
On power up the second line of the display
should read INITIALIZING BACNET.
Modification is accomplished by pressing the
PROGRAM, DOWN ARROW, DOWN
ARROW, DOWN ARROW, DOWN ARROW,
and ENTER keys in sequence. The list below
shows the displays for the values that may be
modified:
1-42
Form 201.26.OI1(11/09)
DE MODIFIER ADDRESS
XXXXX
DE MODIFIER OFFSET
XX
P1 PROTOCOL
XXXXXX
P1 MANUAL MAC
ADDRESS XXX
P1 BAUD RATE
XXXXX
P1 PARITY
XXXXX
P1 STOP BITS
X
P2 PROTOCOL
XXXXXXXXXX
P2 MANUAL MAC
ADDRESS XXX
P2 BAUD RATE
XXXXX
P2 PARITY
XXXXX
P2 STOP BITS
X
P2 HW SELECT BIT
XXXXXX
XXXXXX = RS-232 or RS-485
REAL TIME ERROR ##
RESET 1 = YES, 0 = NO 0
IPU II Port Settings
With unit switch set to OFF press PROGRAM, DOWN ARROW, DOWN ARROW, DOWN ARROW, DOWN
ARROW, ENTER keys in turn and then set the following:
After making settings cycle power. Check the second line of the display on power up. For York Talk Bacnet
(modbus) will NOT be initialized, for Bacnet (Modbus), Bacnet will be initialized.
YORK TALK BACNET MODBUS
TB1 (PORT 1) TB1 (PORT 1) TB2 (PORT 2)
DE MODIFIER ADDRESS -1 AS REQUIRED DONT CARE
NOT -1 NOT -1
DE MODIFIER OFFSET DONT CARE AS REQUIRED DONT CARE
P1 PROTOCOL DONT CARE BACNET DONT CARE
P1 MANUAL MAC ADDRESS DONT CARE AS REQUIRED DONT CARE
P1 BAUD RATE DONT CARE AS REQUIRED DONT CARE
P1 PARITY DONT CARE AS REQUIRED DONT CARE
P1 STOP BITS DONT CARE AS REQUIRED DONT CARE
P2 PROTOCOL DONT CARE DONT CARE MODBUS SVR
P2 MANUAL MAC ADDRESS DONT CARE DONT CARE AS REQUIRED
P2 BAUD RATE DONT CARE DONT CARE AS REQUIRED
P2 PARITY DONT CARE DONT CARE AS REQUIRED
P2 STOP BITS DONT CARE DONT CARE AS REQUIRED
P2 HW SELECT DONT CARE DONT CARE RS485
Reset any real time errors
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