Quantech QWC3050T-200T, Installation Operation & Maintenance

Page: 168 / 186

FORM QWC3-NM1
ISSUE DATE: 11/20/2020
SECTION 10 – MAINTENANCE
QUANTECH
168
BACNET AND MODBUS DATA
COMMUNICATIONS
Data can be read and in some cases modified using
a serial communication BACnet or Modbus network
connection. This information allows communications
of chiller operating parameters and external control
changes to setpoint, load limiting, and start/stop com-
mands.
In some cases, BACnet parameters may need to be
modified. Set the unit switch to OFF then, press 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:
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
XXXXX
REAL TIME ERROR ##
RESET 1 = YES, 0 = NO 0
Note: See Table 29 for error descriptions