B
M
S
C
on
f
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g
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r
a
t
i
on
B
M
S
PORT
1
P
r
o
t
o
c
o
l
:
B
AC
n
e
t
M
S
T
P
D
e
t
ec
t
H
ea
r
t
b
ea
t:
Y
e
s
H
ea
r
t
b
ea
t
O
k
:
Y
e
s
BMS PORT 1 Protocol: This setting is for the type of communication card that is
installed in the slot of the dap4 marked “BMS card.” Range of selection is N/A (card
not installed- default), MODBUS (RTU), BACnet MSTP, BACnet TCP/IP (or Modbus
IP), LON and iDAP.
Detect Heartbeat: (Default setting is Yes). The dap4 will determine that the BMS
has gone off-line if the heartbeat point (BV62) does not change after 3 minutes.
Consequently, it will cancel the BMS Off or Standby command and automatically
turn on (if there are no other conditions will keep it off). To ensure reliable
operation with the BMS, the heartbeat point should be toggled (0->1 or 1->0) at
least once a minute. Note: The dap4 also sends a heartbeat (BV33) every 3
seconds to the BMS so that it can also determine that communication is okay.
Heartbeat Ok: should indicate “Yes” when the BMS is operating properly.
B
M
S
C
on
f
i
g
u
r
a
t
i
on
B
M
S
PORT
1
A
dd
r
e
ss
:
1
B
a
ud
R
a
t
e
:
19200
S
t
op
s
:
2
P
a
r
i
t
y
:
N
on
e
This screen is only shown when port protocol is set to Modbus.
BMS PORT Address: Sets the address for the card installed in the BMS slot.
Range of selection is 1 to 128 with a default setting of 1.
BMS Port Baud Rate: Speed of communications with the BMS. Range of
selection is 1200, 2400, 4800, 9600 or 19200 with a default setting of 19200.
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