AcquiSuite Ally 12 & 48 User Guide (Rev D)
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P a g e
Protocol Verification
The network protocol is typically specified as part of the installation. BACnet MS/TP and Modbus RTU are
the two communication protocols that operate over an RS-485 serial network and BACnet IP and Modbus
TCP are the protocols over Ethernet. Each combination of interface and protocol require specific registers
settings described below. The scope of this section is to use either the LCD interface or software tools to
quickly confirm or change settings to match an existing specification. Further information and
optimization tips are covered in the section on RTU programming.
Modbus Settings
M
ODBUS
RTU
S
ETTINGS
Device Address
: In a Modbus network each device must be assigned a
unique slave address
. Valid
Modbus addresses are 1-240 (keeping in mind the PS48HD requires 15 addresses beyond Element A or
the PS12HD requires 4 address beyond Element A). The slave address of the power meter. The slave
address sets the register address for
ELEMENT A
. Adjacent elements B, C, D, etc. are accessed by
incrementing the slave address by 1. The slave address of the
AcquiSuite
™
Ally meter needs to be set to
match the address expected by the RTU and is normally part of the network specification. The default
address for element A is 1.
M
ODBUS
TCP
S
ETTINGS
Modbus Port: The
AcquiSuite
™
Ally meter uses the industry standard Port 502 for Modbus. This
port number can be changed, although this is considered an advanced setting and should be left
at 502 unless this generates a conflict on the host system. The port number can only be changed
through a software interface.
BACnet Settings
BACnet Device ID:
In a BACnet network each device must be assigned a
unique Device ID and is common
to BACnet MS/TP and BACnet IP protocols
. Besides the standard ability to change this from a BACnet
explorer tool it may be changed via the Viewer,
AcquiSuite
™
Ally Web App, or LCD.
BAC
NET
MSTP
Device Address: Ally meters are Master devices and as such must use MS/TP addresses in the range from
0-127. This address must be unique on the network.
Max Masters:
The default setting is 127 and does not usually need to be changed.
Max Info Frame:
The default setting is 1 and does not usually need to be changed.
BAC
NET
IP
BACnet Port:
The BACnet default port is 47808 and does not usually need to be changed
BBMD:
The BACnet/IP Broadcast Management Device is set to 0.0.0.0 at default and can be changed
through a software tool to allow discovery across networks.
