Installation and Operations Guide
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ACM-VLX/VLX/EXP/AXM
30
© Honeywell. All Rights Reserved. LT-VLXEXPAXMIOG Rev. 01
Example Transformer for the AXM-1048 ( 48VA max.) is 110 ft. from the
AXM.
To determine the type of wire to use
1. Find the maximum current draw of the EXP (for the EXP-1048, 48 VA).
2. Find the intersection of 48 VA on the vertical (y) axis of the chart and
110 ft. on the horizontal (x) axis.
3. Read the diagonal line to the right of the intersection point. In this case,
this is the 14 AWG wire line. Use 14 AWG wire or larger. (A smaller
AWG designation indicates larger wire.)
Communications connections
This topic describes hardware network connections to the VLX/ACM-VLX and
EXPs/AXMs. Firmware configurations performed over a HyperTerminal
connection are important for connectivity. See “Connecting to the VLX/VLX-
Platinum with HyperTerminal” on page 40.
CAUTION Set up firmware before physically connecting networks. This will
help avoid potential network conflicts and communication errors.
See the BACtalk System Design Guide (LTBT-TM-SYSDSGN) for detailed
information about network architecture.
EXP communications bus
The VLX/ACM-VLX and EXPs/AXMs communicate over a simple 18 AWG
two conductor twisted shield cable bus. Up to eight EXPs/AXMs can connect to
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