8-2 | IPS-4 Dual Bench (UV / IR) Analyzer
IPS4
IU2BAUD (105) is set by default to 9600
MBPARITY(113) default 1
MBSTOPBIT(114) default 1
MBUSADD (115) default 1
MBUSPORT(116) default 0
MBUSTO(117) default 3000
MBUSPORT should be set to 1 to enable MODBUS RTU operations.
MBUSPORT should be set to 4 to enable MODBUS TCP operations.
Make sure that you rebooted the analyzer after changing the MBUS-
PORT parameter value to 1.
When designing a Modbus RS-485 multi-drop communication system
with the IPS-4 Analyzer, the system designer should consider the follow-
ing:
• The update rate is one time per minute or less. Polling of these regis-
ters more frequently than once a second is not recommended.
• The maximum polling rate of a Modbus multi-drop system is deter-
mined by a number of factors including the number of devices on the
system, the number of registers being polled from each device, the
baud rate in half-duplex operation.
• When operating in MODBUS TCP mode. Use TCP Port 502 for mod-
bus communications.
• Modbus TCP is only available on software version:
2.05 or later (UV)
3.03 or later (Dual Bench)
Calculations, and possibly experimentation, are needed to attain optimal
system operation.
NOTE
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