USB to Serial Converters Manual
Version 2.1
Document Reference No.: CP_000032 Clearance No.: CP#022
Copyright © Connective Peripherals Pte Ltd
27
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Ensure that you have connected the correct pins/terminals according to the tables in section
Error! Reference source not found.
.
-
Signal naming conventions vary between manufacturers. This includes notations A and B for
RS485. Connective peripherals therefore indicate Data + and Data
–
instead. Check the manual
for your serial device to determine which terminal is Data + and which is Data -.
-
Confirm if the jumper settings, such as termination and biasing, are correct for your application.
This will depend on the other devices on your RS-422/RS-485 network and how they are
connected.
-
If your application is receiving additional unexpected zero bytes, the biasing resistors can be
enabled to resolve this. Section 4 gives details of how to enable the biasing resistors for each
model of converter. Note that some ES-U-xxxx do not have internal biasing resistors and so these
would need to be fitted externally.
-
Some application programs cannot work with the Echo enabled. This can be resolved by disabling
the Echo option using the DIP switches or jumpers (depending on model of converter). Section 4
gives details of how to select RS-485 mode without Echo on each model of converter.
7.2
Drivers
Troubleshooting advice for drivers can be found in the Connective Peripherals USB to Serial Converters
Driver Installation Guide (CP_000084) which is available from
