Unidirectional polling via RS-232 is no longer working.
Details
Issue
You've probably started BALTECH ID-engine Explorer or another tool of BALTECH
ToolSuite while testing the RS-232 interface. When these BALTECH tools scan
for RS-232 ports, the reader switches to BRP, i.e.
unidirectional communication is stopped.
Solution
Close all BALTECH tools and do a power-on reset on the reader.
Ethernet readers can no longer be found via SLP after a few minutes
Details
Issue
This may happen if the routers/switches have IGMP snooping enabled, but
there's no IGMP querier in the network.
Routers/switches use
IGMP snooping
to forward multicast SLP requests from the host to the readers. For this to work,
an IGMP querier is needed: It sends periodic requests into the network that
cause the host to regularly renew its membership in the relevant multicast
group. If there's no IGMP querier and thus no renewed membership, the
routers/switches will stop forwarding the host's multicasts to the readers
after a timeout. Thus, the readers won't respond to SLP requests anymore.
Solution
There are 2 ways to solve this issue:
Disable IGMP snooping on the routers/switches. Look for an option containing
the key word(s) IGMP, IGMP Snooping, or Multicast. For details, please
check the operation manual.
Set up an IGMP querier in your network. For details, please
check the operation manual for your routers/switches.