98
en | Troubleshooting transponders, points, receivers, and alert units
Security Escort
2017.08 | V2.18.1.0 | DOC
Training Manual
Robert Bosch (SEA) Pte Ltd
Symptoms
Probable Cause
Possible Solutions
All transponders on one bus
in communications failure
Power to SE485.
Check 9 V DC adapter for
proper voltage. Red Power
LED should be ON (on
SE485).
Wire between SE485 and
transponder incorrectly
installed.
Check to make sure transmit
from transponder goes to
receive of SE485 and receive
from transponder goes to
transmit on SE485 (RX+ to TX
+, RX- to TX-).
Open, short, or grounded
cable from SE485 to first
splice or transponder.
Use VOM to test cable for
short, open or ground. Repair
or replace cable. Also check
for + - pair reversed.
Wrong cable between SE485
and computer.
Cable should be a straight
through cable to your
computer serial port
connection. Do not use null
modem cable or cable
marked for printer.
Bad SE485 Module.
Replace SE485 Module.
Using third party RS-485
interface.
Due to changes made for
transient protection,
transformer isolation, and link
busy detection, these signals
are not compatible with third
party RS-485 Interfaces.
Replace with SE485
High communications error
count.
Wire between SE485 and
transponder incorrectly
installed.
Check to make sure transmit
from transponder goes to
receive of SE485 and receive
from transponder goes to
transmit on SE485 (RX+ to TX
+, RX- to TX-).
Wrong wire type.
Wire type must be twisted
pair.
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