Troubleshooting
Serial Port(s) - No RS-232 Communication
18
Serial Port(s) - No RS-232 Communication
Serial Port(s) - No RS-485 Communication
Table 11. Troubleshooting Procedure for No RS-232 Communication
Probable Cause
Action
OK?
Action
1. Serial settings are incorrect for data trans
-
fer such as Baud Rate, Parity Setting, Data
Bit, and Flow Control.
Verify serial communication settings to
make sure settings are correct for data
transfer.
No
Correct Serial Port comm settings.
Yes
Go to next cause.
2. Bad cable connecting TLS4 to serial device.
Verify if cable is bad.
Yes
Replace cable.
No
Go to next cause.
3. Incorrect DB9 Adapters are used.
Verify serial cable has
Straight
DB9
adapter on one end and a
Null
adapter on
the other end.
No
Install correct adapter(s).
4. Serial Jumpers are installed in incorrect
position(s) (Item 6 in Figure 2).
Remove the console’s cover following the
Display/CPU assembly removal steps 1 & 3
on page 26. Check all jumpers are in RS-232
position(s) shown below:
No
Put jumper(s) in RS-232 position(s).
Yes
Replace Display/CPU Assembly.
Table 12. Troubleshooting Procedure for No RS-485 Communication
Probable Cause
Action
OK?
Action
1. Serial settings are incorrect for data trans
-
fer such as Baud Rate, Parity Setting, Data
Bit, and Flow Control..
Verify Serial communication settings to make
sure settings are correct for data transfer.
No
Correct Serial Port comm set
-
tings.
Yes
Go to next cause.
2. Bad cable connecting TLS4 to serial device.
Verify if cable is bad.
Yes
Replace cable.
No
Go to next cause.
3. Serial Jumpers are installed in incorrect
position(s) (Item 6 in Figure 2).
Remove the console’s cover following the Dis
-
play/CPU assembly removal steps 1 & 3 on
page 26. Check all jumpers are in RS-485 posi
-
tion(s) shown below:
No
Put jumper(s) in RS-485 posi
-
tion(s).
Yes
Replace Display/CPU Assembly.
4. Polarity of wiring is wrong.
Check wiring polarity.
Yes
Rewire connections.
No
Replace Display/CPU assembly.
P2 RS485
J39
J38
P2 RS232
P1 RS485
P1 RS232
P2 RS485
J39
J38
P2 RS232
P1 RS485
P1 RS232
