Technical data

RS485 and RS232 Adapter Installation and Start-up Guide 5-1
Chapter 5 – Fault Tracing
This chapter gives step-by-step diagnostics information for finding out the
causes and corrections to the most common problems with the adapter.
Power LED of the adapter is illuminated, but Receive
(RxD) and Transmit (TxD) LEDs are not blinking
• The master device is not transmitting.
• The cable is not correctly connected to connector X1/
X2 (in RS485 mode) or X4 (in RS232 mode).
• Operation mode (RS485 or RS232) of the adapter is
not correct: Check jumper S3.
Receive LED blinks but there is no response from the
ACS 160 (Transmit LED is not blinking)
• The master device is not using the same communica-
tion settings as the ACS 160.
• The ACS 160 is using the communication settings of
the control panel: Turn power off and then on again.
Receive and Transmit LEDs are blinking, but the drive
does not follow commands given by the master device
• The drive is not in remote control mode.
• The drive parametering is incorrect: Control com-
mands are not accepted from the serial communication
channel.