Filtec FT-70c, Service And Technical Reference Manual

Page: 200 / 243

Chapter 8: Diagnostic and Repair Procedures
8-11
Error Number 117
This error condition indicates there is a Host or MODBUS Serial
Interface Framing Error or Reply Timeout (timeout must be a
minimum of 15 seconds.) Most communication errors are caused
by excessive noise.
Check the termination of RX input.
Check the baud rate (S2-1)
• S2-1 CLOSED = 9600
• S2-1 OPEN = 1200
Check the character size (S2-5)
• S2-5 CLOSED = 8 bit, 1 stop.
• S2-5 OPEN = 7 bit, 2 stop
Check the RX with a Voltmeter. Perform the check when the line is
in a steady state (No transmission).
RS-485
• RX(-A) = GND
• RX(+B) = +5VDC
RS-232
• RX(-A) = -12VDC to -4VDC
• RX(+B) = GND
Error Number 118
This error indicates a host or Modbus serial RX overrun error. The
baud rate may be set incorrectly.
To correct this error, check the baud rate setting which is controlled
by dip switches S2-1 and S2-4:
• S2-1 closed = 9600 baud
• S2-2 open = 1200 baud
Industrial Dynamics Company, Ltd. © Form
40256-0600