Operating instructions > 40
Serial I/F 
(Displ-
ayed 
when 
connec-
ted to 
Serial 
Interface)
Parity None: Absence of parity 
bit
Odd: Odd parity
Even: Even parity
Ignore: Do not convert 
the character to ox40 in 
case of parity error.
None
Odd
Even
Ignore
Serial Data 7/8 
Bits
Select Serial bit. 8 Bits
7 Bits
Protocol Select an I/F Busy 
control method.
Ready/Busy
X-On/X-OFF
Ready/Busy & X-ON/X-OFF
Diagnostic Test Select to perform input/
output diagnosis of
RS-232C interface 
signals.
No
Yes
Busy Line Select to set the Busy 
Line.
SSD-
SSD+
DTR
RTS
Baud Rate Select to set the Baud 
Rate.
9,600 bps
4,800 bps
2,400 bps
1,200 bps
600 bps
300 bps
19,200 bps
DSR Signal Select the DSR Signal. Valid
Invalid
DTR Signal Select a method to 
switch a DTR signal of a 
serial interface.
Ready on Power UP
Ready on Select
Busy Time Select the minimum 
time between BUSY to 
READY.
0.2 sec
1.0 sec 
GROUP ITEM  FUNCTION  SETS
ML3320ECO/
ML3321ECO
ML3390ECO/
ML3391ECO