8
SI-65(A/FA) Line Monitoring Function
RS-485 communications of two-wire half duplex is required to send data after confirming
that any devices have not sent data into the RS-485 line. The line monitoring function
allows to detect that any devices have not sent data into the RS-485 line, and to conduct
the flow control. To use this function, the flow control of built-in XPort is required to set to
CTS/RTS (Hardware).
RS-485 Line Condition
Flow Control Condition
The period of time from when to detect a space bit of the data
in the RS-485 line sent by another device, to when not to get
to continuously detect a space bit over internal timer time of
the converter, while the RS-485 driver of the converter is not
active.
Prohibits sending data
from the converter to the
RS-485 circuit.
The period of time when not to detect a space bit in the RS-
485 line which another device continuously sends over
internal timer time of the converter, or when the RS-485
driver of the converter is active.
Permits to send data from
the converter to the RS-
485 circuit.
*
This function allows the flow control to operate in a direction of sending only. The
flow control in a direction of receiving does not operate.
2-2. SI-65 Panel Explanation
8.
7.
CONVERTER
SI 65
RS
LAN
422
PWR
SD
RD
DRIVER
ACTIVE
GND
5VIN
D
C
-
IN
1
0
0
B
A
S
E
1
0
L
A
N
485
SD
S
W
‐
B
S
W
‐
A
5.
1.
3.
4.
6.
9.
2.
No.
Name
Explanation
Note
1
Power Supply LED It lights when the SI-65 is powered.
2
Data Status LED
“SD” lights when a data is transmitted from LAN to RS-
422/485 “SD/RD” lights when a data is transmitted from RS-
422/485 to LAN.
3
Driver Status LED It lights when the driver for RS-485 is active.
4
Dip Switch A
To configure line monitoring function and driver control.
[ 2-5. ]
5
Dip Switch B
To configure communication method, terminal resistance, etc.
[ 2-5. ]
6
AC Adapter Jack
A socket to connect to an AC adapter. (Non-polar)
[ 2-7. ]
7
Ethernet Connector Ethernet IEEE802.3 RJ-45 connector 10Base-T/100Base-TX
auto-detection available.
[ 7-5. ]
8
RS-422/485
Terminal Block
*1
5.08mm pitch 6pole terminal block (Press-to-screw type)
Standard Torque:0.25Nm/M3.
[ 2-6. ]
9
Rubber foot
Rubber foot to place the unit horizontally.
[ 7-6.]
*1 Pin assignment of RS-422/485 terminal block
