13
2-5. SI-65(A/FA) Hardware Setup
The two 4-position dip switches on the converter allows you to conduct the following setups:
the line monitoring function, the driver control method, terminator enable/disable, and echo
back enable/disable.
SW-A No.1-3 (Baud Rate Setup)
Following communication speed (baud rate) you wish to use, this setup is to set the
internal timer used for the non-communication monitoring circuit and driver control
circuit. Using this timer conducts to monitoring non-communication condition more
than 16 bits in RS-485 line and to control the RS-485 driver.
* Speed
[ 6-2. Communication conditions of serial port]
Speed (bps)
[ ] indicates a representative
example.
SW-A No.1 SW-A No.2 SW-A No.3 Internal Timer
*1
(ms)
Over300 [300, 600]
OFF
OFF
OFF
57
Over 1200 [1200]
ON
OFF
OFF
14.3
Over 2400 [2400]
OFF
ON
OFF
7.1
Over 4800 [4800]
ON
ON
OFF
3.6
Over 9600 [9600]
OFF
OFF
ON
1.8
Over 19200 [19200]
ON
OFF
ON
0.9
Over 38400 [38400, 57600]
OFF
ON
ON
0.45
Over 115.2k [115.2k to 920k]
ON
ON
ON
0.11
*1 The internal timer is accurate at +10 to -10%.
SW-A No.4 (Driver Control)
Selects two kinds of control methods in the RS-422/485 driver control line of the
converter: active and auto.
SW-A
Meaning
OFF
ON
No.4
RS-422/485 transmission driver control
Active
Auto
OFF (Active) Setting
To keep the driver active, set the CP2 of the XPort I/O pin "L"(active). ("H" is for non-
active.) The default setting of CP2 is a low level.
[ 9-4. General-purpose I/O pins]
ON (Auto) Setting
This setting detects the first space bit (start bit) in the string which you wish to send from the
converter to the RS-422/485 line, and automatically makes the driver active. The active status
of the driver keeps from the last space bit in the string being sent until the internal timer time
being set. After that, the driver automatically becomes non-active.
<eg.>9600bps Data 31H SW-A No.1-3 OFF/OFF/ON (1.8mS)
The following chart shows the driver control of the converter.
Mark
Data
Space
Idle
On
Off
Driver
Controll
1
1
1 1
1
0 0 0
0
0 0
start
bit
b0
(LSB)
b1 b2 b3 b4 b5 b6 b7
(MSB)
stop
bit
Driver Active
Inner Timer(1.8ms)
The device is kept active for 1.8ms (internal timer time) after the last space bit.Please do not
let the other device respond within 1.8ms.
