2.2. DESCRIPTION
VIRAP * JCT-ASCII to MODBUS-RTU converter ADA-4040PC8 is a device that allows you to connect VIRAP * JCT1 controllers
communicating with the JCT-ASCII protocol to the RS-485 bus to which devices communicating with the MODBUS-RTU protocol are
connected. At the same time, the converter can change the baud rate and format of transmitted data between the JCT-ASCII protocol
port and the MODBUS-RTU protocol port. Depending on the configuration, you can set the baud rate, number of data bits, parity
check or no parity, as well as the number of stop bits. The settings may be different for JCT-ASCII and MODBUS-RTU port.
Additionally, ADA-4040PC8 separates JCT controller from RS-485 MODBUS-RTU bus. Galvanic separation provided by
ADA-4040PC8 protects the system built on the RS422 / RS485 bus and increases its reliability. ADA-4040PC8 supports asynchronous
data transmission with baudrate up to 230.4 kbps through two or one pair of twisted pairs connected to screw terminals. The device for
its operation uses the lines RX +, RX-, TX + / A, TX- / B led to the terminal strips. Up to 32 ADA-4040PC8 devices operating in half
duplex mode can be connected to the RS485 / RS422 bus. Overvoltage protection on each RS485 / RS422 line is made on the basis
of 600W over voltage diodes and fuses.
Fig 1. ADA-4040PC8 view and location of SW1
2.3. SUPPORTING CONTROL SYSTEMS OF THE VIRAP* COMPANY
ADA-4040PC8 converter supported controllers JCT1 series of the VIRAP*
https://www.virapsales.com. company
4
ADA-4040PC8
Power Supply
10 - 30 VDC
RS-485 4-wires
or RS-422
RS-485
2-wires
RS-485
2-wires
RS-485 4-wires
or RS-422
62mm
53mm
10
m
m
10
m
m
MODBUS-RTU
VIRAP
JCT-ASCII
90
m
m
(SW1)
G
N
D
T
X
+
/A
T
X
-
/B
R
X
+
R
X
-
(RS485/RS422)
N
C
N
C
N
C
G
N
D
T
X
+
/A
T
X
-
/B
R
X
+
R
X
-
(RS485/RS422)
V
-
V
+
10 – 30
VDC
PWR
TX
RX
ADA-4040PC8
VIRAP JCT-ASCII to MODBUS-RTU
PROTOCOL CONVERTER
RS-485/422
RTU
RTU
JCT
