CEL-MAR ADA-4040PC6, Руководство пользователя

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Correctness of transmission proceed on NMEA (RS485) and RTU (RS485) interfaces can be checked by readout the errors list by
ADAConfig Software from the converter memory. Frames error counter will be increased, in case of: improper speed set compared to
real speed of data transmission. Parity error counter will be count the errors which can arise in case of misrepresent bytes in
transmitted sign. This counter will not work in case of disable control parity.
To check those counters press the button
[Read transmission errors] , and to delete (zeroing of counters in the memory of the
converter) press [Delete transmission errors] In case of parity errors or frame errors, should be checked the ADA-4040PC6
converter's configuration and correctness connection of RS485 bus to RTU and NMEA converter ports.
After finishing the diagnostics, the SW1 microswitch should be set to the run mode as shown in the table below.
SW1-1 SW1-2
OFF OFF
The yellow LED (located near the SW1) will turn off in the RUN mode.
7. OPERATION
ADA-4040PC6 is bidirectional protocol converter of NMEA0183 to MODBUS-RTU protocols, with possibility of conversion a baud rate,
a data format (number of data bits, parity bit, stop bits) and interface type RS485 to RS422. Additionally, is a separator of NMEA0183
port from MODBUS-RTU port
ADA-4040PC6 reads data from NMEA0183 device, and properly processed write them to registers of MODBUS-RTU protocol
(described in pt. IMPLEMENTATION OF MODBUS-RTU PROTOCOL).
Frames of MODBUS protocol having the errors CRC are rejected by the converter.
Frames of NMEA0183 having the checksum errors are also rejected by the converter.
In case of no respond from NMEA0183 device, ADA-4040PC6 converter responds exception MODBUS protocol (described in pt.
EXCEPTIONS OF MODBUS-RTU PROTOCOL)
Fig.9. Connection of device with NMEA0183 protocol to RS485 MODBUS-RTU bus.
8. IMPLEMENTATION OF MODBUS-RTU PROTOCOL
ADA-4040PC6 protocol converter allows connecting devices with NMEA0183 protocol as SLAVE to RS485 MODBUS-RTU bus. The
length of RS485 bus can be extended (another 1200m) by the use of ADA-4040 repeaters or ADA-4044H HUBs RS485.
The MODBUS-RTU protocol used for communication between ADA-4040PC6 converters and SCADA system or PLC controller enable
easy integration of devices with NMEA0183 in existing automation systems.
8.1. MODBUS REGISTERS TABLE OF STANDARD NMEA0183 SENTENCE
8.1.1. CONVERTER MODBUS REGISTERS TABLE IN - READOUT BY FUNCTION 04 (3X –
REFERENCES) INPUT REGISTERS
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ADA-4040PC6
SCADA
MASTER
MODBUS-RTU
SLAVE
MODBUS-RTU
DEVICE
ADA-1040
ADA-4040PC6
SLAVE
MODBUS-RTU
DEVICE
ADA-4040PC6
RS-232
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GPS
FURUNO GP-170
DOPPLER SPEED
FURUNO DS-80
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