Xu Ji MCU-801S intelligent multi-serial port server

Xu Ji MCU-801S intelligent multi-serial port server
The NWJ-801B gateway is a hardware and software upgrade version of the NWJ-801, NWJ-801A gateway, NWJ-801B and two others
The hardware and software of the type of gateway are incompatible.The reason for the gateway upgrade is the suspension of the chips used by the NWJ-801 and NWJ-801A gateway.
To avoid the upgrades affecting the drawings, the hardware version is still called NWJ-801A, and the software is called NWJ-801B
Or the NWJ-801Av2. The NTX-802 and NTX-826 communication plug-in use the same program as the NWJ-801 gateway.
NWJ-801 gateway is the background computer and protection in the automation system of CBZ-8000 substation of Xuji Electric Co., LTD
Conform converter between guard rooms.It does not have the Ethernet interface, only the RS-232 / 485 / 422 interface relay protection
The protective device is connected to the system, while converting the IEC103 regulation into the IEC104 regulation and the TCP / 103 used in the relay engineer station
stipulations of an agreement.It has a network port and a serial port, namely "single network single string", two gateways form a double network.Corresponding communication plug-in
Model is NTX-802, because the plug-in consists of two motherboards, so both network ports should be configured.


Xu Ji MCU-801S intelligent multi-serial port server
The NWJ-801 gateway is standard with 4104 standard stations (operator / remote station, up to 8) and 1
TCP103 stations (engineer stations, can connect 3), but the total number of all background can not exceed 9.NWJ-801
No background IP, if no background message within 30 seconds, the connection will be closed.It sends to the main station in the U format and
I format can be confirmed in time, and modify their own send serial number.It does not actively send the U format test frames.Gateway port rate is fixed
For 9600, parity, can bring 8 low-voltage protection devices.Serial port send message interval defaults to 100ms, which is if
With 8 units, all units will poll once for about 1 second.If the real-time requirements are high, the single device data
A large amount or more background number, it is not appropriate to use a gateway with multiple devices.
NWJ-801 gateway performs basic transparent regulation conversion for background commands and device data
Except, after receiving the remote timing command, the gateway first adjusts its clock and then takes the moment when the command is sent to the serial port
The clock of the gateway itself is delivered to the device to ensure the real-time performance of the timing).Except for the fixed frame of the polling command (heavy
Hair interval each extension, such as the 100ms between the first and second, then the second and third
The interval is 200ms), and the gateway does not actively generate any commands on the device.The gateway remembers each command sent from the background
(The timeout time is generally 20s, and the command timeout time is extended accordingly), and the command from the device is returned
The value returns to the corresponding background.If the number of background is more, the timing, total call, degree and recording commands should not be overfrequent, one
The total call interval should not be less than 15 minutes, the remote movement time interval should not be less than 15 minutes, and the call degree interval is not
Should be less than 15 minutes.Multiple background cannot send remote control command to the same control point at the same time, otherwise remote control conflict will occur
network connection


Xu Ji MCU-801S intelligent multi-serial port server
If the gateway and test computer are connected through the switch, use a common network cable.If the gateway and test the computer
For a direct connection, a cross-over network cable must be used.The maximum length of the network cable is 100m, and it is recommended not to exceed 90m to ensure data transmission
Reliability of.
Figure 1 Gateway
2.2 Serial port connection
The serial port connection of the gateway adopts the terminal wiring.Depending on the jumper mode, both RS-485 / 422 wiring is available
 RS-232 wiring can be used, see the schematic diagram above the bottom board and main board.The RS-485 communication line is good in the electromagnetic environment
In the case, the theoretical maximum length can reach 1000m, considering that the electromagnetic environment of the substation is generally relatively harsh, so it is not suitable
Over 100m, it is recommended to use a special communication line with shielding, connecting the shielding layer and the signal ground line to the ground line of the signal terminal
Above, to improve the anti-interference ability, to ensure the reliable operation of the gateway.


Xu Ji MCU-801S intelligent multi-serial port server