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2.
RS485/422:
TB and TA are acceptable if only RS485 is used. TB is 485 B line
(negative line), TA is 485 A line (positive line). If it is RS422, it needs to
connect RA and RB, and connect the positive and negative lines of 422. The
485 can carry 256 loads. The longest communication distance is 1200 meters.
Generally, it is necessary to use terminal resistance when the RS485 line
exceeds 300 meters, and the terminal resistance of 485 is 120 ohms.
3.
Network port:
connect 10M/100M network cable and support automatic
crossover.
4.
RS232:
DB9 male head is adopted, and the needle sequence of RS232 is
shown in figure 5.
Figure 5 RS232 Interface and Dial Code
The definition of corresponding needle is shown in the following table:
Table 2 RS232 Line Sequence
Item Name Input / Output
Instruction
2
RXD
Input
receiving pin of the serial device server
3
TXD
Output
sending pin of the serial device server
5
GND
/
Ground wire
4
DTR
Output
Same as RTS
pin1
pin5
pin6
pin9
DEF Switch
