References of Load Communication Interfaces
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and a adapter with DB-25 plug (one end) and DB-9 plug (the other end) are
required (not the modulating cable of the air-conditioner).
RS232 Pins of Plug
number
Description
1 No conjunction
2
TXD, data transmission
3
RXD, data receiving
4 No conjunction
5
GND, grounding
6 No conjunction
7
CTS, clear to send
8
RTS, request to send
9 No conjunction
RS-232 troubleshooting:
In case of connection failure of RS-232, perform following check:
Check if the computer and load are provided with same Baud rate, parity
check bit, data bit and flow control. The power shall be configured with one
start bit (fixed) and one stop bit (fixed).
Just as described in the RS-232 connector, correct interface cable or
adapter shall be adopted. Note: even if the cable is equipped with right plug,
internal wiring may be incorrect.
The interface cable must be connected to the correct serial port (COM1,
COM2, etc.) of the computer.
Setting of communication
Before communication operation, be sure to match load and PC parameters (as
follows).
Baud rate: 9600 (4800/9600/19200/38400/57600/15200). You may enter
system menu through the board to set communication Baud rate.
Data bit: 8 bits
Stop bit: 1 bit
Check: (none, even, odd)
EVEN All all 8 data bits have even-parity check
ODD All all 8 data bits have odd-parity check
NONE All all 8 data bits have no check
Local address: (0-31, factory set value: 0)
Start Bit Parity=None 8 Data Bits Stop Bit
5.2 USB Interface
Connect the load and the computer using a cable with two USB interfaces
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