53
7.4.3 Termination
Terminal resistor for output terminal of the last PU power supply unit is required when connecting
two or more sets of power supplies using serial link cable or using “RS 485 cable with DB9
connector”.
8 pin connector (RJ-45)
Pin No. name
Terminal resistor
6 TXD-
3 TXD+
5 RXD-
4 RXD+
Please do not use the terminator of the attachment for the product before serial number 11083103.
6.5. COMMUNICATION INTERFACE PROTOCOL
7.5.1 Data format
Serial data format is 8 bit, one start bit and one stop bit. No parity bit.
7.5.2 Addressing
The Address is sent separately from the command. Refer to section 7.7.3 for details.
7.5.3 End of Message
The end of message is the Carriage Return character (ASCII 13). The power supply ignores the Line
Feed (ASCII 10) character.
7.5.4 Checksum
The user may optionally add a checksum to the end of the command. The checksum is "$" followed
by two hex characters. If a command or a query has checksum, the response will also have one.
There is no CR between the command string and the "$" sign.
Example: STT?$3A
STAT?$7B
7.5.5 Acknowledge
The power supply acknowledges received commands by returning "OK" message. If an error is
detected, the power supply will return an error message. The rules of checksum apply also to the
acknowledge.
NOTE
The address (ADR n) command must return an “OK”
response before any other commands are accepted.
12Ω(above 0.5W)
12Ω(above 0.5W)
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