4-48 I/O Communication and Control 5702269-C
Advanced Energy
®
Transmission Parameters
The communications capability of the serial AE Bus port is limited to the following
parameters:
• RS-232, RS-422, or RS-485 transmission standard
• Four baud rates (selected by the DIP switch):
4
RS-232: 1200, 4800, 9600, 19,200
4
RS-422, RS-485: 9600, 19,200, 38,400, 57,600
• Odd parity
• 1 start bit, 8 data bits, one stop bit
• Low-order bytes are transmitted before high-order bytes
The time-out period for Pinnacle Plus+ units is factory set at 0.02 s (that is, no more
than 0.02 s can elapse between bytes or the unit will reset and begin looking for a new
message packet). This can be changed using Command 40.
The host computer must finish one transaction with a Pinnacle Plus+ unit before it
initiates another one, either with the same unit or any other unit.
Note: If you have selected RS-232, the Pinnacle Plus+ unit sends data through pin 2
(TXD.D). This pin must be connected to the receive pin (RXD.D) on the host
computer's PC serial connector. The receive pin is normally pin 2 for a standard
9-pin PC serial port and normally pin 3 for a standard 25-pin PC serial port.
Note: If you are using RS-422 or RS-485, the Pinnacle Plus+ supply sends and
receives data differentially. Thus pin 6 (TR- or R-) and pin 7 (TR+ or R+) are
either RS-485 transmit and receiver lines or RS-422 receiver lines. Pins 8 and 9
are RS-422 transmit lines.
Switch Settings
The DIP switch (see Figure 4-13 on page 4-49 and Figure 4-14 on page 4-49) is used
to set the AE Bus address for each Pinnacle Plus+ supply in a multi-drop
configuration. The DIP switch is located on the rear panel of the Pinnacle Plus+
supply next to the AE Bus port.
7 TR+ / + RS-485 (+) transmit/receive data;
RS-422 (+) received data
8 T- RS-422 (-) transmit data
9 T+ RS-422 (+) transmit data
Table 4-14. AE Bus Host Port Pin Descriptions (Continued)
Pin Pin Name Description
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