BOP HIPWR 111315 3-53FIGURE 3-17. RS 232 IMPLEMENTATIONOnly seven control characters (characters between 00H and 1F H) are acknowledged by thepower supply:• Carriage Return (CR, 0D H)• Line Feed (LF, 0A H)• Back Space (BS, 08 H )• Escape (ESC, 01B H)• XON (011H)• XOFF (013 H)• CAN (018 H)BS deletes the last character entered, with the exception of CR or LF characters. Either the CRor LF character acts as the line terminator, initiating parsing of the ASCII data sent to the BOPby the command originator. When the line is parsed and the commands are sent to the analogprocessor, the BOP sends the line terminator sequence CR LF to the command originator.The ESC character is used for synchronization, causing the BOP to reset its input buffer andreturn a CR LF sequence.The XON character enables the transmitter if XON/XOFF flow control is enabled (see PAR.3.5.3.2.2 and Table 3-16).The XOFF character stops data transmission if XON/XOFF flow control is enabled (see PAR.3.5.3.2.2 and Table 3-16).The CAN character resets the receive and transmit pointers and queues.CAUTION: When the serial port has received an XOFF, the error message “-400, QueryError” will be placed in the queue to indicate the loss of transmitted informa-tion due to a received XOFF character. When XON is received, the unit willtransmit all data in it's buffer followed by the exclamation character (!). This(!) character is not part of any message from the BOP and indicates thetransmission buffer has been cleared and the BOP is idle.
