Agilent Technologies 75000 SERIES B, E1301B, E1300B Diagcomm Stor, Systcommserpacethrstop? Max

If you are going to use any other setting, you must set up the appropriate settings in the System Instrument using the following commands

COMM:SER[n]:REC:BAUD < rate>	sets BAUD rate
COMM:SER[n]:REC:SBITS < bits>	sets number of stop bits
DIAG:COMM STOR	saves settings so they will be
	kept through a reboot.

NOTE	Because the special formatting for binary files uses all 8 bits, the number of data
	bits must be set to 8 and parity checking must remain OFF for the driver files to
	transfer properly.

Pacing the Data Since the RS-232 interface is asynchronous, it is possible for the computer that is doing the download to overrun the System Instrument. This would cause part of the driver to be lost. To prevent this from happening, you should enable hardware handshake (either RTS or DTR) or software handshake (XON/XOFF).

The default configuration for the E1405 Command Module is for software handshake enabled and hardware handshake disabled. To make sure that software handshake is enabled for the command module use the SYST:COMM:SER:PACE? query. To set up software handshake you can use the following commands:

SYST:COMM:SER:PACE:THR:STOP? MAX

to find the maximum number of characters to fill the input buffer.

SYST:COMM:SER:PACE:THR:STOP < max-20>

to set the threshold for stopping data to the maximum size of the input buffer minus 20 characters.

SYST:COMM:SER:PACE:THR:STAR 0

to set the start buffer level to zero. This makes sure that the input buffer is completely flushed whenever transmissions are stopped.

SYST:COMM:SER:PACE:XON

to enable the software handshake protocol.

The start threshold is not critical as long as it is less than the stop threshold. The stop threshold must be set low enough to handle the maximum number of characters that are likely to be received at the System Instrument after it sends the XOFF signal.

Hardware handshake can be set up to use either the DTR (Data Terminal Ready) line or the RTS (Ready to Send) line. These modes can be set with the SYST:COMM:SER:CONT:DTR IBFULL command (to set for DTR) or SYST:COMM:SER:CONT:RTS IBFULL command (to set for RTS). You may wish to turn software handshake OFF using the SYST:COMM:SER:PACE NONE command, though the system will operate with both protocols enabled. When the input buffer of the System Instrument is not full (number of characters in the input buffer is less than the high threshold), the specified hardware line will be asserted. When either hardware

5-12 Downloading Device Drivers