User`s guide

187

Chapter 4 Features and Functions

Remote Interface Configuration - 34970A

• Modem: This mode uses the DTR/DSR and RTS/CTS lines to control

the flow of data between the instrument and a modem. When the RS-

232 interface is selected, the instrument sets the DTR line true. The

DSR line is set true when the modem is on-line. The instrument sets

the RTS line true when it is ready to receive data. The modem sets

the CTS line true when it is ready to accept data. The instrument sets

the RTS line false when the input buffer is almost full (approximately

100 characters) and releases the line when space is available again.

• The flow control selection is stored in non-volatile memory, and does

not change when power has been off, after a Factory Reset (*RST

command), or after an Instrument Preset (SYSTem:PRESet

command).

• Front-Panel Operation:

FLOW RTS/CTS

34970A Refresh UG.book Page 187 Wednesday, February 17, 2010 12:34 PM