Model 6485 Picoammeter Instruction Manual Remote Operation 9-17
Baud rate
The baud rate is the rate at which Model 6485 and the programming terminal communi-
cate. You can choose from one of the following rates: 57.6k, 38.4k, 19.2k, 9600, 4800,
2400, 1200, 600 or 300.
Make sure that the programming terminal that you are connecting to Model 6485 can sup-
port the baud rate you selected. Both Model 6485 and the other device must be configured
for the same baud rate.
Data and stop bits
The RS-232 can be set to transfer data using seven or eight data bits and one stop bit.
Parity
Parity for the RS-232 interface can be set to none, even, or odd.
Terminator
Model 6485 can be configured to terminate each program message that it transmits to the
controller with any of the following combinations of <CR> and <LF>:
• LF line feed
• CR carriage return
• LFCR line feed, carriage return
• CRLF carriage return, line feed
Flow control (signal handshaking)
Signal handshaking between the controller and the instrument allows the two devices to
communicate to each other regarding being ready or not ready to receive data. Model 6485
does not support hardware handshaking (flow control).
Software flow control is in the form of X_ON and X_OFF characters and is enabled when
XonXoFF is selected from the RS232 FLOW menu. When the input queue of Model 6485
becomes more than 3/4 full, the instrument issues an X_OFF command. The control pro-
gram should respond to this and stop sending characters until Model 6485 issues the
X_ON, which it will do once its input buffer has dropped below half-full. Model 6485 rec-
ognizes X_ON and X_OFF sent from the controller. An X_OFF will cause Model 6485 to
stop outputting characters until it sees an X_ON. Incoming commands are processed after
the <CR> character is received from the controller.
If NONE is the selected flow control, then there will be no signal handshaking between the
controller and Model 6485. Data will be lost if transmitted before the receiving device is
ready.
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