Models 2510 and 2510-AT User’s Manual Remote Operations 6-7
Data bits and parity
The RS-232 interface can be configured to send/receive data that is 7 or 8 bits long using
even, odd, or no parity. No parity is only valid when using 8 data bits.
Terminator
The Model 2510 can be configured to terminate each program message that it transmits to
the controller with any of the following combinations of <CR> and <LF>:
<CR> Carriage return
<CR+LF> Carriage return and line feed
<LF> Line feed
<LF+CR> Line feed and carriage return
Flow control (signal handshaking)
Signal handshaking between the controller and the instrument lets the two devices com-
municate with each other about readiness to receive data. The Model 2510 does not sup-
port hardware handshaking (flow control).
Software flow control is in the form of XON and XOFF characters and is enabled when
XON-XOFF is selected from the RS-232 FLOW CONTROL menu. When the input queue
of the unit becomes more than ¾ full, the instrument issues an XOFF command. The con-
trol program should respond to this and stop sending characters until the Model 2510
issues the XON, which it will do once its input buffer has dropped below half-full. The
Model 2510 recognizes XON and XOFF sent from the controller. An XOFF will cause the
instrument to stop outputting characters until it sees an XON. Incoming commands are
processed after the <CR> character is received from the controller.
If NONE is the selected flow control, there will be no signal handshaking between the
controller and the Model 2510. Data will be lost if transmitted before the receiving device
is ready.
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