MANUAL P/N 316005 REV: B
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6.2.4 Talk-Only Mode
If switch S1, is OFF at power-up, the interface is in Talk-Only mode. The pressure data from all three
displays will be output in a single message string, separated by commas, approximately every 5 seconds.
When shipped from the factory, the Talk-Only mode is disabled.
6.2.5 Handshake Line Control Switches
Refer to Section 6.4, Theory of Operation for more detailed information on the handshaking mechanism.
Switches DCD, CTS, and DSR, when in the "up" position, force the handshake lines Data-Carrier-Detect
(DCD), Clear-To-Send (CTS), and Data-Set-Ready (DSR), respectively, to a logic true condition. When
shipped from the factory, these lines are forced true.
Figure 6-1 RS-232 Module, Top View
(Controller Cover Removed)
6.2.6 Invert RTS Switch
When shipped from the factory, the Request-To-Send (RTS) control line is set to operate as a modem line
per the RS-232 standard. In some implementations it is necessary to invert this line and connect it directly to
the Clear-To-Send (CTS) line of the host computer.
Switch S2, if OFF when the 316 goes through its power-up sequence, tells the RS-232 interface to invert the
polarity of the RTS line. See Section 6.4, Theory of Operation for more information.
6.3 Operation
Consult the user's manual for the host computer to be sure the protocol being used is in accordance with the
switch configuration you have chosen for the RS-232 module.
Communication with the 316 VGC is via ASCII strings. A message to the 316 consists of a command and a
command modifier, followed by a terminator. The message can contain leading spaces, and the command
and modifier may optionally be separated by spaces or commas. No spaces may appear within the
command or the modifier, only between them.
The terminator expected by the 316 is an ASCII ‘carriage return line feed’, denoted here by CRLF. The
carriage return is optional, and messages terminated with only the line-feed will be accepted. Note that the
CRLF terminator is in general appended automatically by the host computer's interface software to the
message string supplied by the user.
Содержание Granville-Phillips Convectron 316 Series
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