800gench2.fm Rev. A 800TCU User’s Guide 2-9
Installation and Operation
Q is space (Hex 20)
<CR> is carriage return (Hex OD)
<LF> is line feed (Hex OA)
The start bit for the carriage return character <CR> begins at the one second mark, +0 to
+1 bit time. Time will continue to output once per second until the port receives another
command.
2.7 RS-232 Talker/Listener Interface Option
The RS-232 Talker/Listener Interface is optional. It is present in your unit only if marked
with an X in the index of this manual. This interface is a serial, asynchronous,
bi-directional data port with RS-232 signal levels. Unless otherwise indicated in the index
of this manual, it sends and receives ASCII coded characters at 9600 bps using one start
bit, eight data bits and one stop bit with no parity. Refer to Chapter 1 for specifications and
connector pin assignment. The commands used to request or enter data or parameters are
described under “I/O Interface Commands”.
2.8 IEEE-488 Interface Option
The IEEE-488 Interface is optional. It is present in your unit only if marked with an X in
the index of this manual. This interface is a parallel, bi-directional data port compatible
electrically, mechanically and functionally with the ANSI/IEEE standard 488-1978. Data
is sent and received using ASCII coded characters. Select the address with the front-panel
keypad key 3 as explained earlier in this Section. Refer to Chapter 1 for specifications and
connector pin assignment. The commands used to request or enter data are described
under “I/O Interface Commands” below.
2.9 I/O Interface Commands
Use the two-character commands listed below to communicate with the I/O interface.
Generally, the command followed by a ASCII carriage return character requests current
data or parameters. To load data, use the same command followed by the data. Many of
the listed commands function only if the corresponding option is installed. The options
installed unit are marked with an X in the index of this manual. Table 2-1 lists the
commands alphabetically.
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