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SECTION 8
COMMUNICATION INTERFACE
The model 6600 is capable of communicating with a remotely located computer via the RS232
serial interface. Using this interface it is possible to perform all functions that are available on
the front panel.
8.1 RS232 SERIAL INTERFACE
The serial interface is a three wire interface using the signals RX, TX and GND. Each byte of
data is sent in ASCII format using 8 bits per byte, with 1 stop bit, no parity at 9600 baud.
The pin-out of the interface is as follows:
Pin 2 - Transmit (TX)
Pin 3 - Receive (RX)
Pin 5 - Signal ground (GND)
The baud rate, parity, bits per byte, and number of stop bits cannot be altered and is set to
9600, No parity, 8 bits and 1 stop bit respectively.
8.2 COMMUNICATION SYNTAX
All commands to the 6600 are two letter commands. Some commands are used both to read
and write data. Others are used only to read data back from the 6600. If a command is used
to write data then it is followed by the equal sign followed by the data to be written. Each
command must be terminated by a carriage return <CR>. Each value returned by the 6600 is
terminated by a <CR>. No hardware or software handshaking is provided.
Commands are serviced by the 6600 every 250 msec. A string of several commands may be
sent to the 6600 at any time. The maximum string length must not exceed 32 characters. For
proper operation, it is recommended that not more than 3 commands be sent every 250 msec.
A list of all commands is shown below.
Summary of Contents for 6600
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