Serial Port Commands:
The following commands are used to communicate with SER-DMXs
and just about any other piece of equipment manufactured by Gilderfluke
& Company. Just by attaching the serial port of your PC, PLC or terminal to
the serial port of the Smart Brick, you can access these commands.
To communicate with the SER-DMX through the serial port, you can
use just about any computer or terminal that has a serial port on it. Some
newer computer designs, like the Apple Macintosh, come with serial ports
which are directly compatible with the RS-422 / RS-485 signal levels the
SER-DMX wants to see. These signal levels are close enough to be used
with the RS-232 signal levels found on most older computers (like most IBMs
and compatibles) with only a simple adapter cable, so long as the wire isn't
too long. To gain the full advantage of the RS-422 / RS-485 signal levels
you will need to use a signal level adapter like our 232conv-09.
If you are using a computer as a terminal you will need to run a
modem or terminal emulation program. These will send everything you
type on the keyboard out the serial port on your computer while printing
on the screen anything that comes in from the SER-DMX through the serial
port. Every copy of Windows comes with HyperTerm or Terminal.EXE, which
are just such programs. Z-Term is available as shareware (free) from most
Bulletin Board Systems and users groups for Macintosh computers. A
modem program will usually have the advantage over a terminal emula-
tion program in that it will allow you to save data to your computer's disk
drives and then send it back to the SER-DMX at a later date. The SER-DMX
uses no screen control codes or ESCape sequences (unless VT-52 compat-
ible mode has been enabled), so it should work on any machine with an
eighty column by twenty-four line display. Machines with other display for-
mats will work, but may not look so neat on the screen.
When configuring your modem program, you should set it for 9600
baud, eight data bits, one stop bit and no parity. You should set handshak-
ing to ‘Xon/Xoff’. Hardware handshaking must be turned off. If your terminal
emulation program supports VT-52 terminal emulation (they all do!), you
should enable it. This will allow faster screen redraws if 'VT-52 compatible'
mode is enabled on the SER-DMX. You should set your program NOT to in-
sert an extra LineFeed (LF) character after each Carriage Return (CR) it re-
ceives. You should also tell it NOT to scroll automatically after the eightieth
column is filled. If either of these are on, the screen will be displayed 'dou-
ble spaced'. This won't cause any problem, but will make it hard to see the
whole screen at one time.
If you have hooked up the SER-DMX to your computer and it still
doesn't seem to respond to the keyboard, the first thing to check is that
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