Operating Manual

Accu-Wave Chapter 8 Serial Ports, Contact Inputs & Special Fcts
TN Technologies 8-17
When a unit is in “Connect” mode, the unit’s setup menus can be accessed (if not in Blind
or Printer mode) and the unit will continue to send updates if “Do data stream in connect
mode” has been enabled. Connect mode is exited when a valid DISCONNECT command
is received.
A unit in Sleep mode will not respond to anything except a valid WAKEUP Command.
Party-Line Commands
Some useful escape codes are:
ESC [ Z# uu CONNECT Command. (uu = unit number, e.g., 01).
ESC O Q DISCONNECT Command
ESC X C SLEEP Command (ANSI)
ESC X D WAKEUP Command
ESC X 1 CONNECT Acknowledge (gauge sends this to acknowledge the
CONNECT command)
ESC X 2 Acknowledge DISCONNECT Command
ESC O V ID REQUEST Command
ESC X 4 ID REQUEST TERMINATED Command
ESC [Yuu;cc;vvdd POLLING Command,
where
uu = unit number (in hex) on party line
cc = command (in hex)
vv = unit number + 3 (in hex)
dd = command number +3 (in hex)
Presently, only three “cc” command values are supported:
86 – Single Data Stream Update on RS-485
8B – Download NVRAM contents to PC on RS-485
8D – Upload NVRAM contents to gauge
Example:
ESC [Y01;86;0489 sends the “Single Update” command to Unit 1.
Party-Line Limitations
The RS-485 party-line uses half-duplex communications. That is, only one system can
send information at any given time. For instance, if you are entering data during the time
window for a gauge to send its output, garbled characters may result. This occurs mainly
when the gauge’s menu system is being accessed in Connect mode. In this circumstance,
you should verify that the gauge received the correct setup information before continuing.