MAGNET POWER SUPPLY SYSTEM 7000
15
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
3.6.1
Termination using RS 422 or RS 485
As standard there is no termination resistors connected inside the display controller module. An
external termination resistor of 100 Ohm must therefore be added at the end of the
communication cable or the internal 100 ohm resistor must be enabled (short-circuiting strap
ST9). The external resistor is preferable.
Hint. This resistor can be placed inside the last DB 25 plug for the remote line.
When using the RS 485 or the RS 422 line in the multi drop configuration, it is very important
during an address transfer to leave the lines at the "SPACE" state when tri stated. That is when
the line is not driven by any transmitters at all. The "SPACE" state can be utilized by adding
1K Ohm resistors to +5V (non inverting) and GND (inverting) on both the transmit and the
receive lines. The display controller module can provide this by short circuiting ST5-ST8 (use
a thin soldering iron). The 1K resistors increase the noise immunity eliminating noise to be
treated as commands thereby flawing the first character after being addressed.
3.6.2
Partial reset to factory settings
From firmware release version
BCP V1.07
The partial reset to factory settings resets the baudrate and address setting to factory default.
This feature can be used when the baudrate or/and address is unknown and the operator no
longer is able to communicate with the MPS.
To activate the partial reset to factory settings, do following on the front panel (picture of front
panel, see page 12)
1.
Hold the “
▲
” (up) and “
▼
” (down) buttons for min. 5 sec.
2.
Release the buttons and the baudrate and address are reset to factory settings.
After partial reset, the setting for baudrate is:
8 BIT DATA, NO PARITY AND 2 STOPBIT and baud rate 9600
and the address is : 0
