GM9907-L5
bulk scale controller user’s manual
- 7 -
2.5
Serial Port Connection
GM9907-L5
can provide two serial ports. It is depicted below.One for
RS
-
232
（
Port
TXD
、
RXD
、
GND
）；
the other is
RS
-
485
，（
Port
A
、
B
、
GND
）
.serial ports support
：
MODBUS
mode
，
Cont mode
，
Command mode and Print.
Controller and computer connection diagram:
Connection between GM9907-L5 and a host computer (RS-232):
Connection between GM9907-L5 and a Host Computer
（
RS-485
）
2.6
Touch Screen Calibration
Fisrt use new controller or laid-aside for a long time need to calibrate touch screen,
calibrate instruction:
GM9907-L5 power on, long press any point on the touch screen at the same time,
