User manual

Chapter 2 Hardware Installation Page 18
Figure 4 Interface Definition
RS-232
RS-232, which is labeled COM/RESET, is used for debugging purposes as well as for hard reset of the
SGT-LD-55-23. Below you may find the pin definition of the RS-232.
Table 1 PIN Definition
Pin Assignment
Name
Description
P1
TXD0
Data Transmit 0
P2
DSR0
Data Set Ready 0
P3
RXD0
Data Receive 0
P4
TXD1
Data Transmit 1
P5
RXD1
Data Receive 1
P6
DTR1
Data Terminal Ready
P7
Hard Reset
Hard reset the unit
P8
GND
Ground
To reset the device, short P7 (Hard Reset) to P8 (GND) for less than 1 second and the system will
reset. If P7 (Hard Reset) is shorted to P8 (GND) for over 5 seconds, the SGT-LD-55-23 LD will be
reset to the factory default settings.