11
2.2 RS-232 Port & ALARM I/O
1 2 3 4 5
9
8
7
6
1.
RS-485 D-
2.
RX:
This pin is one of the RS-232 pins. It connects with the TX pin of another device.
3.
TX:
This pin is one of the RS-232 pins. It connects with the RX pin of another device.
Please refer to the note below on the standard RS-232 9 Pin Cable with Pin 2 and
Pin 3 exchanged; see the pin configuration chart below for details.
4.
RS-485 D+
5.
GND:
Ground contact.
6.
ALARM RESET (INPUT):
This pin connects to an alarm-clear device for clearing an
alarm. (
5V, 20mA
0V(Active)
)
7.
ALARM IN (INPUT):
This is an alarm input that can be programmed in the menu
system to active low. (
5V, 20mA
0V(Active)
)
8.
ALARM OUT (OUTPUT):
This is an alarm output trigger. Connect this to external
devices such as buzzers or lights. (
5V, 20mA
0V(Active)
)
9.
AUDIO OUT:
This provides the unit’s audio signal to a speaker.
The pin configuration chart:
