Service manual

32 Siemens-Elema AB E382 E380E 061 01 03 01
Description of functions Servo Ventilator 300/300A
2
3.7 Serial communication ports
26 pole D-sub connectors (N82 and N83) for
RS-232-C data communication. For com-
munication protocol, see Reference Manual
"Servo Ventilator 300/300A, Computer
Interface (Firmware version 2.X)", Order No.
63 14 061 E380E.
The connectors are identical with one
exception; the internal clock can only be set
via N82.
Serial communication is indicated on the
LEDs D6 – D9. See 3.9 LED INDICATORS.
Pin configuration and signal names can be
found in chapter "8. Diagrams".
3.8 Analog input & Digital code
port
44 pole D-sub connector (N84). Optional
input interface.
Pin configuration and signal names can be
found in chapter "8. Diagrams".
300-L24X
D1
D9
3.9 LED indicators
There are 9 green/red LED INDICATORS
mounted on PC 1587. The LEDs are visible
if the control section cover is removed.
LED functions
D1:
WATCHDOG. During startup the LED will
flash for a short moment and then be lit red
for a short moment. It will then be lit green
again.
When the startup test is completed, the
LED indications are as follows:
– Green LED: Microprocessor program is
running.
– Red LED: Program error indication.
– LED not lit: Microprocessor program not
running.