4-39
Circuit Description of AUX Board (PCB-7710)
AUX board has the connector for serial communication (non-isolation), and the connector for external device
(non-isolation) for future function. Moreover, it has the connector for connecting with the battery, which is for
the short-term backup.
●
External Connection
COM5 Connector (RS-232C I/O Signal) (CN2)
No.
Signal Name
Remarks
Signal Level
1
RESET
Port Reset
TTL Hi Level Reset
2 NC
Not
connected
――
3
TxD
Serial Transmission Data Output RS232C
4 SG
Signal
GND
5
RxD
Serial Reception Data Input
RS232C
6 +5V
+5V
+5 V Power Supply (150
mA)
7 NC
Not
connected
――
8 NC
Not
connected
――
* The COM5 connector is intended for the bidirectional wireless communications module TCON only.
●
Internal Connector
Backup Power Supply Connector (CN202) Unused
No.
Signal Name
Remarks
Signal Level
1
BATT
Backup
Nominal 4.8 V
2 GND
Backup
battery-
Pin1
Pin4
Pin2
Pin5
Pin3
Pin6
Pin7
Pin8
Содержание DS-8400
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