Aria-130 Digital Key Telephone System
Issue: 1.2
Installation Manual
93
3.5.2 RS-232C Wiring on MPB and SIU
MPB contains one standard RS-232C interface and SIU on MPB contains one standard RS-232C
interfaces. RS-232C is connected by 9-pin “D” connector as shown in Figure 3.5.2. Wiring connector for
RS-232C must include the Clear to Send(CTS) lead if it is enabled by Switch position 2 of the MPB. It is
recommended that the communication setting is 19200 BPS, 8 bits, no parity and 1 stop bit. But CN4 for
SMC1 Port dose not support the RTS, CTS signal.
Cable for the connection with Terminal(DTE) is not supplied by LGE because of getting it easily.
For various application, Administration Programming is required according to the desired application.
Figure 3.5.2 Pin assignments and wiring of DB25 and DB9 for RS-232C
Note:
1.
Protective Ground (Frame Ground) may be used between DTE and DCE(GDK system) for
more stable communication. And it is recommended.
In DTEs and DCEs, protective ground (frame ground) is a point which is electrically bonded to the
equipment frame. Protective ground (frame ground) is not an interchange circuit in RS-232C
standard.(EIA/TIA-232-F) If bonding of the equipment frames of the DCE and the DTE is necessary, a
separate conductor should be used which confirms to the appropriate national or local electrical
codes.
2
3
4
6
7
8
5
2
3
4
6
7
8
5
TD
RD
DSR
DTR
CTS
RTS
SG
RD
TD
DTR
DSR
RTS
CTS
SG
DB-9 connector
for RS-232C of
CN21 on MPB
and SIU on MPB
DB-9 connector
for RS-232C
on Terminal
2
3
4
6
7
8
5
3
2
20
6
4
5
7
TD
RD
DSR
DTR
CTS
RTS
SG
RD
TD
DTR
DSR
RTS
CTS
SG
DB-25 connector
for RS-232C
on Terminal
Name Function
TD
Transmitted Data
RD
Received Data
RTS
Request To Send
CTS
Clear To Send
DTR
Data Terminal Ready
DSR
Data Set Ready
DB-9 connector
for RS-232C of
CN21 on MPB
and SIU on MPB
