GDK-100
DIGITAL KEY TELEPHONE SYSTEM
94
3.5.2 RS 232C WIRING on MPB and SIU
MPB contains one standard RS 232C interface and SIU contains two standard RS 232C interfaces. RS
232C is connected by 9-pin “D” connector as shown 3.10. 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 9600 BPS, 8 bits, no parity and 1 stop bit.
Cable for the connection with Terminal(DTE) is not supplied by LGIC because of getting it easily.
For various application, Administration Programming is required according to the desired application.
!
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 RS232
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
on MPB and SIU
DB-9 connector
for RS-232C
on Terminal
Figure 3.5.2
Pin assignments and wiring of DB25 and DB9 for RS-232C
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-9 connector
for RS-232C
on MPB and SIU
DB-25
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
SG Signal
Ground
Содержание GDK-100
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