RTE-V830-PC
USER’ S MANUAL
8
3.7. SERIAL CONNECTOR (JSIO)
JSIO is a connector for the RS-232C interface controlled by the serial controller (SCC2691). It
is a 9-pin D-SUB connector (D-SUB9) generally used with the PC/AT. All signals at this
connector are at RS-232C level. Its pin arrangement and signal assignment are shown and
listed below.
For connection signals connected to the host computer, the table gives the wirings for both the
D-SUB9 pins and D-SUB25 pins on the host side. (These are general cross-cable wirings.)
1
9
8
7
6
5
4
3
2
JSIO Pin Arrangement
Pin
Signal name
Input/
output
Connector pin number on
the host side
D-SUB9
D-SUB25
1
NC
2
RxD(RD)
Input
3
2
3
TxD(SD)
Output
2
3
4
DTR(DR)
Output
1, 6
6, 8
5
GND
5
7
6
DSR(ER)
Input
4
20
7
RTS(RS)
Output
8
5
8
CTS(CS)
Input
7
4
9
NC
JSIO Connector Signals
3.8. CPU TEST PINS (J1)
The CPU test pins are connected to the corresponding CPU pins. The test pin numbers
correspond to the CPU pin numbers on a one-to-one basis. The test pins can be used to
handle CPU signals for test purposes.
3.9. CLOCK SOCKET (OSC1)
The OSC1 socket is connected to an oscillator used to supply clock pulses to the CPU. The
V830 uses a PLL for system clock generation. The SW1-7 setting specifies the frequency of
the oscillator connected to the OSC1 socket. The frequency must be half or one-third the
internal clock frequency.
The oscillator connected to the OSC1 socket must be of an 8-pin DIP type (half type).
[Caution]
When you have to cut an oscillator or crystal pin for convenience, be careful not to
cut it too short, or otherwise the frame (housing) of the oscillator or crystal may touch a tine in
the socket, resulting in a short-circuit occurring.
