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Programmable Hardware Manual (PHM)
© Tibbo Technology Inc.
The Ethernet port of the EM1202EV incorporates
two Ethernet status LEDs). The EM1202EV-RS has another pair of status LEDs
located on top of the board. Two status LED pairs work in parallel.
5.5.1.3
Multi-channel Serial Port
The EM1202EV has four serial ports internally. The EM1202EV-RS has an RS232 port
with DB9M connector, while "-TM" and "-TS" devices have TTL serial port available
through a TTL interface connector, which is a standard pin header with 2mm pitch.
The EM1202EV implements three outputs, four inputs, and one "spare" input (CD).
Each of the three outputs can be used as a TX line of a serial channel, or as a
control output such as RTS or DTR. Input lines can be used as an RX line of a serial
channel, or as a control input such as CTS or DSR. The spare input cannot work as
an RX line. This input is not used by the serial-over-IP application supplied by Tibbo
and will be largely omitted from further discussion. Your Tibbo BASIC/C application
can always use this extra input if you require it.
With three outputs and four inputs, the EM1202EV can be said to offer 3.5 serial
"channels". We say "3.5 channels" and not "four channels" because one channel will
only have RX line and no TX line (remember, there are four inputs but only three
outputs).
DB9M connector pin assignment:
Pin
Name
EM1202EV-RS
#1
CD
Spare input*
#2-4, 6-
9
Lines of the RS232 port, see mapping table below
#5
GND
Ground
*Not used in Tibbo serial-over-IP application. Your Tibbo BASIC/C program can use
this line if needed.
TTL interface connector pin assignment:
Pin
Name
EM1202EV-TM
EM1202EV-TS
#1
CD
Spare input*
#2-8
Lines of TTL serial port, see mapping table below
#9
Setup line input, active low, use open collector driving circuit
