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3.2 Smart Star CPU Card Features
3.2.1 Serial Communication
The CPU Card has one screw terminal header for RS-232/RS-485 serial communication
(J3) and one RJ-45 Ethernet jack (J7, SR9150 only). The RJ-12 jack, J6, is reserved for
future use and therefore has no signals. The pinouts are shown in Figure 10.
FD RS-485/3-wire RS-232
Mode 0:
J3
Mode 1:
two 3-wire RS-232
J3
Mode 2:
one 5-wire RS-232
J3
7
6
5
4
3
2
1
7
6
5
4
3
2
1
7
6
5
4
3
2
1
J3
J6
J7
Figure 10. Smart Star CPU Card Serial Pinout
The factory default for the CPU Card is one RS-232 (3-wire) and one RS-485 serial chan-
nel, corresponding to Mode 0 in Figure 10. The other modes shown in Figure 10 are set in
software via the Dynamic C serMode function call (see Section 4.5, “Serial Communica-
tion Calls”).
3.2.1.1 RS-232
The CPU Card’s RS-232 serial channel is connected to an RS-232 transceiver. The trans-
ceiver provides the voltage output, slew rate, and input voltage immunity required to meet
the RS-232 serial communication protocol. Basically, the chip translates the Rabbit 2000’s
0 V to +Vcc signals to RS-232 signal levels. Note that the polarity is reversed in an
RS-232 circuit so that +5 V is output as approximately -10 V and 0 V is output as approx-
imately +10 V. The transceiver also provides the proper line loading for reliable communi-
cation.
The maximum baud rate is 115,200 bps. RS-232 can be used effectively at this baud rate
for distances up to 15 m.
The Rabbit 2000 serial port C TXD and RXD signals are presented either as RS-232 TX
and RX or as RTS/CTS handshaking, depending on the mode selected with the Dynamic C
function serMode . The RS-232 signals are available on screw terminal header J3.
32
Smart Star (SR9000)
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