User`s manual

PK2200 Subsystems s 29
Serial Communication
Two serial ports support asynchronous communication at baud rates from
300 bps to 57,600 bps on 9.216 MHz versions up to 115,200 bps with the
18.432 MHz versions. The serial ports can be configured as follows:
 Two 3-wire RS-232 ports.
 One 5-wire RS-232 port (with RTS and CTS) and
one half-duplex RS-485 port.
The RJ-12 phone jack connector J2 supports full-duplex RS-232 commu-
nication with handshake lines. The RS-485 lines (J1 terminals 18 and 19)
provide half-duplex asynchronous communication over twisted pair wires,
up to 3 kilometers. The RS-232 ports on the PK2200 support a subset of
the RS-232 standard that is in common use.
Serial Channel Configuration
Figure 3-8 illustrates the configuration of two 3-wire RS-232 channels.
Figure 3-8. Two RS-232 Channels
Figure 3-9 illustrates the configuration of one 5-wire RS-232 channel and
one half-duplex RS-485 channel.
Figure 3-9. RS-232 and RS-485
/CTS0
RXD1
TXD1
RXD0
TXD0
Z180
U12
(RS-232)
/RX1: J2-5
/TX1: J2-1
/RX0: J2-4
/TX0: J2-3
RS-232CH1RX
RS-232CH1TX
RXD0
TXD0
JP3
13 11
75
/RTS0
U9
(RS-485)
485-: J1-19
485+: J1-18
TXD1
R11
4.7k
RX485
TXD1
RXD1 = RX485
/RX1 = /CTS0
/TX1 = /RTS0
/CTS0
/RTS0
RXD1
TXD1
RXD0
TXD0
Z180
U12
(RS-232)
/RX0
/TX0
RS-232CH1RX
RS-232CH1TX
RXD0
TXD0
JP3
911
65
U9
(RS-485)
485
485+
78