Rockwell Automation 57C435 Processor Module, AutoMax - Manual (Page 44)

CĆ2
Programming Terminal End of Cable
9ĆPin Female Connector
SIGNAL PIN#
RECV ă2
XMIT ă3
CTS ă8
RTS ă7
DTR ă4
DSR ă6
COM ă5
Reliance End of Cable
25ĆPin MaleConnector
PIN# SIGNAL
ă2 XMIT
ă3 RECV
ă4 RTS
ă5 CTS
ă6 DSR
20 DTR
ă7 COM
Figure2
User Serial Ports
All AutoMax Processor module ports except for the port labeled
PROGRAMMER/PORT B" on theleftmost Processor in therack areavailableto
the user to connect to an external device which will be controlled by application
tasks running on the Processor. Refer to the Enhanced BASIC Language
Instruction Manual (JĆ3675) for moreinformation. Notethat with AutoMax
Processor modules, you can use the statements OPEN PORTA or OPEN PORTB.
Note: if you do not enable bit 15 (hardware handshaking) in the SETUP parameter of
the OPEN statement, only pins 2, 3, and 7 of the port you OPEN will be meaningful.
Pin# I/O
Function
2 O This signal contains transmitted data.
3 I This signal contains received data
4 O Transmit status. This signal is true whenever the transmitter is sending
characters. It is used to bracket" a character transmission. It can be
used to enable/disable any type of external equipment, such as a
triĆstate transmit modem, which requires an enable signal to output
characters. Refer to the OPEN statement in the Enhanced BASIC
Language manual (JĆ3675) for details concerning the operation of the
modem enable signal (RTS pin on connector).
5 I This signal enables the transmitter. It must be true for the transmitter to
send a character. This signal is typically used for hardware flow control.
It is meaningful only if hardware handshaking has been enabled.
6 I This signal enables the receiver. It must be true in order for the receiver
to accept characters. If the signal becomes false while a message is
being received, any characters being received will be deleted and an
error will be reported to the application software. This signal is
meaningful only if hardware handshaking has been enabled.
7 Signal ground.
10 O This signal is an isolated +12 Volt which can be used as an enable
or equipment ready indicator. The signal is always on whenever
power is applied to the Processor.
20 O This signal indicates receiver status. The signal is true whenever the
receiver can accept characters, i.e., when the receive buffer is not
full. When the receive buffer fills to within a specified limit (53
characters), the signal is turned off. The signal can be used to
disable another transmitter. It is meaningful only when hardware
handshaking has been enabled.
Seethefollowing pagefor examples.