Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 132)

11Ć4
M
O
D
E
M
XMIT is always enabled
RCV is always enabled
TRANSMIT
RECV
MODEM ENABLE
SIGNAL COM
SIG COM
RECV
TRANS
AutoMax PC3000
3
2
7
5
8
6
CTS
DSR
must be asserted
Wire to a +5 to +12 volt level
external power supply or
user equipment ready pin on
an RSĆ232 computer.
User Equipment
TXD
RXD
Note: You must assert the CTS and DSR signals when
hardware handshaking has been enabled (bit 15 of the
setup parameter in the OPEN statement).
Figure 11.2 Ć Modem Transmit Enable With No Flow Control
AutoMax PC3000
3
2
7
5
8
6
(2) (to user Trans pin)
(3) (to user Recv pin)
(7) (to user Sig Com)
CTS
DSR
User Equipment
TXD
RXD
must be asserted
Wire to a +5 to +12 volt level
external power supply or
user equipment ready pin on
an RSĆ232 computer.
Figure 11.3 Ć Cable Break Detect