4.7.3
Port 1: RS-232
4.7.3.1
Pin Assignments for Port 1
Port 1 is an RS-232 port with a 9-pin female D-sub connector. It is used as the boot loader
port for upgrading the CPU firmware. The pinout of Port 1 allows a simple
straight-through cable to connect with a standard AT-style RS-232 port. Cable shielding
attaches to the shell.
Pin
Signal
Direction
Function
1
n/c
2
TXD
Output
Transmit Data output
3
RXD
Input
Receive Data input
4
n/c
5
GND
–
0V/GND signal reference
6
n/c
7
CTS
Input
Clear to Send input
8
RTS
Output
Request to Send output
9
n/c
Shell
SHLD
–
Cable Shield wire connection / 100% (Continuous) shielding
cable shield connection
4.7.3.2
RS-232 Point-to-Point Connection
In point-to-point configuration, two devices are connected to the same communication
line. For RS-232, the maximum length is 15 meters (50ft).
2
6
7
8
9
3
4
5
2
6
7
8
9
3
4
5
1
1
The shield must connect to
shell of connectors on both
ends of the cable.
PC 9-Pin
CPU
Serial Port Port 1
9-pin female
9-pin male
(2) RXD
(2) TXD
(3) TXD
(3) RXD
(5) GND
(5) GND
(7) RTS
(7) CTS
(8) CTS
(8) RTS
62
GFK-1503E
VersaMax PLC User Manual
For public disclosure
Summary of Contents for VersaMax PLC
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