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
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
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