2-4 Receiving & Installation
MN1272
RS232/485 Port
The RS232/485 Port (Figure 2-8) is used to communicate with the COM port of the
PC during setup and programming. The Port is used to communicate with the
controller using RS–232, RS–422, RS–485 or Current Loop (20 mA) operation.
The connection method determines the communication mode, Figures 2-6 and
2-7. The RS232/485 Port connector is a 15 pin D sub type.
Use Baldor RS232 cable, CBL034–501 (9.8 ft, 3m); Gender Changer,
OPT033–501.
Table 2-1
Port connector and pin assignment
Pin
Description
1
Frame Ground
2
RXD
3
TXD
4
+5 V output (Max 100mA)
5
GND
6
CHA–
7
CHB–
8
TX+ 20 mA
9
TX– 20 mA
10
RTS
11
CTS
12
RX+ 20 mA
13
RX– 20 mA
14
CHA+
15
CHB+
Use a null modem cable to connect the panel to a PC for programming, Figure
2-6. The COM port connector is a DB 9 pin female.
Figure 2-6 RS232 Connections
Null Modem Cable Connections
HMI Panel
(DCE)
Computer
COM
Port
(DTE)
RXD – 2
TXD – 3
GND – 5
2 – RXD
3 – TXD
5 – GND
Frame Ground – 1
RTS – 10
CTS – 11
8 – RTS
7 – CTS
232/485 Port
Figure 2-7 RS485 Connections
Twisted Pair Cable Connections
HMI Panel
(DCE)
Computer
COM
Port
(DTE)
TX+ –14
TX– – 6
RX+ – 15
1 – RX+
6 – RX–
4 – TX+
Frame Ground – 1
RX– – 7
Ground – 5
9 – TX–
5 – Ground
232/485 Port