Siemens SIMATIC FM 456-2 Installation, Hardware, And Startup page 42

Installation and Startup
Connection with Control Cables
When the interface control cables are used for data traffic via the COM interface,
you need a null modem cable.
This may be necessary when, for example, you enter a console divert in the
autoexec.bat of your FM 456-2.
If the free COM interface of your PG/PC has a 9-pin subminiature D connector,
you can use Table 2-3 below for the pin assignments of the null-modem cable.
This cable can also be procured pre-assembled (see V.24 cables in Chapter 5,
ordering information).
Table 2-3 "Null-modem" Connector Cable for Connecting FM 456-2 via IF 962-COM to the
COM Port of a PG/PC using a 9-Pin Sub-D Connector
Signal
E1 / GND
M5 / DCD
D2 / RxD
D1 / TxD
S1 / DTR
E2 / GND
M1 / DSR
S2 / RTS
M2 / CTS
M3 / RI
9-pin Sub-D socket
(COM1 to
IF 962-COM)
If the free COM interface of your PG/PC has a 25-pin Sub-D socket, you can use
Table 2-4 below for the pin assignments of the null-modem cable.
2-24
:
CTTY COM1
:
Pin Connection
U Connected to
1 _
2 Connected to
3 Connected to
4 Connected to
5 Connected to
6 Connected to
7 Connected to
8 Connected to
9 _
Pin "U" = housing (screen)
Length: maximum 10 m (33 ft.)
FM 456-2 Application Function Module Installation, Hardware, and Startup
Pin Signal
U E1 / GND
1
3 D1 / TxD
2 D2 / RxD
6 M1 / DSR
5 E2 / GND
4 S1 / DTR
8 M2 / CTS
7 S2 / RTS
9 M3 / RI
9-pin Sub-D socket
(COMx on PG/PC)
C79000-G7076-C458-01