Siemens SIMATIC FM 456-2 - Page 42

Installation and Startup
2-24
FM 456-2 Application Function Module Installation, Hardware, and Startup
C79000-G7076-C458-01
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.
:
CTTY COM1
:
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 Pin Connection Pin Signal
E1 / GND U Connected to U E1 / GND
M5 / DCD 1 _ 1
D2 / RxD 2 Connected to 3 D1 / TxD
D1 / TxD 3 Connected to 2 D2 / RxD
S1 / DTR 4 Connected to 6 M1 / DSR
E2 / GND 5 Connected to 5 E2 / GND
M1 / DSR 6 Connected to 4 S1 / DTR
S2 / RTS 7 Connected to 8 M2 / CTS
M2 / CTS 8 Connected to 7 S2 / RTS
M3 / RI 9 _ 9 M3 / RI
9-pin Sub-D socket
(COM1 to
IF 962-COM)
Pin “U” = housing (screen)
Length: maximum 10 m (33 ft.)
9-pin Sub-D socket
(COMx on PG/PC)
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.