Assembling the M7-400
8-36
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
8.7.2 Connecting a Programming Device (PG) to the COM Interface
Introduction
To operate your M7-400 without monitor and keyboard, you need a programming
device or PC for initial settings in the BIOS Setup.
This section explains how to connect a programming device via the COM1
interface of an IF 962-COM interface submodule to your M7-400. However, it is
also possible to connect a programming device via the MPI of the M7-400 CPU. In
this case, please refer to Sections 8.7.3 to 8.7.5.
Connecting the M7-400 to a Programming Device
Connect the 9-pin subminiature D connector of the COM1 interface of the interface
submodule fitted in your CPU to the connector of a free COM interface of your
programming device. The following types of connection are possible:
Connection without using control cables
Connection using control cables
Connecting with Control Cables
When the interface control cables are used for data traffic via the COM1 interface,
you need a null modem cable.
This may be necessary when, for example, you enter a console redirection in the
AUTOEXEC.BAT of your CPU:
:
CTTY COM1
:
If the free COM interface of your programming device has a 9-pin subminiature D
connector, you can use Table 8-7 below for the pin assignments of the null modem
cable.
This cable can also be obtained preassembled (see V.24 cables in the chapter on
spare parts and accessories of the
Reference Manual
).
Table 8-7 Null Modem Cable for Connecting a CPU via IF to the COM Interface of a
Programming Device with 9-pin Sub. D Male Connector
Signal Pin Connection Pin Signal
E1 / GND U
connected to
U E1 / GND
M5 / DCD 1 - 1 M5 / DCD
D2 / RxD 2 connected to 3 D1 / TxD
D1 / TxD 3 connected to 2 D2 / RxD
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