Kramer Electronics VS-848 - Manual (Page 22)

Connecting the VS-808xl Video/Audio Matrix Switcher
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6.1.2 Setting Connection DIP-Switches
When connecting a PC via the RS-232, set DIP-switch # 8 to ON. When
connecting a PC via the RS-485, set DIP-switch # 8 to OFF.
DIP-switch # 5 enables or disables Reply from the matrix switcher to the
PC. In some applications, it may be desirable for some machines not to
reply to instructions received on the RS-232 and RS-485 ports. If so, set the
Reply DIP-switch to OFF.
6.2 Controlling via RS-232 (for example, using a PC)
You can connect a PC (or other controller) to the VS-808xl via the RS-232
port.
To connect using the null-modem adapter provided with the machine
(recommended method):
Connect the RS-232 9-pin D-type rear panel port on the VS-808xl
to the null-modem adapter and connect the null-modem adapter
with a 9-wire flat cable to the RS-232 9-pin D-type port on your
PC
To connect without using a null-modem adapter:
Connect the RS-232 9-pin D-type port on your PC to the RS-232
9-pin D-type rear panel port on the VS-808xl, as Figure 8
illustrates
Female DB9 (From PC)
PIN 4 Connected to PIN 6
PINS 8, 7, 1 Connected together
If a Shielded cable is used, connect the shield to PIN 5
PIN 5 Connected to PIN 5 (Ground)
PIN 3 Connected to PIN 2
PIN 2 Connected to PIN 3
Male DB9
Figure 8: Connecting a PC Without Using a Null-Modem Adapter
1 The default is for Master (Self Address=1) and this is the recommended setting for a single machine