Kramer Electronics VS-828 - Manual (Page 15)

Connecting the VS-828 Video / Audio Matrix Switcher
KRAMER: SIMPLE CREATIVE TECHNOLOGY
12
Up to 8 Matrix Switchers may be cascaded for control via a single port by
configuring one Matrix Switcher as a Master (Self Address = 1) 1 , while all
the others are assigned as Slave Matrix Switchers or an ID other than "1".
6.1.2 Setting Connection Dipswitches
When connecting a PC via the RS-232, set dipswitch # 8 to ON. When
connecting a PC via the RS-485, set dipswitch # 8 to OFF.
Dipswitch
# 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
dipswitch to OFF.
In the case of interconnection between more than two RS-485 receivers-
transmitters (including PC), the termination resistor must be disconnected on
all the devices, except for the first (usually the PC) and last units on the
communication line. Dipswitch # 4 connects or disconnects the termination
resistor.
6.2 Controlling via RS-232 (for example, using a PC)
You can connect a PC (or other controller) to the VS-828 via the RS-232 port.
To connect using the Null-modem adapter provided with the machine
(recommended method):
Connect the RS-232 DB9 rear panel port on the VS-828 to the
Null-modem adapter and connect the Null-modem adapter with a
9-wire flat cable to the RS-232 DB9 port on your PC
To connect without using a Null-modem adapter:
Connect the RS-232 DB9 port on your PC to the RS-232 DB9 rear
panel port on the VS-828, as Figure 5 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 5: 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