Kramer Electronics VP-84ETH - Manual (Page 30)

Controlling Several RGBHV / Balanced Audio Matrix Switchers
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7.7 Using the TERM: 75 /TTL Buttons
In some graphics and multimedia applications, only 4 channels are used –
RGBS. The sync channel uses Composite Sync format (not separated to
Horizontal and Vertical), and is usually at analog signal levels (1 Volt
approx.). Composite sync channel is rarely of the TTL type.
Use the TERM. 75 /TTL buttons as follows:
Release both buttons when the matrix is to be used in an RGBHV application
Press the H channel button to the 75 position, when a Composite Analog
sync
1
is used
8 Controlling Several RGBHV / Balanced Audio Matrix Switchers
You can connect up to eight single VP-88ETH units with control from a PC
or serial controller via RS-232 and RS-485, or up to seven single units via
RS-485.
8.1 Control Configuration via RS-232 and RS-485
To control up to eight VP-88ETH units – with control from a PC or serial
controller – via RS-232 and RS-485, as Figure 15 illustrates, do the following:
1. Connect the video sources and acceptors, the appropriate audio sources and
acceptors, and the power cord to each VP-88ETH unit.
2. On each VP-88ETH, set the SELF ADDRESS # as required 2
3. Connect the RS-232 port on the first VP-88ETH unit to the PC using the
Null-modem adapter provided with the machine (see section 6.2).
4. Interconnect the RS-485 ports on all the VP-88ETH units: from the
RS-485 port on the first VP-88ETH unit, to the RS-485 port on the second
VP-88ETH unit, and so on – up to the RS-485 port on the eighth VP-88ETH
unit.
1 This should be verified by the user from the specification of the RGBS source
2 Set the first unit to SELF ADDRESS # 1 (Master), the second unit to SELF ADDRESS # 2, and so on - up to SELF
ADDRESS # 8 for the eighth unit