CV620-IP / CV620-NDI RS-232 Command Set
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20. RS232 over IP
20.1 Overview of RS232 over IP
RS232 over IP allows you to control this unit from the controller with the IP communication
function via the LAN by using RS232.
You can connect up to 5 controllers simultaneously on one LAN segment.
The communication specifications of RS232 over IP are as follows:
20.2 Interface
RJ-45 10Base-T/100Base-TX (automatically discrimination)
20.3 Internet Protocol
IPv4
20.4 Transport Protocol
UDP
20.5 IP Address
Set by the IP card setting command
20.6 Port address
52381
20.7 Delivery Confirmation/Retransmission Control
Depends on the application
20.8 Coverage
Limited dedicated network in the same segment without going through a bridge connection.
In this section, the device outputting commands, for example, a computer, is called the
controller, and this unit and the devices connected to the same LAN are called the peripheral
device. In the connection using RS-232/RS-422, the controllers and peripheral devices are
connected to a one-direction ring. On the IP communication connection, the controllers and
peripheral devices are connected by star type through a LAN.
RS232/RS422 connection IP communication connection
While the IP communication connection, the address of each device cannot be set in the
RS232 message as it is because the controllers and peripheral devices that are connected
simultaneously are increased. In this case, addresses of the controllers and peripheral devices
that are set in the RS232 message are locked to 0 (for the controller) or 1 (for the peripheral
device).
20.9 Packet Structure
The basic unit of VISCA communication is called a packet [Pic.1]. The first byte of the packet
is called the header and comprises the sender’s and receiver’s addresses. For example, the
header of the packet sent to the SRG assigned address 1 from the controller (address 0) is
81h in hexadecimal. The packet sent to the SRG assigned address 2 is 82h. In the command
list, as the header is 8X, input the address of the SRG to X. The header of the reply packet
from the SRG assigned address 1 is 90h. The packet from the SRG assigned address 2 is
A0h.
Some of the setting commands for SRG can be sent to all devices at one time (broadcast)*. In
the case of broadcast, the header should be 88h in hexadecimal.
When the terminator is FFh, it signifies the end of the packet.
*The broadcast function is not available for VISCA over IP.
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