TANDBERG RJ45RJ11 manual Communicating with the Video Switch

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Communicating with the Video Switch

Communicating Using VISCA

Note! This section applies only to users wanting to control the switch directly from an external control system connected to Data port 3 on the switch.

The following describes how to communicate with the TANDBERG Video Switch using the VISCA protocol. For details about the protocol implementation, refer to the System Integrators Guide – Interfacing to the TANDBERG Wave 2 Camera.

VISCA Interface Basics

The TANDBERG Video Switch (TVS) uses a RS-232 control interface that resembles the Sony VISCA protocol.

TVS is configured in exactly the same way as a VISCA camera. TVS will always be located first in the camera chain(s).

The main jobs of the VISCA interface in the TVS are:

Select which video source to use

Route VISCA messages to the connected cameras

Control picture resolutions sent to the codec

Cameras chained to the switch will start with id 2. The codec will automatically recognize this and map the cameras accordingly.

VISCA Serial Ports

The switch has a total of 4 serial ports that communicate using the VISCA protocol.

Port 0, on the THSI interface, is always connected to the codec.

Port 1 is the primary VISCA chain for cameras connected to the Switch.

Port 2 is the secondary VISCA chain for the cameras that normally are connected to codec video inputs 2-5. See the section on Enhanced VISCA below.

Port 3 is intended for external control systems, and works in the same way as port 0, but with some limitations on available commands. It is comparable to running the daisy port on a TANDBERG Precision HD Camera in dualvisca mode.

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This article covers the use of port 3 as the control port for the switch. You may use port 0 if you do not intend to use the THSI interface, but only use HDMI out.

Enhanced VISCA

Since the switch has two possible camera chains, all normally formatted commands will be sent to the primary chain. To access the secondary chain, you must first turn Enhanced VISCA on with the SW_eVisca command.

Commands going to the secondary chain must be prefixed with FE 01. Replies from the secondary chain will also be prefixed with FE 01. You will only receive push messages from the secondary chain if Enhanced VISCA is turned on.

Important: Since the switch can receive VISCA from either the codec or an external control system, and since there are two possible camera chains, there are limitations on how commands are issued and answered:

Only one command can be processed at a time

Sending a new command when you receive an ACK from a Sony camera is not allowed. ACK messages will be thrown away by the switch

Reply will always go to the source that issued the command.

Sony push messages will be sent to both sources.

If this is not expected behaviour, an external control system may, of course, be setw to control all connected cameras directly via VISCA.

VISCA Messages

Commands that are prefixed with SW_ are new for the switch. The CAM_ prefix is used for commands that are copied from TANDBERG Precision HD Camera, or are standard VISCA messages.

VISCA Standard Commands

Command Set

 

Command Packet

Comments

 

 

 

 

CAM_IF_Clear

8x

01 00 01 ff

Clear command buffer. Stop any current

 

 

 

operation in progress.

 

 

 

 

CAM_Address_Set

8x

30 0p ff

p = address for this device. If x=8

 

 

 

(broadcast), increase p with 1 before

 

 

 

sending to chain.

 

 

 

 

CAM_Command_Cancel

8x

2p ff

p = Socket ID. Not supported in TVS

 

 

 

 

CAM_Power

8x

01 04 00 0p ff

p = 2: Power on. p = 3: Power off.

 

 

 

 

VISCA Standard Inquiries

Command

Command Packet

Comments

 

 

 

IF_DeviceType_Inq

8x 09 00 02 ff

y0 50 gg gg hh hh jj jj kk ff

 

 

gggg = Vendor ID

 

 

hhhh = Model ID

 

 

jjjj = ROM Revision

 

 

kk = Max sockets

 

 

(No support for this in the TANDBERG

 

 

Video Switch. Ignore it.)

 

 

 

CAM_Power_Inq

8x 09 04 00 ff

y0 50 0p ff

 

 

p = 2: Power on.

 

 

p = 3: Power off.

 

 

 

VISCA Standard Push Messages

Command

Command Packet

Comments

 

 

 

CAM_Network_Change

x0 38 ff

This indicates that cameras have been

 

 

added to or removed from the camera

 

 

chain.

 

 

To avoid issues with (some) Sony

 

 

cameras, the control system or

 

 

codec should delay 9 seconds before

 

 

reconfiguring the chain.

 

 

 

116467.05

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Contents Camera Connecting the Video SwitchDVI Hdmi Sony Mini DIN DTR GND DSRTXD GND RXD Sony Part NumbersInstallation of the Video Switch Command Interface ConfigurationsCommand Interface New Commands Basic FunctionalityCommunicating with the Video Switch Configuration Commands Switch control commandsMisc InquiriesCleaning Power Connection and Hazardous VoltageAccessories Disclaimer

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