K R A ME R E LE CT R O N IC S L T D .
Contents 1 Introduction 1 2 2.1 Getting Started Achieving the Best Performance 2 2 3 3.1 3.2 4 4.1 4.2 4.
1 Introduction Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been providing a world of unique, creative, and affordable solutions to the vast range of problems that confront the video, audio, presentation, and broadcasting professional on a daily basis.
2 Getting Started We recommend that you: • Unpack the equipment carefully and save the original box and packaging materials for possible future shipment • Review the contents of this user manual Use Kramer high performance high resolution cables Use only the power cord that is supplied with this machine i 2.1 Go to http://www.kramerelectronics.com to check for up-to-date user manuals, application programs, and to check if firmware upgrades are available (where appropriate).
3 Overview The VS-4228 is a high-performance bidirectional matrix switcher for RS-422 control signals. It can connect multiple ports to create from one to four bidirectional communication groups.
4 Figure 1: VS-4228 8-Port RS-422 Matrix Switcher Front Panel # Feature 1 Power Switch Function Illuminated switch that turns power ON and OFF 2 MASTER Buttons Select the MASTER to switch to the SLAVE 3 SLAVE Buttons Select the SLAVE to which the MASTER is switched 4 ALL Button Pressing ALL before pressing a MASTER button, connects all SLAVE devices to that MASTER 5 OFF Button Pressing OFF after pressing a SLAVE button disconnects the MASTER.
VS-4228 – Overview Figure 2: VS-4228 8-Port RS-422 Matrix Switcher Rear Panel # Feature Function 10 RS-422 9-pin D-sub Connectors RS-422 bi-directional ports (1-8) 11 CONTROL RS-485 Terminal Block Connector Connector for external RS-485 control (PINOUT: G, -, +) 12 CONTROL RS-232 IN 9-pin D-sub Connector Connect to the PC serial port 13 CONTROL RS-232 OUT 9-pin D-sub Connector Connect to the RS-232 IN port of the next unit 14 Power Connector with Fuse AC connector enabling power supply to t
3.2 About RS-422 RS-422 control switchers differ substantially from video and audio switchers in both design and in operation, as Sections 3.2.1 to 3.2.6 describe. 3.2.1 Signal Terminology Connections are between master and slave or controller and controlled devices, rather than the regular In and Out or source and destination devices. The difference is not merely one of semantics but a vital distinction when trying to understand the concept of RS-422 technology.
A master device always transmits over pins 3 and 8 and receives over 2 and 7. A slave device always transmits over pins 2 and 7 and receives over 3 and 8. The communication path must be kept clear between the master and slave units in both directions, since the slave device must respond to any command transmitted by the master. If the master receives no response from the slave, the master cancels the communication with the slave machine and sometimes flags a message: no communication.
Some older broadcast equipment contains 3 RS-422 connectors; RS-422-In, RS422-Out and RS-422-In/Out. You can only connect a master to a RS-422-In port and you can only connect a RS-422-Out port to a slave. When connecting to a RS422-In/Out port the unit changes dynamically, automatically reconfiguring the 9-pin D-sub port pins to be either a master or a slave. 3.2.6 More Than One Slave Communication between one master and one slave is simple.
4 Connecting the VS-4228 i Always switch off the power to each device before connecting it to your VS-4228. After connecting your VS-4228, connect its power and then switch on the power to each device. To connect the VS-4228 as illustrated in Figure 5: 1. Connect ports 1 through 8 to all master and slave devices using 9-pin D-sub (M) connector cables. Not all ports have to be connected. The power cord is not shown in Figure 5. 2.
4.1 Connecting a PC or Controller to the RS-232 Port You can connect to the unit via a crossed RS-232 connection, using for example, a PC. A crossed cable or null-modem is required as shown in method A and B respectively. If a shielded cable is used, connect the shield to pin 5. Method A (Figure 6)—Connect the RS-232 9-pin D-sub port on the unit via a crossed cable (only pin 2 to pin 3, pin 3 to pin 2, and pin 5 to pin 5 need be connected) to the RS-232 9-pin D-sub port on the PC.
4.2 Connecting a PC or Controller to the RS-485 Port You can operate the VS-4228 via the RS-485 port from a distance of up to 1200m (3900ft) using any device equipped with an RS-485 port (for example, a PC). For successful communication, you must set the RS-485 machine number and bus termination.
4.3.1 Cascading Via the RS-232 Control Interface Connect the PC to units as described in Section 4.1 and shown in Figure 8. Use a straight cable and connect pins 2 to 2, 3 to 3 and 5 to 5. Figure 8: Cascading Units via the RS-232 Control Interface 4.3.2 Cascading Via the RS-485 Control Interface To connect an RS-485 connector on one VS-4228 unit to an RS-485 connector on another unit: 1. Connect the “+” PIN on the first VS-4228 unit to the “+” PIN on the second VS-4228 unit 2.
3. If shielded cable is used for an RS-485 connection, connect the shield to the Ground PIN. Figure 9 illustrates the RS-485 line that connects: • Between each VS-4228 unit • To the PC via a Kramer Tools VP-43xl Interface Converter (connect the PC’s 9-pin D-sub COM port to the “RS-232 in” 9-pin D-sub (F) port on the VP-43xl.
5 Operating the VS-4228 Referring to the connection diagram in Figure 5, you see the following setup: Master devices: Port 1 – PC Port 2 – VTR Serial Controller Slave devices: Port 3 – Video Player 1 Port 4 – Video Player 2 Port 8 – Video Recorder The following examples show how to operate the VS-4228: 1. To connect the PC to Video Player 2: Press SLAVE 4, then MASTER 1. The following status displays: 2.
4. To disconnect the PC from the Video Player 2 in the previous status: Press SLAVE 4 and OFF. The following status displays: 5. To disconnect all masters: Press ALL, then OFF.
6 Technical Specifications INPUT/OUTPUT: 8 in/out ports on 9−pin D−sub (F) connectors CONTROL: Front panel buttons, RS−485 and RS−232 serial interface (in and out) INDICATORS: 8−character display on the front panel STANDARDS COMPLIANCE: TIA/EIA-422-B and SMPTE 207M OPERATING TEMPERATURE: 0° to +55°C (32° to 131°F) STORAGE TEMPERATURE: -45° to +72°C (-49° to 162°F) HUMIDITY: 10% to 90%, RHL non-condensing DIMENSIONS: 19” x 7” x 1U (W, D, H) rack-mountable POWER SOURCE: 230V AC, 50/60 Hz, (1
7 Default Communication Parameters RS-232 Protocol 2000 Baud Rate: 9600 Data Bits: 8 Stop Bits: 1 Parity: None Command Format: HEX Example (Output 1 to Input 1): 0x01, 0x81, 0x81, 0x81 Ethernet IP Address: 192.168.1.39 TCP Port Number: 5000 Network Mask: 255.255.255.0 Default Gateway: 192.168.1.
8 Hex Codes The following table includes Protocol 2000 hexadecimal codes (the protocol uses 4 bytes of information, data is at 9600 baud, no parity, 8 data bits and one stop bit). Full details are available at our web site: www.kramerelectronics.com.
For the latest information on our products and a list of Kramer distributors, visit our Web site where updates to this user manual may be found. We welcome your questions, comments, and feedback. Web site: www.kramerelectronics.com E-mail: info@kramerel.
