Panasonic BT-LH1850 Operating Instruction - Page 46
RS-485 input/output terminal, Command format
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REMOTE Specifications (continued) RS-485 input/output terminal The RS-485 interface enables external operations. The figures below show RS-485 input/output terminal pin arrangement and connections. TSL protocol version3.1 or version4.0 is supported. Make sure that the same TSL protocol versions are used on external control devices and the monitor. For information on specific systems using RS-485 input/output terminal, contact your supplier. Connection example External control device RS-485 IN RS-485 OUT RS-485 IN RS-485 OUT RS-485 IN RS-485 OUT • A loop-through connection using the RS-485 input and output terminals allows operation of multiple monitors (up to 32 monitors). • Connect a terminator (120 Ω) between the first and second pin of the OUT (output) terminal on the last monitor in the chain. Connectors and signals Connector: 8-pin RJ-45 connector 1 2 3 IN 4 5 6 7 8 1 2 3 OUT 4 5 6 7 8 Pin number IN OUT 1 3 2 6 3 1 4 4 5 5 6 2 7 7 8 8 Signal RXD+ RXDTXD+ N.C. N.C. TXDN.C. GND Description Received data (+) Received data (-) Send data (+) Not connected Not connected Send data (-) Not connected Ground Communication parameters Synchro system Transfer rate Parity Data length Stop bit Flow control Asynchronous 38,400 bps EVEN 8 bit 1 bit None Command format STX (02h) Header (ID) Command Data EXT (03h) The header (ID) is 8-bit data. Use the RS-485 ID SETUP function in the SYSTEM CONFIG menu to set up. Setting the most significant bit using external control device allows you to switch between TSL protocol support and "Setting command" (→page47) / "Query command" (→page49) support. Example: RS-485 ID SETUP 31 setting = (hexadecimal conver- sion) Header 1Fh (for support of commands listed below) Header 9Fh (for TSL protocol support) When 0 is set in RS-485 ID SETUP, connected multiple monitors can be controlled. Response formats 1. Setting command response STX (02h) Command EXT (03h) 2. Query command response STX (02h) Data EXT (03h) 3. Error response STX (02h) Error code Error code ER001: Invalid command ER002: Parameter error EXT (03h) When 0 is set in RS-485 ID SETUP, operation is enabled but responses are not. After receiving a monitor response command, there should be a time lag of approx. 200 ms before a command is transmitted from an external control device. 46