Usl JSD-100 Specifications download pdf (Page 53)

Page 53

RS-232 Interface

The RS-232 interface appears on a DE9F connector on the rear panel. The connector is wired as a DCE device. A

command interpreter accepts ASCII commands (described in Appendix B) over the RS-232 and Ethernet interfaces.

The RS-232 port operates at 38.4kbps, 8N1 (8 data bits, no parity, 1 stop bit), with no handshake.

Description

DCD – Internally connected to pins 4 and 6. Does not need to be connected in most cases.

TXD – The JSD-60 transmits data on this pin.

RXD – The JSD-60 receives data on this pin.

DTR – Internally connected to pins 1 and 6. Does not need to be connected in most cases.

GND – Signal ground.

DSR – Internally connected to pins 1 and 4. Does not need to be connected in most cases.

Internally connected to pin 8. Does not need to be connected in most cases.

Internally connected to pin 7. Does not need to be connected in most cases.

RI – The JSD-60 provides a current limited (900mA) +5V to drive external equipment on this pin.

Appendix B – Automation Commands

These commands are used to query the status of the JSD-60 or change its operation (adjust level, select input,

etc.). The commands are typically sent by an automation system. They may be sent over RS-232 or Ethernet. This

is a subset of the full command set. The full command set includes commands for adjust equalization, etc.

Commands are not echoed by the JSD-60. Commands are terminated by a carriage return (0x0d). Commands are

tab delimited. There needs to be a tab character (0x09) between the command and the first parameter, then

another tab before the second parameter, etc. The JSD-60 responds to every command. Responses are also tab

delimited and are terminated with a carriage return. All commands are lower case and are case sensitive. Note:

Every command generates some sort of response that must be picked up by the command sender. Failure to pick

up these responses can cause buffers in the JSD-60 or the host to fill, possibly halting communications. If the

response is not needed, a simple "eat garbage" routine that loops until the receive buffer is empty should be called

before sending a command.

RS-232

The JSD-60 is a DCE device that transmits on pin 2 of the 9 pin D connector. The JSD-60 receives data on pin 3.

Communications is at 38.4kbps, 8N1 (8 databits, no parity, 1 stop bit).

Ethernet

The JSD-60 listens on port 10001 for TCP connections from other equipment (typically a digital cinema server).

Commands and responses are then exchanged in ASCII.

Automation Command List

The Automation Command List shown in table below. Remember that commands are tab delimited and

terminated with a carriage return. In the table below, the required tab characters are shown as "\t", and the

required carriage return characters are shown as "\r". Consult the next table to determine how to insert a tab or

carriage return in the command string.

The JSD-60 accepts a small number of JSD-100 commands. It interprets the command such that the ending result is

similar to that of a JSD-100. For example, the command to select either COAX1 or COAX2 on a JSD-100 will result in

the COAX input of the JSD-60 being selected.

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Usl JSD-100 Specifications Page 53