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Manual-18

SR 2 Communication Protocol

e SR 2 communication protocol follows Rane’s RW 485 specication. e follow-

ing describes the SR 2 implementation.

Physical

e baud rate is 38,400 bps with No parity, 8 Data Bits, 1 Stop Bit (N81) format. e

SR 2 also supports 9600, 19200, 57600, and 115200 bps. When conguring Remotes

used with Rane controllers (RPM 22, 44, 88), the RW 485 baud rate of 38400 bps is

required. At the end of a command message, the Master must release the bus within

10 ms. e SR 2 waits this length of time before transmitting its response. To restore

the SR 2 communication settings to 38400 baud 10 ms delay, apply power while

pushing the encoder in for several seconds until the encoder LED illuminates.

Master/Slave

RW 485 is a master/slave bus network, with only one master in charge, which we de-

ne as the Protocol Master (controller). When the Protocol Master expects a response

from a slave, it relinquishes control of the bus, allowing the slave to drive the RS-485

bus. e slave must then release the bus back to the Protocol Master, and we start

again. e SR 2 is always a slave.

Value Encoding

All numeric values are represented in ASCII decimal format separated by commas.

Values with the MSB set ($80 or larger) are interpreted as potential device addresses.

Syntax

Command messages are sent from the Protocol Master to the SR 2. Response mes-

sages are returned to the Protocol Master from the SR 2.

e SR 2 always responds to the Protocol Master upon receiving a complete command

message at the correct baud rate.

Command and response messages have the same format:

message = <addr> <msgtype> <devtype> <checksum> <command/data> <CR>

<addr> Each device has a unique address in the range [0, 7]. e encoding is one

byte with the MSB set.

For example, if the SR 2’s address switch is set to 5, the controller would send

10000101. ($5 + $80)

e SR 2 always returns its address switch setting plus $80. ($addr + $80)

e address switch must be set in the range [0, 7].

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Rane SR 2 Manuale Utente Pagina 18