Specifications

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APPENDIX E • SERIAL COMMANDS
90
General Binary Command Form Description
The PSR1212 product accepts serial commands through the RS-232 serial port. The commands are then
channeled along the Expansion Bus network to all interconnected PSR1212 products. The commands provide
the same control as the LCD menu structure, plus many other additional controls.
The RS-232 Serial Port Protocol is 9,600, 19,200, 38,400 (default), or 57,600 baud; 8 bits, 1 stop bit, no parity.
The PSR1212 accepts the commands outlined in the Command table. The binary command structure is
defined in Hexadecimal. The structure of serial commands is as follows:<Header><Argument 1>[ARGUMENT
N] – in binary format without characters or spaces.
Word 0 (32 bits) Word 1 (32 bits) Word 2 (32 bits)
Command Type Port Flags
Type ID Device ID
Command ID Word Count Check Sum
0x40 16 bits 8 bits 8 bits 8 bits 16 bits 16 bits 16 bits
The port bits are arranged as follows:
Bit Port
15 (msb) Serial (RS-232)
14 Expansion Bus
13 Front Panel
12 Command Execution
11 Wall Unit
10 GPIO
9 – 1 Reserved (must be zero)
0 (lsb) Reserved (must be zero)
The flag bits are arranged as follows:
Bit Port
7 (msb) Response
6 Query
5 Absolute
4 - 1 Reserved (must be zero)
0 (lsb) Reserved (must be zero)
When the Response bit is set, the unit will return a response only to the port that generated the command.