Physical
Interface consists of a DB9/female to DB9/female connection through shielded cable. Through this cable, data signals are routed according to RS232 protocol, at 19200 bps, 8 bit data, no parity, one stop bit (19200/8N1).
Data transfer
Transfer takes place in asynchronous transmissions in both directions. For data transmission, characters from ASCII code 32 to 126 are used. At the end of a transmission, a newline character (ASCII code 10) is sent. The recipient begins processing a message after receipt of this newline character.
GCC software must read transmissions from PB-B03 as soon as it receives notice of incoming data. PB-B03 may stop further transmission and switch matrix monitoring while it is waiting for data to be read from the serial line by the GCC. PB-B03 must provide appropriate safety measures to shut down the lamp matrix if it cannot maintain tolerable strobe timings there due to congestion of the serial line.
Protocol
The objective of the protocol is to transfer one byte of address information from GCC to PB-B03 or PB-B03 to GCC. Additionally, the desired or observed direction of change (on->off, off->on) has to be transmitted. Addressing is out of scope for this document.
Each sender transmits data in the following way:
0xAA:XXX\n AA Hexadecimal address XXX Desired/observed state: " ON" | "OFF" \n Newline character (ASCII 10 decimal)
If, for example, GCC wishes to turn on lamp matrix output 0x3c, if would send "0x3c: ON\n" to PB-B03. If in turn PB-B03 notices a switch at address 0x44 having opened, it sends "0x44:OFF\n" to the GCC.
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