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Model 880 DEPOSITION CONTROLLER
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SECTION 6.XX
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Parameters: [1,2,3]
Description: If the parameter is 1 or 2 then the Model 880 is commanded to select the 'A' or 'B' I/O
program memory, respectively. This has utility like the SWAP command of the user interface but is explicit
as to the desired active program selection. If the parameter is a 3 then the command queries the I/O
program and replies with a response indicating the condition of the active I/O program. The condition
information includes which bank is active (A or B), what if any errors exist with the I/O program (see error
codes below) and what the I/O program space CRC checksum is. The checksum is a code which is derived
from the symbolic contents (and order) of the rung information and can be used to identify (via signature
value) the I/O program contents. Any changes to the I/O program will result in a modified CRC value. In
this way a quick check of the authorized I/O program can be made without a rung by rung comparison with
a source document. If the number is the same as recorded for the authorized version then it is safe to
assume the program is the intended authorized version.
List of I/O error codes
0 IOERR_GOOD No error, I/O program has acceptible syntax.
1 IOERR_UNREC Unrecognized format for tokens.
2 IOERR_2DEEP Stack nested too deep.
3 IOERR_UNFLW Stack underflow, nothing to pop.
4 IOERR_BADNID Bad node id, wrong # .
5 IOERR_BADMIX Wrong opcode in mix with #.
6 IOERR_PHASE Conflict between usages.
7 IOERR_UNBAL Unbalanced set/clear.
8 IOERR_UNRFI Unreferenced input, being read with nothing to write to it.
9 IOERR_EMPTY Nothing on line at all.
10 IOERR_OUTMM Out of memory.
Returns:
If Q1 or Q2 sent:
[RZCD_AOK]
If Q3 sent:
[RZCD_AOK][err_no] space [bank_code][crc_value]
where err_no is 0..10 (see chart above)
bank_code is either 'A' or 'B'.
crc_value is 1 to 5 digits, ranging from 0 (for blank program) through 65535, depending
on result of 16 bit CRC on rung data.
[RZCD_ILDV] if improper value for parameter arguments.
[RZCD_ILSN] if too many arguments, wrong delimiters, etc..
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Command: R
Mnemonic: EXCT_ioins (I/O insert blank rung)
Parameters: [1..LASTRUNG]
Description: Commands the STC to place an empty rung ({ }) into the active I/O program at rung
number specified, forcing current occupant of the rung and any others after it to be renumbered one higher.
Used to make a gap in rung list so can place useful rung data in proper sequence or location as program
maintenance causes changes in rung contents.
Returns:
[RZCD_AOK] if rung number is valid (between 1 and current end rung)
[RZCD_INHB] if rung number is beyond the "END" last rung identifier.
Use the M999 query which returns "[RZCD_AOK].END nn" to identify the last rung
available for empty rung insert.
[RZCD_ILSN] if too many arguments, wrong delimiters, etc..
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Command: S
Mnemonic: EXCT_iosav (I/O save active bank to alternate)
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