THE V180/AT180 PARAMETER SET 6. PARAMETER SET STRUCTURE The parameter set is a block of 600h (1536d) bytes of binary data. In summary, the set is arranged as follows. The OFFSET value is the position of the start of each field, in hex bytes relative to the start of the parameter set. LENGTH is the size of the field in hex bytes. Sizes noted in DESCRIPTION are decimal bytes. 6.1 FIELDS WITHIN THE PARAMETER SET

Item Offset Length Description PSTYPE 0 2 Parameter set type identifer word PSID 2 20 32-character parameter set name string STAMP 22 14 20-character Pset creation date/time string MODE 36 2 Operating mode word SCAN0 38 24 Acquisition channel 0 control block SCAN1 5C 24 Acquisition channel 1 control block SCAN2 80 24 Acquisition channel 2 control block SCAN3 A4 24 Acquisition channel 3 control block SCAN4 C8 24 Acquisition channel 4 control block SCAN5 EC 24 Acquisition channel 5 control block SCAN6 110 24 Acquisition channel 6 control block SCAN7 134 24 Acquisition channel 7 control block SCAN8 158 24 Acquisition channel 8 control block SCAN9 17C 24 Acquisition channel 9 control block SCAN10 1A0 24 Acquisition channel 10 control block SCAN11 1C4 24 Acquisition channel 11 control block SCAN12 1E8 24 Acquisition channel 12 control block SCAN13 20C 24 Acquisition channel 13 control block SCAN14 230 24 Acquisition channel 14 control block SCAN15 254 24 Acquisition channel 15 control block DIGI0 278 20 Digital I/O channel 0 control block DIDI1 298 24 Digital I/O channel 1 control block DIGI2 2B8 20 Digital I/O channel 2 control block DIGI3 2D8 20 Digital I/O channel 3 control block DIGI4 2F8 20 Digital I/O channel 4 control block DIGI5 318 20 Digital I/O channel 5 control block DIGI6 338 20 Digital I/O channel 6 control block DIGI7 358 20 Digital I/O channel 7 control block BTUS 378 A0 Reserved for BTU measurement control TSRX 418 2 Reserved for Time-Series-Record control FREQ 41A 2 Frequency Measurement control word TSCHED 41C 30 Reserved for TSR scheduling TSRMAP 44C 10 Reserved for TSR item selection TNAME0 45C C Totalizer name 0, 12 byte string TNAME1 468 C Totalizer name 1, 12 byte string TNAME2 474 C Totalizer name 2, 12 byte string TNAME3 480 C Totalizer name 3, 12 byte string TNAME4 48C C Totalizer name 4, 12 byte string TNAME5 498 C Totalizer name 5, 12 byte string TNAME6 4A4 C Totalizer name 6, 12 byte string TNAME7 4B0 C Totalizer name 7, 12 byte string TNAME8 4BC C Totalizer name 8, 12 byte string TNAME9 4C8 C Totalizer name 9, 12 byte string TNAME10 4D4 C Totalizer name 10, 12 byte string TNAME11 4E0 C Totalizer name 11, 12 byte string TNAME12 4EC C Totalizer name 12, 12 byte string TNAME13 4F8 C Totalizer name 13, 12 byte string TNAME14 404 C Totalizer name 14, 12 byte string TNAME15 410 C Totalizer name 15, 12 byte string SPARES 51C E2 Reserved CKSUM 5FE 2 16-bit checksum

6.2 DETAILS OF PARSET FIELDS 6.2.1 PSTYPE: PARAMETER SET TYPE This word describes the general type of the parameter set. Numeric values are...

0 1 2 3 4.

bad or uninstalled set Default parameter set User-custom (ROM-burned) parameter set Parameter set created by PARSET.EXE Other uploaded parameter set (e.g., from user program)

This is an active item in that the X180 microcode checks this value on powerup and, if it is not 1, 2, 3, or 4, force-loads the default parameter set (or a custom user set, if available). A custom set burned into ROM must be of type 2. 6.2.2 PSID: PARAMETER SET ID STRING This is an ASCII string which identifies the parameter set. This is a passive item and may be used in any manner. It is generally filled in by PARSET, using the user's entered text. 6.2.3 STAMP: PARAMETER SET TIME STAMP This is an ASCII string which identifies the date and time at which the parameter set was created or last modified. This is a passive field. 6.2.4 MODE: MODULE OPERATING MODE This data word contains several bits which set operating modes. Bits are...

BIT HEX VALUE FUNCTION WHEN SET 0 1 Selects timing for 50 Hz line frequency 1 2 Selects fast AC data filtering 4 10 Sets operation to high enian mode 5 20 Selects timing for 400 Hz line frequency

The frequency-select bits adjust sample timing for best results in both normal RMS measurement and waveform sampling modes. The default value is 60 Hz. The fast-filter bit causes the module to use a faster Gaussian filter to smooth RMS values, at the expense of reduced smoothing of AC line variations. The endian bit, when set, causes all 32-bit values (such as KWHs, KVAHs) to be assumed to be in most-significant-word-first format. 6.2.5 SCANn: ACQUISITION CHANNEL SCAN BLOCKS There are sixteen scan blocks, one for each of the 16 available electrical acquisition channels. Within each block, subfields are...

ITEM OFFSET LENGTH DESCRIPTION STUPE 0 2 Channel type; flags word TMUX 2 2 Voltage selector, totalizer word CTR 4 4 CT rotating in apms, floater, passive PTR 8 4 PT ratio, floater, passive SPARES C 4 Reserved, 2 words NAME 10 C Channel name in ASCII, 12 bytes, passive UNITS 1C 8 Engineering units text, 8 bytes, passive

The STYPE word declares the acquisition channel type and flag bits. The low four bits declare type. The hex value of the low four bits may be...

0 1 2 3 4 5

Unused channel AC current sensor, 250 mV RMS AC current sensor, 333.3 mV RMS +/- 5 volts DC analog input 1K platinum RTD temperature sensor linear resistance sensor analog input

The only defined flag bit is bit 12, hex value 1000h. If this bit is set, the AC power metering logic will assume that this channel is connected in a 3-wire, three-phase, Delta configuration. Only channels 0 through 7 can operate as RTD or resistance sensors. The TMUX word selects the AC line voltage wires associated with each "virtual wattmeter" channel, and the totalizer that receives the power level of each channel. If this word is treated as a 16-bit value having hex fields '0PHL', then...

P H L

is totalizer pointer, range 0...F hex is highside potential lead, range 0...7 is lowside potential lead, range 0...7

The 'P' value names a totalizer into which this acquisition channel sums its power and KVA measured values. Totalizers are named 0 through 15, corresponding directly to hex values of 'P'. Up to six acquisition channels may sum into any given totalizer. The 'H' and 'L' nibbles specify AC potential inputs which will be used to measure voltage and power for this channel. The mapping for both fields is...

H or L PT Lead 0 N1 1 A1 2 B1 3 C1 4 N2 5 A2 6 B2 7 C2

(standard potential transducer (PT) Leads)

(Optional second PT leads)

For example, acquisition channel 12, with TMUX value of 0530 hex, creates a virtual wattmeter which uses CT input 12 and potential C1 : N1. The measured power is summed into totalizer 5. The CTR and PTR fields are each 4-byte IEEE single-precision floating point values which express the channel current transducer rating (in amps) and potential transformer ratio respectively. Their default values are 100.0 and 1.000 respectively, and are changed by PARSET.EXE to express actual channel values. These are passive fields, used by B180.EXE and other programs to scale displayable data. If a channel is an analog input (types 3, 4, or 5), CTR and PTR are used as engineering unit scalers. Reported inputs (volts, degrees C, or ohms) may then be converted to other units by the relationship     Y = m * X + b where X is the unscaled channel analog data, m = CTR is a multiplier, and b = PTR is an adder. Again, these values are passive and are used by applications such as B180 to scale displayed/logged data. 6.2.6 DIGIn: DIGITAL CONTROL BLOCKS There are eight digital control blocks, one for each of the digital input/output points. Each block has the following internal structure:

ITEM OFFSET LENGTH DESCRIPTION DTYPE 0 2 Digital channel type and flags DPNTR 2 2 Pointer for pulse outputs DFACTR 4 4 Pulse factor, floater, passive SPARES 8 4 Reserve DNAME C 12 Point name, 12 byte ASCII, passive DUNITS 18 8 Engineering units, 8-byte ASCII, passive

The DTYPE word declares the digital function. The low hex digit is...

0 1 2 3 4 5

Unused digital channel Pulse counter input Runtime input Static digital output Pulse output TSR pulse output

Only one flag bit is defined in DTYPE. Bit 15 (8000h), when set, declares that runtime inputs are reversed, namely active when the corresponding digital input is open (normally, runtime is counted when the input contact is closed or the input is electrically low). If a digital point is declared to be a pulse output (DTYPE = 4), then the high byte of the DPNTR word acts as a pointer to "aim" at a source for output pulses. Values of this pointer are...

00...0F 10...1F 20...23

KWH (totalizers) 0...15 respectively KVAHs 0...15 respectively BTU registers 0...3 respectively

So if a digital control block had DTYPE = 0004h and DPNTR = 1F00h, the corresponding digital output would pulse ON (close to ground briefly) whenever totalizer number 15 accumulated 0.01 KVAH of normalized electrical KVAs. Note that since the electrical level of all digital points (even "unused" ones) may be read in real time, there is no need for a specific "static digital input" type. The DFACTR field is a 4-byte, single-precision IEEE floating point value which converts channel pulse counts into engineering units. If this channel were a pulse counter connected to a gas meter, DFACTR might then be the number 6.356, expressing the ratio of 6.356 cubic feet of gas per input pulse. This field is passive and is used by B180 and other programs to scale pulse counts. 6.2.7 BTUS: BTU MEASUREMENT CONTROL This field is reserved for BTU measurements. 6.2.8 TSRX: TSR CONTROL WORD Reserved for time-series-record (TSR) control. 6.2.9 FREQ: FREQUENCY SELECTOR This word is used to select the pair of AC potential transducer leads which are used to measure frequency. The word can be viewed as a 4- digit hex value 00XY, where the 4-bit fields X and Y select a pair of AC lines to which a virtual frequency meter is connected. The X and Y values are mapped as...

X or Y PT LEAD 0 N1 1 A1 2 B1 3 C1 4 N2 5 A2 6 B2 7 C2

So if the FREQ word is set to 0013 hex, for example, the V/AT180 will measure the frequency of the voltage between the A1 and C1 potential transducer wires. The codes 4...7 are useful only if a second, optional potential transducer is connected to the C760 termination panel. 6.2.10 TSCHED: TSR SCHEDULE This field is reserved for TSR scheduling. 6.2.11 TSRMAP: TSR MAP This field is reserved for selection of items to be included in time-series records. 6.2.12 TNAMES: TOTALIZER NAMES These sixteen string fields each assign an ASCII name to an energy totalizer. They are passive text fields. 6.2.13 CHECKSUM This word is a 16-bit checksum of the parameter set. It is computed by adding up all prievious parameter-set 16-bit words, using a 16-bit accumulator and ignoring overflows. The V/AT180 will not install a parameter set having a bad checksum. At powerup time, the checksum of the currently installed set is verified and, if found to be bad, the default parameter set (or custom set, if available) is force-installed.