Precision Digital PD6730X - Manual (Page 10)

PD6730X Vantageview Super Snooper Modbus Scanner Instruction Manual
10
Serial Communications
PROTOCOL 3-Wire RS-485 Modbus® RTU
SCANNER ID 1 – 247. Specifies the address of the PD6730X.
BAUD RATE 1,200; 4,800; 9,600; 19,200; 38,400; 57,600; or 115,200 bps
TRANSMIT TIME
DELAY Programmable between 0 and 199 ms
PARITY/STOP BIT Even, odd, none with 1 stop bit, or none with 2 stop bits
BYTE-TO-BYTE
TIMEOUT Max of 1.5 character times or 750 μs
Modbus Scanner Process Variables
PV INPUTS Up to 16 independently programmed Modbus process variables (PVs) may be
scanned (Master mode) or detected (Snooper mode). Each of the 16 Modbus
PVs may be enabled or disabled.
SLAVE ID Specifies which device on the bus to monitor. Valid for Master and Snooper
modes only.
Assign the slave ID or address (1-247) of each of the devices containing the
process variables to be displayed (Slave ID for PV1-16).
REGISTER NUMBER Specifies which register(s) to read in the devices on the bus.
5 Digit Function 03: 40001–49999; 04: 30001–39999; or 65: 1–9999.
6 Digit Function 03: 400001–465535 or 04: 300001–365535; or 65: 1–65535.
Range is dependent on Function Code selection (03, 04, or 65)
Will read 2 registers for Long integer and Floating point data types; the register
entered and the next consecutive register number.
Valid for Master and Snooper modes only.
FUNCTION CODE 03, 04, and 65 (used to read 32 bit registers). Master & Snooper modes only.
DATA TYPE Select the data format of the PVs. Select between short integer (2 byte), long
integer (4 byte), or floating point (4 byte). Slave mode uses floating point only.
BYTE
ORDER Integer data programmable as binary or BCD, and signed or unsigned. Byte
order selectable as big-endian (1234), little-endian (4321), byte swap big-endian
(2143), or byte swap little-endian (3412). Byte swap unavailable for short.
Math Channels
MATH RESULT
CHANELS Four math channels CV1-CV4. Each math channel may be programmed for a
math function.
MATH FUNCTIONS Parameter 1 (PAR1), parameter 2 (PAR2), and parameter 3 (PAR3) independently programmable for
each math channel C1-C4.
Math Function Function Setting
Addition PAR1 + PAR2 SUM
Difference PAR1 - PAR2 DIF
Multiplication PAR1 * PAR2 MULTI
Division PAR1 / PAR2 DIVIDE
Absolute diff. Abs(PAR1 - PAR2) DIFABS
Weighted avg. ((PAR1 – PAR2)*PAR3) +PAR2 WAVG
Draw ((PAR1 / PAR2) – 1) * PAR3 DRAW
Ratio (PAR1 / PAR2) * PAR3 RATIO
Concentration PAR1 / (PAR1 + PAR2) * PAR3 CONCEN
Contant Constant CONST
Long Integer Constant LONG
Floating Pt. Constant FLOAT
None Disable NONE
Absolute Value Abs(PAR1) ABS
Square Root √(PAR1) SQrt