Precision Digital PD554 - Manual (Page 10)

Digital Inputs
CONFIGURATION Two contacts, two operating modes
CONTACTS Normally open switches (external excitation not required)
or open collector transistor
OPEN CIRCUIT Approximately 5 VDC
VOLTAGE
LOGIC LEVELS LO = 0 to 0.8 VDC, HI = 4.7 to 28 VDC
OPERATION Mode 1: Program hold and step
Mode 2: Program run or reset
Digital Outputs
CONFIGURATION 2 or 4 open collector transistor
OPERATION MODES Alarms, inner signal PV or SP zones, program segment time
signals, SP status (ramp up/down or soak), program run or
end alerts
TRANSISTOR RATING 24 VDC @ 50 mA
Serial Communications
PROTOCOLS Modbus (ASCII, RTU), PC software,
SYNC (master SP control)
UNIT ADDRESS 1 to 99 (Max 31 units connected)
BAUD RATE 600, 1200, 2400, 4800, 9600, 19200 bps, user selectable
RESPONSE TIME 0 to 100 ms delay response time
10 ms increments user selectable
DATA 7 or 8 bit user selectable
PARITY None, even, or odd
Approvals
UL RECOGNIZED USA and Canada
Process Control Equipment
UL FILE NUMBER E244207
CE COMPLIANT
PD550 Series Nova Programmable Process and Temperature Controller Instruction Manual
10