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7300A User Manual
1-9
Identification
1.2.13. DIGITAL COMMUNICATION
Protocol
Modbus® RTU
Compliance
Communication complies with the specifications given in
‘GOULD MODICON Protocol Reference Guide PI-MBUS-300 rev J’
Power supply
24 Vac (±20%), 47 to 63 Hz to
24 Vdc (±20%) non-polarised (filtered).
Typical consumption 1.5 VA.
Protection : External fuse 1 A.
External wiring must comply with the IEC 60364 standard.
Transmission
Standard RS485 2 wires.
Speed 9600 to 19200 bauds.
Selection by the front panel microswitch (SW8).
Terminaison
The communication bus must have termination resistors
fitted at each end:
•One line impedance matching resistor.
• two RS485 bus polarisation resistors.
Address
Selection by switches on front panel only, between 1 to 127.
Physical address 32 is configured by default.
Diagnostics
• Green LED an front panel indicates that power is applied
and the unit is awaiting communications.
• Two orange LEDs (Rx and Tx) indicate the communication
satus (sending and receiving)
Other parameters
Read and Write by digital communication.
Содержание 7000 Series
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Страница 65: ...Digital Communication 7300A User Manual 6 12 ...