Dwyer UXF3 - Manual (Page 7)

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2. SPECIFICATIONS
2.1 Communication Specifications
Item Specification
Electrical specification Based on EIA RS-485 or based on EIA RS-232C
Transmission system 2-wire, semi-duplicate
Synchronizing system Start-stop synchronous system
Connection format 1 : N (RS-485), 1:1 (RS-232C)
Number connectable units Up to 31 units (RS-485), 1 unit (RS-232C)
Transmission distance (total
extension)
1,000 m max. (RS-485), 15 m max. (RS-232C)
Transmission speed 9600, 19200, 38400 bps
Data format Data length 8 bits
Stop bit 1 bit
Parity none, even, odd (selectable)
Isolation
Functional isolation between transmission circuit
and ground (withstand voltage : 500V AC)
2.1.1 Communication protocol
(1) MODBUS protocol
Item Specification
Transmission code HEX value (MODBUS RTU mode)
Error detection CRC-16
(2)
Item Specification
Transmission code ASCII
Error detection LRC (Logical redundancy check)
Bulletin F-107-UXF3-S
Alternate protocol (proprietary)