4
Introduction
1.2.2 Software Highlights
•
Serial-to-Ethernet protocol converter
• on all serial ports
• 75 to 230400 bps
• none, even, odd, mark, space parity
• 7 or 8 data bits
• 1 stop bit only, or 2 stop bits may be emulated using “mark” parity.
•
Flow control:
• None
• XON/XOFF
• Hardware: CTS/RTS, DTR/DSR if these signals available to the port.
•
RS232/485 serial protocols:
• standard asynchronous
• async with timing-based packetization
• async with CRLF (or other fixed string) packetization
• 9th bit low protocol for start-of-frame
• Automatic polling of serial device is possible
• All serial ports may emulate AT (Hayes-compatible) command set.
•
RS485 transmit enable discipline:
• transmit whenever data present
• transmit only after idle time
•
Internet protocols:
• "raw" data stream over TCP
protocol:
EM1500 acts as "modem server" or "serial port server"
Works with popular PC
• R Rabbit extensions for packetized data and for two EM1500s communicating with
each other. Extensions are transparently negotiated.
• EM1500 can be 'server' and/or 'client' (server only for RFC2217 protocol)
• Connections can be actively opened (client mode) based on modem line conditions, on
received characters, on ATD type commands, or unconditionally.
• Connections can be passively opened (server mode) based on modem line conditions, on ATA
type commands, or unconditionally.
• Connections may be closed based on modem line conditions, +++ATH type commands, net-
work timeouts or automatic serial device polling timeouts.
Summary of Contents for EM1500
Page 14: ...10 www rabbit com Introduction...
Page 22: ...18 www rabbit com Getting Started...
Page 76: ...72 www rabbit com EM1500 Configuration...
Page 90: ...86 www rabbit com EM1500 Specifications...
Page 104: ...100 www rabbit com Serial and TCP Protocols...
Page 118: ...114 www rabbit com EM1500 FAQ...