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110
EM1500 FAQ
Q:
How do I set 2 stop bits?
A:
You cannot have arbitrary settings with 2 stop bits. The hardware only supports a single stop
bit. You can simulate 2 stop bits by setting "mark" parity, however you can obviously not use
normal even or odd parity. Mark parity is equivalent to no parity, with 2 stop bits.
Q:
I have an old device that receives at 1200 bps, but sends at only 75 bps. How do I set up the
EM1500 for this device?
A:
The serial ports really only support the same speed for receive and transmit. The only solution
is to use two serial ports, one for transmit and the other for receive. This requires two telnet
connections, so it is not compatible with PC COM port redirectors You need custom software
to set up the telnet connections.
Q:
Can I monitor the data that is sent/received by a serial port?
A:
Not directly; however, there are several ways of doing this:
• Use an Ethernet sniffer program such as Ethereal. You can clearly see the data sent over a
telnet connection with this program.
• Intercept the telnet data directly by writing a custom TCP/IP program. This program could
act as a "man in the middle", forwarding data to the real application, but also saving it off
in a file for later analysis.
Q:
I want the EM1500 to send a prompt to the device on a regular basis, but without expecting
any particular response.
A:
In the Polling tab, check "Enable poll" then set the poll script to be a single string (without
any spaces). This string will be sent at “Poll interval” milliseconds. Make sure that “Poll
timeout” is set to a non-zero value, otherwise the string is never sent. If you need spaces in
the string, surround the string with single quotes.
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...