EM1500 User’s Manual
69
The manual controls are:
•
M/C
: this forces the EM1500 into or out of Hayes modem emulation mode. You should not do this
if a connection is currently open, since it may confuse the device attached to the serial port.
•
Poll
: pressing this button initiates a polling sequence.
•
Conn
: pressing this forces a network connection to be opened (if not already open) or closed (if cur-
rently open). If opening a connection, the default destination parameters from the 'Opening' tab of
the serial port are used. If closing a connection, then the connection is aborted ungraciously. The
peer that is currently connected will receive a TCP reset command that will cause it to abort its con-
nection. Depending on configuration, either or both peers may try to initiate a new connection auto-
matically.
These controls are mainly useful while testing and debugging a configuration. It is often useful to be able
to manually cancel a connection, since sometimes one of the peers can get confused (or crash)—in this
case, the connection sometimes gets “stuck” which requires a manual reset.
The text display on the 3rd and final line shows the current serial port setup (including speed, data bits,
parity, flow control and overall connection state). The first and second fields show speed and “geometry”
of the port. The third field is two letters separated by “/” which show the current transmit and receive flow
control:
The fourth field is a word which describes the connection state to the network:
Table 5.4 Transmit and receive flow control status
Symbol
Meaning
N
N
o flow control
C/R
C
TS/
R
TS hardware flow control
S/T
D
S
R/D
T
R
D
D
CD
X
X
ON/
X
OFF software flow control
Table 5.5 Connection state to the network
State
Meaning
Init
Initializing
wDNS
Waiting to start domain name resolution
DNS
Waiting for domain name resolution
Setup
Starting to open TCP connection
Opening
Waiting to open TCP connection
Ready
Listening for incoming TCP connection
IP address
Dotted decimal IP address of peer when successfully connected. This
is also followed by the TCP port number on the peer.
wClose
Starting to close connection
Closing
Waiting to close connection
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...