User's Manual

CHAPTER 2
MODES OF OPERATION
Revised: 27 March 01
2-3
TRANSPARENT MODE
The TRANSPARENT Mode allows the ESTeem to pass
all data characters (O-255 or 0-FF hex) using 8 data bits.
To program the ESTeem in the TRANSPARENT mode
the TRANSPARent command must be enabled and
switch Bit 2 to ON (RS-232C Setup Switch). The
TRANSPARent command will defeat the SENDPAC and
COMMAND variables and put the ESTeem in the
transparent mode when Bit 2 is ON.
The transmission of the data packets can only be
accomplished by enabling the termination control
commands (TERMC and TERMT) or the PACKLEN
buffer being filled. The value of TERMT should be
slightly longer than the maximum delay encountered
during RS-232C transmission. If this time is set to short,
the ESTeem will truncate your data stream improperly.
When using the TRANSPARENT Mode, data flow
control is by hardware handshaking only. Hardware
handshaking is initiated by enabling hardware flow
control (XHF = ON).
The SETCON (Set Connect command) must be used to
define the node that you want to communicate with while
in the TRANSPARENT Mode. When the
TRANSPARENT Mode is enabled you can not
communicate to the ESTeem in the COMMAND Mode
unless you use the Hardware Mode Control line (see
explanation this chapter).
To remove the ESTeem from the TRANSPARENT Mode
the user must perform the following:
1. Switch Bit 2, Off on the RS-232C Setup Switch.
2. Reset the ESTeem from the front panel switch.
3. Type TRANS OFF <Enter>.
SEMI-TRANSPARENT MODE
This mode should be utilized when sending a non-ASCII
file and there is a possibility that the SENDPAC
character could be contained in the transmitted data set.
Perform the following prior to programming the ESTeem
to initialize the unit to factory default settings:
1. Turn Bit 2, OFF on the RS-232C Setup Switch.
2. Reset the ESTeem.
3. TYPE FA <Enter>. Please note the characters may
or may not be echoed by the CRT.
ESTeem
-------------------------
ADD xxx xxx = your address
SETC yyy yyy = destination address
TERMC ON
TERMT 10
SENDP 255
EDIT OFF
XSF ON
SAVE
If EDIT is off, and SENDPAC = 255, the SENDPAC
character is disabled. This character when received will
not cause packet transmission and will be passed as
normal data. The TERMC and TERMT commands are
used to transmit the contents of the ESTeem transmit
buffer.
Software flow control in this example is enabled (factory
default XSF = OFF) therefore the ESTeem will pass all
characters except the data flow control characters for
Xon/Xoff.
HARDWARE MODE CONTROL
The MODECON (Mode Control) command is provided
in the ESTeem to change the mode of the ESTeem
modem from COMMAND Mode to CONVERSE (or
TRANSPARENT Mode) via a hardware control line.
The hardware line is located on pin 19 of the RS-232C
connector. If MODEC = HARDWARE, a "low or 0" on
pin 19 (-3 to -15 vdc) will put the ESTeem in the
COMMAND Mode and a "high or one" on pin 19 ( +3 to
+15 vdc) will put the ESTeem in the CONVERSE or
TRANSPARENT Mode. The factory default is
SOFTWARE.