User`s manual

CHAPTER 2
MODES OF OPERATION
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 SETMODE (on/off) and SETTRANS (on/off)
commands must be enabled (SETMODE = ON and
SETTRANS = ON) and switch Bit 8 to ON (RS-232C
Setup Switch). The SETMOD command will defeat the
SENDPAC and COMMAND variables and will put the
ESTeem in the transparent mode when Bit 8 is ON.
The SETTRANS command when enabled will program
the following discrete commands:
AUTOLF = OFF ECHO = OFF EDIT = OFF
PROMPT = OFF TYPS = OFF
PLEASE NOTE: When SETTRANS is enabled the
screen will go blank because ECHO has been disabled,
therefore this should be the last variable programmed
before the SAVE command.
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) or the Request to Send/Clear to
Send lines (RTS_CTS = ON) and disabling software flow
control (XSF = OFF) in the ESTeem.
The SETCON (Set Connect) or ALTERO (Alternate
Route) commands must be used to define the node that
you want to communicate with because while in the
TRANSPARENT Mode 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 8, Off on the RS-232C Setup Switch.
2. Reset the ESTeem from the front panel switch.
3. Type FA <cr>. The characters FA will not be
echoed on your CRT because the ECHO command in
the ESTeem is disabled.
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.
Pin 6 on the ESTeem RS-232C connector provides a
feedback status to the user when MODECON is set to
HARDWARE. A "high or 1" condition on pin 6
indicates the ESTeem modem is in the COMMAND
mode. A "low or 0" condition on pin 6 indicates the
ESTeem modem is in the CONVERSE or
TRANSPARENT mode.
CONDITIONAL TRANSPARENT MODE
This mode is a special version of the TRANSPARENT
Mode. This mode is entered by typing the following from
the COMMAND Mode:
TRANS X <cr>
The "X" specifies the number of packets to be sent before
returning to the COMMAND Mode. If the argument is
set to zero or not entered, then the original form of the
Transparent Mode will be executed. When using this
command the ">" prompt will be displayed on your CRT.
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.