PMDF System Manager's Guide

37.5.2 Configuring the Fujitsu dexNET 200

If you intend to use FAX receive, then take the steps outlined in Section 37.5.1 to ensure that the SYSGEN parameter MAXBUF exceeds 2048 bytes.

By default, the Fujitsu dexNET 200 FAX modem uses touch tone dialing to place phone calls. If the FAX modem is connected to a phone line which only supports pulse dialing, then be sure to specify PULSE=1 in the G3_TO_FAX channel option file.

The FAX modem may be connected to any terminal port (including terminal server ports) which is accessible to the system running PMDF-FAX. If possible, use a "straight" 25 wire RS232 cable. (Straight here means that pin N on the DTE end is wired to pin N on the DCE end, N = 1, 2, 3, ..., 25.) If you have fewer than 25 wires, then the important RS232 signals to wire are 2, 3, 6, 7, and 20 (TXD, RXD, DSR, GND, and DTR). If using a Compaq MMJ jack, then a Compaq MMJ to RS232 female connector (DEC part number H8571-F) or equivalent should be used.

Use of a 9600 or 19200 baud terminal port is mandatory: at critical times, communications to the FAX modem must occur at rates in excess of 4800 baud. As shipped, the modem is configured to operate at 9600 baud (8 data bits, 1 stop bit, no parity). The dexNET will transmit facsimiles at 7200 baud when driven at 9600 baud or at 9600 baud when driven at 19200 baud. Refer to Section 37.5.2.1 for directions on configuring the modem for 19200 baud operation. When using 19200 baud communications, be sure to use a terminal port rated for 19200 baud (e.g., VAXstation 3100 ports are not rated for 19200 baud and typically run a bit faster than 19200 baud).

When communicating with the modem, PMDF-FAX can be configured to use either in-band (XON/XOFF) or out-of-band (CTS/RTS) flow control. XON/XOFF flow control has been found to work best with DECserver 100, 200, and 500s and similar servers from other manufacturers. However, XON/XOFF flow control does not work well at all with DECserver 700 and 900s (they do not seem to respond fast enough to XOFF requests). For DECserver 700 and 900s, use CTS/RTS flow control. The selection of which flow control method to use is made with the FLOW_CONTROL option in the G3_TO_FAX and FAX_TO_DATA option files; see 37.2.17.4 and 37.3.6 for details on setting this option. And, of course, be sure to set the terminal server port appropriately.

Many of the terminal port characteristics have no effect on the operation of PMDF-FAX: all I/O operations are done via $QIO calls in PASTHRU mode (IO$M_NOFORMAT). Critical settings are made on a temporary basis (IO$_SETMODE) by the G3_TO_FAX channel when conversing with the FAX modem: TTSYNC on, TYPEAHEAD on. However, the terminal line should, at a minimum, be set as follows

$ SET TERMINAL/PERMANENT/ALTYPEAHD/NOTYPE_AHEAD/NOHANGUP/EIGHTBIT device-name

A suggested set of terminal characteristic settings are shown in Example 37-11.

Example 37-11 Suggested Terminal Port Settings for PMDF-FAX

Interactive Echo No Type_ahead No Escape Hostsync TTsync Lowercase No Tab Wrap Scope No Remote Eightbit No Broadcast No Readsync No Form Fulldup No Modem No Local_echo No Autobaud No Hangup No Brdcstmbx No DMA Altypeahd Set_speed Line Editing Insert editing No Fallback No Dialup No Secure server Disconnect No Pasthru No Syspassword No SIXEL Graphics No Soft Characters No Printer Port Application keypad ANSI_CRT No Regis No Block_mode Advanced_video No Edit_mode DEC_CRT DEC_CRT2 No DEC_CRT3 No DEC_CRT4

If the modem is connected to a terminal server, then the terminal server port should be set REMOTE, with the only enabled characteristics being Input Flow Control and Output Flow Control. When the LT device associated with the port is created, be sure to create it as a non-queued device with the /NOQUEUE qualifier. For convenience, a sample display of appropriate port settings are shown in Example 37-12.

Example 37-12 Suggested LAT Port Settings for PMDF-FAX

Port 1: Server: P148-MISC-3 Character Size: 8 Input Speed: 9600 Flow Control: XON Output Speed: 9600 Parity: None Modem Control: Disabled Access: Remote Local Switch: None Backwards Switch: None Name: P148-FAXBOX Break: Disabled Session Limit: 8 Forwards Switch: None Type: Ansi Preferred Service: None Authorized Groups: 0 (Current) Groups: 0 Enabled Characteristics: Input Flow Control, Output Flow Control

Finally, it is important that the FAX modem power up in either of the two FAX modes as indicated by the four mode LED's on the far right of the modem's front panel:

M O D E FAX C D * o o o [] ^ ^ | mode button This LED should be illuminated

Repeatedly press the mode button on the far right of the front panel until the left-most mode LED is illuminated. Then, power the modem off and then on. After the modem runs its tests, the left-most mode light should be on indicating that the modem is in FAX image mode.

37.5.2.1 Operating the dexNET 200 at 19200 baud

By default, the dexNET 200 communicates with the host computer at 9600 baud and transmits FAXes at 7200 baud. A 9600 baud FAX transmission speed may be achieved by using a speed of 19200 baud between the host computer and modem. However, it is crucial that the terminal line used actually be rated for 19200 baud: the dexNET 200 is not very tolerant of line speeds a bit faster or slower than 19200 baud. For example, many VAXstation and micro VAX terminal lines are not rated for 19200 baud and tend to run a bit fast. Follow these steps to configure the dexNET 200 to operate at 19200 baud:

Set the modem's terminal line speed to 9600 baud.
Repeatedly press the MODE button until the C mode LED is illuminated. The MODE button is located on the far right of the modem's front panel.

Connect to the modem using SET HOST/DTE and issue the command AT@D6@Z10&W if you are using XON/XOFF flow control, or AT@D6@Z5&W if you are using CTS/RTS flow control:

$ ALLOCATE TTA4: %DCL-I-ALLOC, _EXAMPLE$TTA4: allocated $ SET TERM/TYPE_AHEAD TTA4: $ SET HOST/DTE TTA4: %REM-I-TOQUIT, connection established Press Ctrl/\ to quit, Ctrl/@ for command mode AT@D6@Z10&W[RETURN] OK ^\ %REM-S-END, control returned to node EXAMPLE:: $ DEALLOCATE TTA4: $

Now repeatedly press the MODE button until the leftmost of the four mode LED's is illuminated. The HS LED (high speed LED) should also be illuminated.
Cycle the modem's power. Make sure that after powering up, the leftmost modem LED and the HS LED are both illuminated.
Set the modem's terminal line speed to 19200 baud.
You're ready to drive the modem at 19200 baud: no changes need to be made to the PMDF-FAX configuration.

Use the modem command AT@D5@Z9&W or AT@D5@Z4&W in place of, respectively, AT@D6@Z10&W or AT@D6@Z5&W should you wish to return to using 9600 baud between the host computer and FAX modem.

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