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MikeC/QandA/!Rs232stat/!Help

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

Tape/disk: Home » Recent acquisitions » Acorn ADFS disks » adfs_AcornUser_199610.adf » Features
Filename: MikeC/QandA/!Rs232stat/!Help
Read OK: ✔
File size: 17BF bytes
Load address: 0000
Exec address: 0000
File contents
!RS232Stat Version 1.00 - Released April 14, 1994
=======================

A program to monitor the serial port status.

It proved invaluable to me when I was first getting a modem going on
my Arc - maybe it will to you.


The display is derived from various OS_SerialOp and OS_Byte calls
and is updated ONLY on null events when the window is open. Any changes
you make to the various parameters will update the window on the next
null event. The display is never changed DIRECTLY as a result of a
mouse click. Hence when you see a change in status after you have clicked
on something, you can be sure it's the device driver which has acted upon
it.

The 'option' icons can be used to change the current settings. Click with
select to toggle the current setting.

The 'radio' buttons are read-only; they reflect the state of various signals
received by the computer from the modem.


Line Parameters
===============
The RX speed and the TX speed can, in theory, be set independantly to
different values. In practise however the hardware is only capable of
one pair of unequal TX and RX speeds - transmit at 75 baud and receive
at 1200 baud. The newer machines cannot even do that.
If you change the RX speed, both the RX and TX speeds are configured
using OS_SerialOp 5/6. If you change the TX speed, TX only is configured
using OS_SerialOp 6. Normally a change to either will result in the
driver changing both.
The Data Format display is derived from OS_SerialOp 1. The menu to configure
it is at present based on the much more restricted OS_Byte 156. In the future
I want to expand this to include all possible options allowed by OS_SerialOp 1.

Buffers
=======
The Input buffer count is the number of bytes received which have not yet
been read by a program.
The Output buffer count is the number of bytes for which there is room for
a program to write.
The Threshold value indicates the minimum number of bytes in the input buffer
before the driver takes action to stop the flow towards the computer (see
Hardware and Software Flow Control). This value can be changed by clicking
in the icon. Enter the new value and press Return. While the caret is in
this icon, the field will not be updated on null events.

Control
=======
DTR is the signal the computer uses to tell the modem that it is powered on
and ready for use. Some modems don't work if DTR is off; none that I know
of will auto-answer in this state. I always ensure DTR is off when I'm not
using the modem. This has the side-effect of giving the modem a good reset
when DTR is dropped (see modem command AT&D3).

DCD is the signal the modem uses to indicate to the computer that there is
a carrier, i.e. the data connection is established. The Arc can be told
to ignore DCD (the normal situation) or to respect it and disable the
serial port unless DCD is on. Modems can usually be configured to use
DCD normally (AT&C1) or to force DCD on (AT&C0).

DSR is the signal the modem uses to tell the computer that it is powered on
and ready for use, i.e. the reverse of DTR. The Arc can be told to ignore
DSR or to respect it and disable the serial port unless DSR is on. If DSR
is to be used and it is off, serial port output is still enabled but input
characters are ignored. Modems can often be configured to do different
things with DSR.

The RI (Ring Indicator) icon will pulse on and off when the modem recognizes
that the phone is ringing. Otherwise it will be Off.

Software Flow Control aka Xon/Xoff
==================================

This is mostly used for end-to-end flow control, so the Arc can tell the
host to stop or resume transmission and vice versa. Terminal connections
usually work this way, but it may cause problems during file transfers.
The host program will probably reconfigure its port to disable Xon/Xoff
during file transfers, but most Arc programs do not!
TX Unblocked means that the Arc thinks it is free to send, i.e. it has
not received an Xoff (DC3) since the last Xon (DC1).
RX Unblocked means that the Arc has told the other end to stop sending
by transmitting an Xoff.

Hardware Flow Control
=====================

This is normally used for the local connection between computer and modem.
It is necessary because of the interspeeder which modern modems use, so that
the speed with which the computer talks to the modem is not necessarily the
same speed at which the modem transmits and receives over the telephone line.
RTS is the signal with which the computer indicates to the modem whether it
has room in its buffer to receive more characters. Normally it is under the
control of the flow control business, but if you are only using software
flow control you may need to force RTS on to get the modem to cooperate.
CTS is the opposite; the modem uses CTS to tell the computer it can send.
The Arc can respect or ignore this signal.

Suggested settings to get going
===============================

If you can't seem to persuade your Arc to talk to your modem or vice versa,
try:
    Speed: as appropriate
    Data Format: 8N1
    'DTR State' On
    'Use DCD' Off
    'Use DSR' Off
    'Use CTS' Off

Once that works, the following should prove serviceable for most purposes:
    'Use DCD' Off
    'Use DSR' On
    H/W Flow Control Enabled
    'Force RTS On' Off
    'Use CTS' On
    Software Flow Control Enabled (disable during file transfers and when
        using SLIP!)
    
Futures
=======

*   add better configuration facilities for the Data Format.
*   add facility to save and restore settings, and to reset them to
    defaults

Contacting me
=============

If you have any comments to make about this program or this text, I can be
contacted via e-mail: colin@integrity.nl.
Alternatively:
    Colin Smale
    Spechtenkamp 87
    3607 KE   MAARSSEN
    Netherlands
    Tel: +31-3465-69038
    Fax: same number, phone first!

Legaleze
========

I hereby place this program in the public domain. Do what you want
with it, except sell it. Source code on request with a reasonable
reason for wanting it. Written in C (V3!) using risc_oslib. No guarantees
whatsoever.

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00000030  39 34 0a 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |94.=============|
00000040  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 0a 0a 41 20 70 72  |==========..A pr|
00000050  6f 67 72 61 6d 20 74 6f  20 6d 6f 6e 69 74 6f 72  |ogram to monitor|
00000060  20 74 68 65 20 73 65 72  69 61 6c 20 70 6f 72 74  | the serial port|
00000070  20 73 74 61 74 75 73 2e  0a 0a 49 74 20 70 72 6f  | status...It pro|
00000080  76 65 64 20 69 6e 76 61  6c 75 61 62 6c 65 20 74  |ved invaluable t|
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000001b0  6e 75 6c 6c 20 65 76 65  6e 74 2e 20 54 68 65 20  |null event. The |
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00000380  74 65 72 73 0a 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |ters.===========|
00000390  3d 3d 3d 3d 0a 54 68 65  20 52 58 20 73 70 65 65  |====.The RX spee|
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00000610  36 2e 20 49 6e 20 74 68  65 20 66 75 74 75 72 65  |6. In the future|
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000007f0  20 46 6c 6f 77 20 43 6f  6e 74 72 6f 6c 29 2e 20  | Flow Control). |
00000800  54 68 69 73 20 76 61 6c  75 65 20 63 61 6e 20 62  |This value can b|
00000810  65 20 63 68 61 6e 67 65  64 20 62 79 20 63 6c 69  |e changed by cli|
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00000840  20 76 61 6c 75 65 20 61  6e 64 20 70 72 65 73 73  | value and press|
00000850  20 52 65 74 75 72 6e 2e  20 57 68 69 6c 65 20 74  | Return. While t|
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00000870  68 69 73 20 69 63 6f 6e  2c 20 74 68 65 20 66 69  |his icon, the fi|
00000880  65 6c 64 20 77 69 6c 6c  20 6e 6f 74 20 62 65 20  |eld will not be |
00000890  75 70 64 61 74 65 64 20  6f 6e 20 6e 75 6c 6c 20  |updated on null |
000008a0  65 76 65 6e 74 73 2e 0a  0a 43 6f 6e 74 72 6f 6c  |events...Control|
000008b0  0a 3d 3d 3d 3d 3d 3d 3d  0a 44 54 52 20 69 73 20  |.=======.DTR is |
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00000960  65 72 20 69 6e 20 74 68  69 73 20 73 74 61 74 65  |er in this state|
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000009a0  74 68 65 20 6d 6f 64 65  6d 2e 20 54 68 69 73 20  |the modem. This |
000009b0  68 61 73 20 74 68 65 20  73 69 64 65 2d 65 66 66  |has the side-eff|
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000009e0  65 73 65 74 0a 77 68 65  6e 20 44 54 52 20 69 73  |eset.when DTR is|
000009f0  20 64 72 6f 70 70 65 64  20 28 73 65 65 20 6d 6f  | dropped (see mo|
00000a00  64 65 6d 20 63 6f 6d 6d  61 6e 64 20 41 54 26 44  |dem command AT&D|
00000a10  33 29 2e 0a 0a 44 43 44  20 69 73 20 74 68 65 20  |3)...DCD is the |
00000a20  73 69 67 6e 61 6c 20 74  68 65 20 6d 6f 64 65 6d  |signal the modem|
00000a30  20 75 73 65 73 20 74 6f  20 69 6e 64 69 63 61 74  | uses to indicat|
00000a40  65 20 74 6f 20 74 68 65  20 63 6f 6d 70 75 74 65  |e to the compute|
00000a50  72 20 74 68 61 74 20 74  68 65 72 65 20 69 73 0a  |r that there is.|
00000a60  61 20 63 61 72 72 69 65  72 2c 20 69 2e 65 2e 20  |a carrier, i.e. |
00000a70  74 68 65 20 64 61 74 61  20 63 6f 6e 6e 65 63 74  |the data connect|
00000a80  69 6f 6e 20 69 73 20 65  73 74 61 62 6c 69 73 68  |ion is establish|
00000a90  65 64 2e 20 54 68 65 20  41 72 63 20 63 61 6e 20  |ed. The Arc can |
00000aa0  62 65 20 74 6f 6c 64 0a  74 6f 20 69 67 6e 6f 72  |be told.to ignor|
00000ab0  65 20 44 43 44 20 28 74  68 65 20 6e 6f 72 6d 61  |e DCD (the norma|
00000ac0  6c 20 73 69 74 75 61 74  69 6f 6e 29 20 6f 72 20  |l situation) or |
00000ad0  74 6f 20 72 65 73 70 65  63 74 20 69 74 20 61 6e  |to respect it an|
00000ae0  64 20 64 69 73 61 62 6c  65 20 74 68 65 0a 73 65  |d disable the.se|
00000af0  72 69 61 6c 20 70 6f 72  74 20 75 6e 6c 65 73 73  |rial port unless|
00000b00  20 44 43 44 20 69 73 20  6f 6e 2e 20 4d 6f 64 65  | DCD is on. Mode|
00000b10  6d 73 20 63 61 6e 20 75  73 75 61 6c 6c 79 20 62  |ms can usually b|
00000b20  65 20 63 6f 6e 66 69 67  75 72 65 64 20 74 6f 20  |e configured to |
00000b30  75 73 65 0a 44 43 44 20  6e 6f 72 6d 61 6c 6c 79  |use.DCD normally|
00000b40  20 28 41 54 26 43 31 29  20 6f 72 20 74 6f 20 66  | (AT&C1) or to f|
00000b50  6f 72 63 65 20 44 43 44  20 6f 6e 20 28 41 54 26  |orce DCD on (AT&|
00000b60  43 30 29 2e 0a 0a 44 53  52 20 69 73 20 74 68 65  |C0)...DSR is the|
00000b70  20 73 69 67 6e 61 6c 20  74 68 65 20 6d 6f 64 65  | signal the mode|
00000b80  6d 20 75 73 65 73 20 74  6f 20 74 65 6c 6c 20 74  |m uses to tell t|
00000b90  68 65 20 63 6f 6d 70 75  74 65 72 20 74 68 61 74  |he computer that|
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00000d80  6f 6c 20 61 6b 61 20 58  6f 6e 2f 58 6f 66 66 0a  |ol aka Xon/Xoff.|
00000d90  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |================|
*
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00000fe0  20 58 6f 66 66 2e 0a 0a  48 61 72 64 77 61 72 65  | Xoff...Hardware|
00000ff0  20 46 6c 6f 77 20 43 6f  6e 74 72 6f 6c 0a 3d 3d  | Flow Control.==|
00001000  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |================|
00001010  3d 3d 3d 0a 0a 54 68 69  73 20 69 73 20 6e 6f 72  |===..This is nor|
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00001310  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |================|
00001320  3d 3d 3d 3d 3d 3d 0a 0a  49 66 20 79 6f 75 20 63  |======..If you c|
00001330  61 6e 27 74 20 73 65 65  6d 20 74 6f 20 70 65 72  |an't seem to per|
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000013b0  20 53 74 61 74 65 27 20  4f 6e 0a 20 20 20 20 27  | State' On.    '|
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000013d0  20 27 55 73 65 20 44 53  52 27 20 4f 66 66 0a 20  | 'Use DSR' Off. |
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000013f0  0a 0a 4f 6e 63 65 20 74  68 61 74 20 77 6f 72 6b  |..Once that work|
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00001440  20 27 55 73 65 20 44 43  44 27 20 4f 66 66 0a 20  | 'Use DCD' Off. |
00001450  20 20 20 27 55 73 65 20  44 53 52 27 20 4f 6e 0a  |   'Use DSR' On.|
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00001470  74 72 6f 6c 20 45 6e 61  62 6c 65 64 0a 20 20 20  |trol Enabled.   |
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00001490  4f 66 66 0a 20 20 20 20  27 55 73 65 20 43 54 53  |Off.    'Use CTS|
000014a0  27 20 4f 6e 0a 20 20 20  20 53 6f 66 74 77 61 72  |' On.    Softwar|
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00001500  50 21 29 0a 20 20 20 20  0a 46 75 74 75 72 65 73  |P!).    .Futures|
00001510  0a 3d 3d 3d 3d 3d 3d 3d  0a 0a 2a 20 20 20 61 64  |.=======..*   ad|
00001520  64 20 62 65 74 74 65 72  20 63 6f 6e 66 69 67 75  |d better configu|
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00001550  6f 72 6d 61 74 2e 0a 2a  20 20 20 61 64 64 20 66  |ormat..*   add f|
00001560  61 63 69 6c 69 74 79 20  74 6f 20 73 61 76 65 20  |acility to save |
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000015b0  69 6e 67 20 6d 65 0a 3d  3d 3d 3d 3d 3d 3d 3d 3d  |ing me.=========|
000015c0  3d 3d 3d 3d 0a 0a 49 66  20 79 6f 75 20 68 61 76  |====..If you hav|
000015d0  65 20 61 6e 79 20 63 6f  6d 6d 65 6e 74 73 20 74  |e any comments t|
000015e0  6f 20 6d 61 6b 65 20 61  62 6f 75 74 20 74 68 69  |o make about thi|
000015f0  73 20 70 72 6f 67 72 61  6d 20 6f 72 20 74 68 69  |s program or thi|
00001600  73 20 74 65 78 74 2c 20  49 20 63 61 6e 20 62 65  |s text, I can be|
00001610  0a 63 6f 6e 74 61 63 74  65 64 20 76 69 61 20 65  |.contacted via e|
00001620  2d 6d 61 69 6c 3a 20 63  6f 6c 69 6e 40 69 6e 74  |-mail: colin@int|
00001630  65 67 72 69 74 79 2e 6e  6c 2e 0a 41 6c 74 65 72  |egrity.nl..Alter|
00001640  6e 61 74 69 76 65 6c 79  3a 0a 20 20 20 20 43 6f  |natively:.    Co|
00001650  6c 69 6e 20 53 6d 61 6c  65 0a 20 20 20 20 53 70  |lin Smale.    Sp|
00001660  65 63 68 74 65 6e 6b 61  6d 70 20 38 37 0a 20 20  |echtenkamp 87.  |
00001670  20 20 33 36 30 37 20 4b  45 20 20 20 4d 41 41 52  |  3607 KE   MAAR|
00001680  53 53 45 4e 0a 20 20 20  20 4e 65 74 68 65 72 6c  |SSEN.    Netherl|
00001690  61 6e 64 73 0a 20 20 20  20 54 65 6c 3a 20 2b 33  |ands.    Tel: +3|
000016a0  31 2d 33 34 36 35 2d 36  39 30 33 38 0a 20 20 20  |1-3465-69038.   |
000016b0  20 46 61 78 3a 20 73 61  6d 65 20 6e 75 6d 62 65  | Fax: same numbe|
000016c0  72 2c 20 70 68 6f 6e 65  20 66 69 72 73 74 21 0a  |r, phone first!.|
000016d0  0a 4c 65 67 61 6c 65 7a  65 0a 3d 3d 3d 3d 3d 3d  |.Legaleze.======|
000016e0  3d 3d 0a 0a 49 20 68 65  72 65 62 79 20 70 6c 61  |==..I hereby pla|
000016f0  63 65 20 74 68 69 73 20  70 72 6f 67 72 61 6d 20  |ce this program |
00001700  69 6e 20 74 68 65 20 70  75 62 6c 69 63 20 64 6f  |in the public do|
00001710  6d 61 69 6e 2e 20 44 6f  20 77 68 61 74 20 79 6f  |main. Do what yo|
00001720  75 20 77 61 6e 74 0a 77  69 74 68 20 69 74 2c 20  |u want.with it, |
00001730  65 78 63 65 70 74 20 73  65 6c 6c 20 69 74 2e 20  |except sell it. |
00001740  53 6f 75 72 63 65 20 63  6f 64 65 20 6f 6e 20 72  |Source code on r|
00001750  65 71 75 65 73 74 20 77  69 74 68 20 61 20 72 65  |equest with a re|
00001760  61 73 6f 6e 61 62 6c 65  0a 72 65 61 73 6f 6e 20  |asonable.reason |
00001770  66 6f 72 20 77 61 6e 74  69 6e 67 20 69 74 2e 20  |for wanting it. |
00001780  57 72 69 74 74 65 6e 20  69 6e 20 43 20 28 56 33  |Written in C (V3|
00001790  21 29 20 75 73 69 6e 67  20 72 69 73 63 5f 6f 73  |!) using risc_os|
000017a0  6c 69 62 2e 20 4e 6f 20  67 75 61 72 61 6e 74 65  |lib. No guarante|
000017b0  65 73 0a 77 68 61 74 73  6f 65 76 65 72 2e 0a     |es.whatsoever..|
000017bf

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