Do you have a usb to ttl converter? If  so you could use a terminal program and 
do a loop-back test (connect RX to TX)




>________________________________
> From: Viesturs Lācis <viesturs.la...@gmail.com>
>To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> 
>Sent: Thursday, March 22, 2012 9:04 AM
>Subject: Re: [Emc-users] Smart-serial and 7i43
> 
>2012/3/18 Peter C. Wallace <p...@mesanet.com>:
>> On Sun, 18 Mar 2012, Viesturs L?cis wrote:
>>
>>> Date: Sun, 18 Mar 2012 07:21:38 -0400
>>> From: "[UTF-8] Viesturs L?cis" <viesturs.la...@gmail.com>
>>> Reply-To: "Enhanced Machine Controller (EMC)"
>>>     <emc-users@lists.sourceforge.net>
>>> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
>>> Subject: Re: [Emc-users] Smart-serial and 7i43
>>>
>>> 2012/3/17 Peter C. Wallace <p...@mesanet.com>:
>>>> Heres tha latest I have(any SSERIAL with 5 registers has to be at least 6
>>>> months old)
>>>
>>> So I got LinuxCNC to start up without errors. I have connected 8i20
>>> drive to 7i43 card.
>>>
>>> 1) But I do not see it in "Show HAL config" (I expect it to appear
>>> there, if sserial module finds it):
>>> http://www.linuxcnc.org/docs/devel/html/man/man9/hostmot2.9.html#8i20
>>>
>>> Based on that I understand that communication between sserial and 8i20
>>> is not happening.
>>>
>>> I should mention that between 8i20 and 7i43 is my diy ttl <--> rs422
>>> converter (I am aware of existence of 7i44 card, but since I only want
>>> to test, how 8i20 would perform with my servo motors, I thought that
>>> building such a convertor would be cheaper). That converter is based
>>> on SN75179 chip (very first scheme here):
>>> http://www.datasheetarchive.com/dl/Datasheets-37/DSA-720721.pdf
>>>
>>> Based on firmware's PIN file, there are following sserial pins on P3 
>>> connector:
>>>    21      34     IOPort       SSerial       0        RXData1         (In)
>>>
>>>    23      35     IOPort       SSerial       0        RXData2         (In)
>>>
>>>    25      36     IOPort       SSerial       0        TXData1         (Out)
>>>
>>>    27      37     IOPort       SSerial       0        TXEn1           (Out)
>>>
>>>    29      38     IOPort       SSerial       0        TXData2         (Out)
>>>
>>>    31      39     IOPort       SSerial       0        TXEn2           (Out)
>>>
>>>
>>> I have connected RXData1 and TXData1 to my converter, all the
>>> remaining pins are not connected anywhere.
>>>
>>> Is this correct?
>>> How can I test the communication between 7i43 and 8i29 cards, to see,
>>> if that convertor is actually working?
>>>
>>> On 8i20 card 4 LEDs are shining:
>>> Pwr
>>> Lv status
>>> Iso pwr
>>> Fault
>>>
>>
>> SSERIAL will not start a 8I20 unless the 8I20 has its drive enable powered 
>> and
>>>~45V motor power. (newer 8I20 firmware does allow starts under these
>> conditions)
>
>I have 55 VDC on motor power inputs and 12 VDC on enable inputs, but
>still all the same.
>What else am I missing?
>Can anyone suggest, how can I test, if my diy ttl <--> rs422 converter
>is working correctly?
>
>Viesturs
>
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