15
4. Check the Converter’s DTE/DCE slide switch and the word-
structure and flow-control settings of its DIP switch. If they are correctly set
for communication with your serial device, go to Step 5.
5. A cable run may be too long. Cable length for parallel communica-
tion must not exceed 20 feet (6.1 m) between any pair of devices; serial
cable length must not exceed 50 feet (15.2 m) for UTP or 500 feet (152.4 m)
for extended distance data cable. If either of your devices is too far from
the S
↔
P Converter, move the Converter or move the device.
6. If the problem isn’t solved, run the Converter’s self-test by setting
its DIP switch position 6 to ON. If the self-test data is not transmitted
properly to the output device, you can concentrate on the ouput device and
cable as you search for the cause of the problem. If the data is transmitted
properly, you can concentrate on the input device, its software, and the
input cable. go to Step 7.
7. A cable might be broken. Visually inspect the length of your cables
or continuity-test them. You can also try replacing the cable with identical
cable you know is OK.
8. If the problem isn’t solved, a cable or an adapter may be pinned
incorrectly. Any parallel cable connecting the parallel ports of your
Converter and a PC (RS-232 extension cable), as well as any UTP or EDDC
serial cable, should be pinned straight-through. This means that a single
wire connects Pin 1 at one end to Pin 1 at the other end. Likewise Pin 2 is
wired to Pin 2, 3 to 3, and so on. Also, the RS-232 extension cable must not
have Pin 1 tied to the shield.
If you’re using an adapter compatible with one of those shown in
Figures 3-1 and 3-2, compare the pinning in the charts in Figure 3-1 or 3-2
and in the Appendix with the pinning listed in your adapter’s
documentation (do
not
disassemble the adapter). If you’re unable to
determine the pinning of your adapter, or if you’re using an adapter with a
different type of connector, call us.
9. If the problem isn’t solved, check the hardware and software
configurations of the attached devices. If possible, test both of your devices
by detaching them from the S
↔
P Converter and connecting them to
different equipment (serial device to serial device, parallel device to parallel
device). Attempt communication through the same serial or parallel port
you were using when the problem occurred. If possible, use the same serial
CHAPTER 5: Troubleshooting
Summary of Contents for PI035A
Page 26: ...NOTES...
