Black Box SERVSWITCH ACU1006DRA, Руководство пользователя

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95
8.1.4 S
ERIAL
D
EVICE
(KVM/S
ERIAL AND
KVM/S
ERIAL
/A
UDIO
E
XTENDERS
O
NLY
)
A CPU doesn’t detect the serial device I’m trying to use with it.
You’ll approach this problem differently on KVM/Serial links and KVM/Serial/
Audio links. On KVM/Serial links, take these steps:
1. Make sure that the data rates of the device, the Extender, and the CPU’s
serial port all match. (See Section 5.4 for how to set the Extender’s data rate.)
2. Make sure that the flow-control settings of the Extender and of your driver or
serial-communication program are correct—see Section 5.5 . If you’re using a
serial printer or touchscreen, try setting the Extender to loop back RTS/CTS.
(If you still have trouble with the touchscreen, set it to loop back both
RTS/CTS and DTR/DSR.) If you’re using some other kind of serial device,
try setting everything to “no flow control.”
On KVM/Serial/Audio links, take these steps:
1. Make sure that the data rates of the device and the CPU’s serial port both
match, and that the data rate doesn’t exceed 19,200 bps.
2. Make sure that the device and your PC’s driver or serial-communication
program are using the same type of flow control.
A CPU doesn’t seem to receive anything from its serial device or vice versa.
1. If possible, attach the serial device directly to the CPU. If it works, skip to #2.
If it doesn’t, is the device actually standard RS-232? Is it a device the CPU
supports? Is a driver for the device loaded, or is software running, that enables
the CPU to recognize input from the device?
2. Check the serial cables. Are they intact along their length and securely
connected at both ends?
From this point on, you’ll approach this problem differently on KVM/Serial links
and KVM/Serial/Audio links. On KVM/Serial links, take these steps:
3. Check the data rate. Is the device operating at either 9600 or 19,200 bps? Is
the Extender set to the same data rate (see
Section 5.4
)?
4. Check the data format. Is the device using 8 data bits, no parity, and 1 stop
bit? (This is the only data format the Extender recognizes.)
5. Check the flow control. Is the device using flow-control signals that the
Extender can handle, and are the Extender’s flow-control jumpers set
correctly (see
Section 5.5
)?
6. Is the PC a UNIX ® workstation? In order to operate correctly, some UNIX
workstations need to see the DCD signal from the serial device, but the
Extender doesn’t carry DCD. Call Black Box Technical Support if you’ve
ruled out the other possibilities and suspect that this might be your problem.
CHAPTER 8: Troubleshooting