GE MDS TransNEXT NET9L, Техническое руководство

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40 MDS TransNEXT Technical Manual MDS 05-7280A01, Rev. A
3.3.7.5 com1.rxd [0-255]
This is the receive data delay in milliseconds. Default is 0.
This attribute sets a delay, in milliseconds to pause after data would normally be delivered to the port.
The typical intent is to remove character gaps in data delivery. When set to a value sufficient to cover
radio.hoptime and retransmissions this will emulate a seamless data delivery mode. This is useful for
protocols such as Modbus. Use a delay of twice the value of the radio.hoptime period; if retries are used
multiply that value by the typical retry count; if radio.saf is “on”, multiply by 2 again.
3.3.7.6 com1.cts [0-255]
This attribute sets a delay associated with CTS (clear-to-send) line response. Valid values are 0 to 255
milliseconds. Default is 0.
For DCE operation, the attribute specifies how long to wait after the RTS line goes high before asserting
the CTS line. A timer value of zero means that the CTS line will be asserted immediately following the
assertion of RTS.
For CTS Key operation (see the com1.device setting), the timer specifies how long to wait after asserting
the CTS line before sending data out the COM port. A timer value of zero means that data will be sent out
the com port without imposing a key-up delay. (Other delays may be in effect from other radio operating
parameters.)
3.3.7.7 com1.ctshold [0-65535]
This attribute sets a delay associated with CTS (clear-to-send) hold time. Valid values are 0 to 65535
milliseconds. Default is 0.
Used when com1.device is “cts key”, this command sets the amount of time in milliseconds that CTS
remains present following transmission of the last character out the RXD pin of the com port. This “hold
time” can be used to prevent squelch tail data corruption when communicating with other radios.
The CTSHOLD setting can range from 0 to 65535 (i.e., over 65 seconds). The default value is 0, which
means that CTS will drop immediately after the last character is transmitted.
3.3.7.8 com1.device [
“dce” or “cts key”]
This attribute sets the device behavior of the com port. The default is “dce”.
In DCE mode, CTS will go high following RTS, subject to the com1.cts delay value. Keying is stimulated
by the input of characters at the data port. Hardware flow control is implemented by dropping the CTS
line if data arrives faster than it can be transmitted.
In CTS KEY mode, the radio is assumed to be controlling another radio, such as in a repeater or tail-end
link system. The RTS line is ignored and the CTS line is used as a keyline control for the other radio.
CTS is asserted immediately after the receipt of RF data, but data will not be sent out the DATA port until
after the com1.cts delay time has expired. (This gives the other radio time to key.) Following transmission
of the last byte of data, CTS will remain asserted for the duration specified by com1.ctshold. The
com1.ctshold value should be set sufficiently high.
3.3.7.9 com1.port ["rs232" or "rs485"]
This attribute sets the electrical signaling behavior of the serial port. Default is “rs232”.
Pin descriptions for RS-232 are given in Table 2-2. COM Port Pin Details (RS-232).