MDS TransNET 900 Specifications download pdf (Page 42)

32 MDS TransNET Ref. Manual MDS 05-2708A01, Rev. E

For CTS Key operation (see the DEVICE command), the timer specifies how

long to wait after asserting the CTS line before sending data out the

DATA

port. A timer value of zero means that data will be sent out the data port

without imposing a key-up delay. (Other delays may be in effect from other

radio operating parameters.)

CTSHOLD [0–60000]

Clear-to-Send Hold Time

Used in DEVICE CTS KEY mode, 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

DATA 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 60000 (i.e., 60 seconds). The

default value is 0, which means that CTS will drop immediately after the last

character is transmitted. If the command is entered when the radio is in

DEVICE DCE mode, the response CTSHOLD N/A will be displayed.

DEVICE [DCE, CTS KEY]

Radio-MODEM Behavior

The DEVICE command sets or displays the device behavior of the radio. The

command parameter is either

DCE or CTS KEY.

The default selection is

DCE. In this mode, CTS will go high following RTS,

subject to the CTS programmable delay time. 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.

CTS KEY is selected, 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 CTS programmable 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 the

CTSHOLD command. CTSHOLD should be set

sufficiently high.

DLINK [xxxxx/ON/OFF]

InSite Diagnostics Link Support

DLINK ON enables use of Diagnostic Link mode and establishes it as the

default protocol on the RJ-11

DIAG port. Diagnostic Link mode is a special

protocol used to support Network-Wide Diagnostics.

DLINK must be set to

ON to support connection to InSite or to support chained diagnostics between

radio networks even while the radio is in sleep mode.

DLINK OFF disables this

feature. The default setting is

ON.

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MDS TransNET 900 Specifications Page 42

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