Multitech RF310E User's Guide download pdf (Page 131)

Appendix D - AT Command Summary

RF300E/RF310E 131

occur before dialing begins. See the description of S-register S80 for further details

regarding its interaction with $Dn.

Command: &En

Function: Flow Control

Unit: Decimal ASCII code

Values: n=3—Disable flow control by the TA.

n=4—Hardware flow control. &E4 causes the TA to use the CTS signal on pin 5 of

the RS232E/V.24 interface to regulate flow control. When CTS goes low, data flow

from the computer is suspended until CTS goes high again. This method works with

pacing, which uses the RTS signal on pin D. Hardware flow control cannot be

enabled unless an error correction protocol is selected.

n=5—XON/XOFF flow control. This is an in-band method, in which the XON and

XOFF characters (^Q and ^S respectively) are inserted into the data stream,

rather than using separate control lines. When an XOFF character is detected, the

data stream is suspended until an XON character is detected. The drawback to this

method is that some files may contain these characters, causing the file transfer to

be suspended indefinitely.

n=6—When XON/XOFF pacing is active, the TA responds to and discards the XON/

XOFF characters from the computer.

n=7—When XON/XOFF pacing is active, the TA responds to the XON/XOFF

characters and passes them through the communications link to the remote device,

thereby

pacing the remote terminal adapter as well.

n=12—Disable pacing.

n=13—Enable pacing.

Default: &E4, &E6, &E13

Description: The &En command selects the method by which the TA controls the flow of data to

and from the computer, to prevent either device from accepting data faster than it

can handle. The TA provides flow control in both directions. When the TA halts data

flow, it is termed flow control; when the computer halts data flow, it is termed pacing.

Command: &Rn

Function: CTS Control

Unit: Decimal ASCII code

Values: n=0—CTS acts normally; that is, it follows RTS.

n=1—CTS is forced high, but still provides online flow control.

n=2—CTS is forced high, but it drops on disconnect for the period of time set by S10.

CTS still provides flow control when the TA is online.

Default: &R1 (CTS forced high)

Description: The &Rn command lets you control the state of the CTS (Clear to Send) signal on

the RS232E/V.24 interface. Normally the CTS signal follows the state of the RTS

signal when the TA is online.

Command: &RFn

Function: CTS/RTS Interaction Control

Unit: Decimal ASCII code

Values: n=0 (CTS follows RTS when on-line), n=1 (CTS is independent of RTS when on-line)

Default: &RF1 (CTS is independent of RTS when on-line)

Description: In normal operation, Clear-to-Send (CTS) follows Request-to-Send (RTS) when the

modem is on-line. In other words, if RTS goes off, CTS goes off in response. The

&RF0 command enables CTS to follow RTS. In some applications, however, it may

be necessary for CTS to operate independently of RTS. &RF1 allows CTS to operate

independently regardless of the state of RTS, and is the factory default. If this is the

case, refer to the &R command for control of the Clear-to-Send signal. The &RFn

command has effect only when using &R0 (CTS acts normally—CTS follows RTS).

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