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| 型号： | MT9234MU-CDC-CP |
| 厂商： | Multi-Tech Systems |
| 文件页数： | 55/66页 |
| 文件大小： | 0K |
| 描述： | MODEM V.92 DATA/FAX USB WORLD 25 |
| 标准包装： | 1 |
| 系列： | MultiMobile™ USB |
| 数据格式： | V.34，V.92 |
| 安装类型： | 台式 |
| 封装/外壳： | 3.1" L x 1.3" W x 1.0" H（80mm x 30mm x 25mm） |
| 包装： | 散装 |
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Chapter 4 – Voice Commands
Interface Configuration Commands
The commands in this section are used to define the interface between the PC and the modem.
+VBT
Description:
Syntax:
Values:
Reports:
Example:
Result Codes:
Set Modem Flow Control Assert and Deassert Points
The +VBT= command is used to set the flow control assert and deassert points
inside the modem's internal transmit buffer. As data is sent from the PC to the
modem and is stored in the modem's buffer, when the number of octets in the buffer
equals the <assert> value, the modem asserts flow control to the PC (e.g., turns off
CTS circuits, or sends an XOFF character). As the modem removes data from the
buffer and processes the data, when the number of octets in the buffer equals the
<deassert> value, the modem de-asserts flow control (e.g., turns on CTS circuits, or
sends an XON character). The modem may inform the PC (using the +VBT=?
command) that the PC does not permit the modifying of the flow control assert and
deassert points by returning a single value, not in the range of values, for each
control point.
The +VBT= command controls the amount of "skid" in the modem's voice buffer,
where "skid" is the amount of octets that the modem could accept before losing data
after the modem asserts an off flow control signal to the PC.
You can use the +VBT= command to balance performance versus robustness. For
example, if the PC knows there are only 16450 UARTs present, a small "skid" is
probably sufficient. If there are 16550 UARTs present, a larger "skid" is probably
required.
AT+VBT=<deassert>,<assert>
<assert> and <deassert> are buffer offsets from the start of the buffer. The buffer's
first position is 0. The offset units are octets.
+VBT? Displays current or selected values.
+VBT=? Displays the possible <assert> and <deassert> values set by the +VBT=
command, followed by the OK result code.
In the lines below, the +VBT=? command is used to ask about the modem's flow
control and buffer size ranges. The modem reports the deassert point is adjustable
between 20 and 100 octets, the assert point is adjustable between 150 and 180
octets, and the transmit buffer size is 200 octets.
AT+VBT=?
(20-100) , (150-180) , (200)
OK
OK if the modem accepts the command
ERROR if either the <assert> or <deassert> parameter is greater than the buffer size,
or if the <de-assert> parameter is greater than or equal to the <assert> value.
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H)
55
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相关代理商/技术参数 |
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| MT9234MU-CDC-XR | 功能描述:MODEM V.92 DATA/FAX USB WORLD RoHS:是 类别:计算机，办公室 - 元件，配件 >> 调制解调器 系列:MultiMobile™ USB 标准包装:1 系列:MultiModem® ZBA 数据格式:V.34，V.92 波特率:- 电源电压:- 安装类型:台式 封装/外壳:5.7" L x 4.3" W x 1.0" H（145mm x 109mm x 25mm） 供应商设备封装:- 包装:散装 |
| MT9234MU-CDC-XR-CP | 制造商:Multi-Tech Systems 功能描述:V.92 DATA/FAX WORLD MODEM (USB) (25 MODEMS) - Bulk |
| MT9234SMI | 制造商:MULTI TECH SYSTEM 功能描述: |
| MT9234SMI-92 | 功能描述:拨号模块 V.92 Serial Data V.34 FAX - 5V RoHS:否 制造商:Multi-Tech Systems 产品:Data / Fax Modems 最大数据速率:56 kbps 存储类型:Flash 接口类型:Serial 工作电源电压:3.3 V 工作电源电流:95 mA 功耗:310 mW 最大工作温度:+ 70 C 尺寸:64.5 mm x 26.5 mm x 17 mm |
| MT9234SMI-92.R1 | 功能描述:拨号模块 V.92 Serial Data V.34 Fax 5V RoHS:否 制造商:Multi-Tech Systems 产品:Data / Fax Modems 最大数据速率:56 kbps 存储类型:Flash 接口类型:Serial 工作电源电压:3.3 V 工作电源电流:95 mA 功耗:310 mW 最大工作温度:+ 70 C 尺寸:64.5 mm x 26.5 mm x 17 mm |
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