参数资料
型号: A09-HASM-675
厂商: Digi International/Maxstream
文件页数: 68/71页
文件大小: 0K
描述: ANT 900MHZ 6" R/A JOINT W/RPSMA
标准包装: 25
系列: A09-HASM
天线类型: 鞭状:1/2 波,直角
频带数目: 1
频率: 915MHz(902MHz ~ 928MHz)
增益: 2.1dBi
端子: RP-SMA
安装类型: 连接器
包装: 散装
9XTend? ? OEM ? RF ? Module ?‐? Product ? Manual ? v2.x4x ? [2007.01.04]
Appendix ? B: ? Development ? Guide
Figure ? B ‐ 24. ?? XTend ? Module ? Assembly ? in ? an ? RS ‐ 422 ? environment
RS-485/422 Connection Guidelines
The RS-485/422 protocol provides a solution for wired communications that can tolerate high
noise and push signals over long cable lengths. RS-485/422 signals can communicate as far as
4000 feet (1200 m). RS-232 signals are suitable for cable distances up to 100 feet (30.5 m).
RS-485 offers multi-drop capability in which up to 32 nodes can be connected. The RS-422 proto-
col is used for point-to-point communications.
Suggestions for integrating the XTend RF Module with the RS-485/422 protocol:
1.
2.
3.
4.
When using Ethernet twisted pair cabling: Select wires so that T+ and T- are connected to
each wire in a twisted pair. Likewise, select wires so that R+ and R- are connected to a
twisted pair. (For example, tie the green and white/green wires to T+ and T-.)
For straight-through Ethernet cable (not cross-over cable) - The following wiring pattern
works well: Pin3 to T+, Pin4 to R+, Pin5 to R-, Pin6 to T-
Note that the connecting cable only requires 4 wires (even though there are 8 wires).
When using phone cabling (RJ-11) - Pin2 in the cable maps to Pin3 on opposite end of
cable and Pin1 maps to Pin4 respectively.
? ? 2007 ? MaxStream, ? Inc.
????? 68
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