A09-HSM-7 Digi International/Maxstream, A09-HSM-7 Datasheet - Page 68

• Manufacturer Part Number: A09-HSM-7
• Description: ANT 900MHZ 7" STRAIGHT W/RPSMA
• Manufacturer: Digi International/Maxstream

Specifications of A09-HSM-7

• Antenna Type: Whip: 1/2 Wave
• Number Of Bands: 1
• Frequency: 915MHz (902MHz ~ 928MHz)
• Vswr: 2
• Gain: 2dBi
• Termination: RP-SMA
• Mounting Type: Connector
• Height (max): 7.0" (177.8mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9XTend™ OEM RF Module ‐ Product Manual v2.x4x [2007.01.04]
RS-485/422 Connection Guidelines
Figure B‐24. XTend Module Assembly in an RS‐422 environment
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.
© 2007 MaxStream, Inc.
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.
Appendix B: Development Guide
68