XT09-PKT-RA-NA Digi International/Maxstream, XT09-PKT-RA-NA Datasheet - Page 11

• Manufacturer Part Number: XT09-PKT-RA-NA
• Description: MODEM RF 900MHZ RS232/485 INT
• Manufacturer: Digi International/Maxstream
• Series: XTend™r

Specifications of XT09-PKT-RA-NA

• Function: Transceiver, Modem
• Frequency: 900MHz
• Interface: RS-232
• Package / Case: Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Power - Output: -
• Applications: -
• Sensitivity: -
• Data Rate - Maximum: -
• Modulation Or Protocol: -

9XTend™ RS‐232/485 RF Modem ‐ Product Manual v2.x4x [2007.01.04]
RS-485/422 Connection Guidelines
Figure 2‐14. XTend RF Modem 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 Modem with the RS-485/422 protocol:
Figure 2‐15. Male DB‐9 to RJ‐45 Adapter (yellow)
Figure 2‐16. Female DB‐9 to RJ‐45 Adapter (green)
An XTend RS-232/485 RF Modem ‘Accessories Kit’ is available that includes connectors that facilitate
RS-485/422 and other serial communications. Refer to the Development Guide in Appendix B [p64]
for information regarding the connectors and tools included in the kit.
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© 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.
Chapter 2 ‐ Interfacing Protocol
11