Transmission Works Only in One Direction

XBee & XBee Gateway XBee Programamble (S2C & 900 HP)
1

I have two XBee modules: one is the XBP9B-DMSTB002, and the other is the XBP9B-DMUTB002. I bypassed both modules and successfully configured them. However, I’m encountering the following issue:

The XBP9B-DMSTB002 module can transmit data, and the other module receives it correctly. But when the XBP9B-DMUTB002 tries to send data, the XBP9B-DMSTB002 is unable to receive it.

I tested this setup over a distance of approximately 600 meters. The configuration parameters and antennas used for both modules are listed below.

*XBP9B-DMUTB002 ’ s config

define XBEE_ATCMD_PARAM_ID “3186”
define XBEE_ATCMD_PARAM_NI “UlganUydu”
define XBEE_ATCMD_PARAM_NT 0x146
define XBEE_ATCMD_PARAM_MT 0x5
define XBEE_ATCMD_PARAM_RR 0xF
define XBEE_ATCMD_PARAM_CE 0x2
define XBEE_ATCMD_PARAM_DH 0x0013A200
define XBEE_ATCMD_PARAM_DL 0x424D71AD
define XBEE_ATCMD_PARAM_AP 0x1
define XBEE_ATCMD_PARAM_AO 0x0
define XBEE_ATCMD_PARAM_TO 0x40
define XBEE_ATCMD_PARAM_HP 0x6
define XBEE_ATCMD_PARAM_BD 0x3
ufl’santenna = ANTX150P118B09153

*XBP9B-DMSTB002 ’ s config
define XBEE_ATCMD_PARAM_ID “3186”
define XBEE_ATCMD_PARAM_NI “UlganGCS”
define XBEE_ATCMD_PARAM_NT 0x146
define XBEE_ATCMD_PARAM_MT 0x5
define XBEE_ATCMD_PARAM_RR 0xF
define XBEE_ATCMD_PARAM_CE 0x1
define XBEE_ATCMD_PARAM_DH 0x0013A200
define XBEE_ATCMD_PARAM_DL 0x426BAE4D
define XBEE_ATCMD_PARAM_AP 0x1
define XBEE_ATCMD_PARAM_AO 0x0
define XBEE_ATCMD_PARAM_TO 0x40
define XBEE_ATCMD_PARAM_HP 0x6
define XBEE_ATCMD_PARAM_BD 0x3
sma antenna = ANT-B8-CW-QW-SMA

2

Set both modules with the CE and AP to 0. Then try just sending text data between them.

3

Okey i will try it but we have to use api mode in order to communicate with ground station application which is written by python code. Therefore , how can i communicate with api mode ?

4

Remember, you are only determining if they are able to talk to each other via a range test at the moment. Not in your application.

5

Okey , i will just set the CE and AP commands to 0 and try the range test. My configs are ,

*XBP9B-DMSTB002 ’ s config
define XBEE_ATCMD_PARAM_ID “3186”
define XBEE_ATCMD_PARAM_NI “UlganGCS”
define XBEE_ATCMD_PARAM_NT 0x146
define XBEE_ATCMD_PARAM_MT 0x5
define XBEE_ATCMD_PARAM_RR 0xF
define XBEE_ATCMD_PARAM_CE 0x0
define XBEE_ATCMD_PARAM_DH 0x0013A200
define XBEE_ATCMD_PARAM_DL 0x426BAE4D
define XBEE_ATCMD_PARAM_AP 0x0
define XBEE_ATCMD_PARAM_AO 0x0
define XBEE_ATCMD_PARAM_TO 0x40
define XBEE_ATCMD_PARAM_HP 0x6
define XBEE_ATCMD_PARAM_BD 0x3

*XBP9B-DMUTB002 ’ s config

define XBEE_ATCMD_PARAM_ID “3186”
define XBEE_ATCMD_PARAM_NI “UlganUydu”
define XBEE_ATCMD_PARAM_NT 0x146
define XBEE_ATCMD_PARAM_MT 0x5
define XBEE_ATCMD_PARAM_RR 0xF
define XBEE_ATCMD_PARAM_CE 0x0
define XBEE_ATCMD_PARAM_DH 0x0013A200
define XBEE_ATCMD_PARAM_DL 0x424D71AD
define XBEE_ATCMD_PARAM_AP 0x0
define XBEE_ATCMD_PARAM_AO 0x0
define XBEE_ATCMD_PARAM_TO 0x40
define XBEE_ATCMD_PARAM_HP 0x6
define XBEE_ATCMD_PARAM_BD 0x3

6

Hello again,
I have recently tested CE and AP =0 parameters with same experiment, unfortunately nothing have changed.

7

What happens if you use the range test option in XCTU using the Loop back cluster ID?

8

We can not use range test option because of bypass mode. We can not get dbm values.

9

Yes you can use the range test option in XCTU. You just need to tell XCTU that this module is a Programmable module.