Technical data

Technical Datasheet
&
User’s Manual
Narrowband multi-channel data radio modem
LinkWiser™-S400M Rev. 2.1
Cellution Inc.
#317, NKIC, 48-84 Honguen-1dong, Seodaemun-gu, Seoul, Korea Zip: 120-760
Enquiries: [e-mail]
/ [e-mail]
Voice: [phone] / Fax: [phone]
14
12-4-2 Tx power control
Reading: Reading: ‘AT+P?’
Answer: TxPower: 8
10dBm
Writing: ‘AT+P=8’ // Set the Tx power at 8
th
level
Answer: >
Description: Power of the Radio
Value Tx power (dBm)
8 < 10dBm
7 < 9dBm
6 < 7.9dBm
5 < 6.3dBm
4 < 4.4dBm
3 < 2dBm
2 < -1.3dBm
1 < -7.0dBm
0 < -40dBm
12-4-3 RSSI level
Reading: ‘AT+CSQ?’
Answer: ‘n’
Description: ‘n’ is a realistic RSSI level in the unit of ‘dBm’. (-60~-120)
Caution: One time RSSI level reading may not be correct due to circumstances. Thus, more
than three times of RSSI level readings are recommended.
12-4-4 Destination address setting
Reading: ‘AT+ADDR?’
Answer: destination ID: ‘n’ // n ranges 0~255
Writing: ‘AT+ADDR=n’
Description: ADDR means a destination ID, if it is set ‘0’ in the ADDR, the radio enters into the
Transparent mode. while it is set ‘1~255’ in the ADDR, the radio enters into the Address mode and
delivers data to the preset destination ID of node only.
12-5 Timing Chart
12-5-1 Maximum Packet Size
The LinkWiser accepts 256bytes of packet size of USER DATA only as its one time maximum FIFO
(First-In-First-Out) is 256bytes. If your packet size (USER DATA) exceeds over 256bytes, then you
have to split them into several appropriate size of packets with considering the below timing chart & air
rate. And also you have to put some delay between that divided packet and the packet with
considering the below timing chart & air rate in order to complete successful transmission.
12-5-2 Timing Chart Overview
Figure1 shows a typical system block diagram comprising hosts (DTE user’s application) connected to
LinkWiser. Host(A) will be sending and Host(B) will be receiving and processing this data.