WiSnap User Manual 2.21 04112011-JF
Page
9
of
66
2.6.4
Null-modem and Flow Control Jumpers
The WiSnap AAA Dongle serial interface can be configured to enable flow control and null modem
signalling. The jumper block is accessed by removing the battery cover from the WiSnap AAA
Dongle.
WARNING:
Flow control signals are NOT RS-232 signalling tolerant. If these are enabled
with the jumper, do not exceed 3.3 VDC or permanent damage can occur.
Male Units
Female Units
Male DB9 (Default Config)
Female DB9 (Default Config)
Jumper 1<>2, 3<>4
Jumper 2<>4, 1<>3
Male DB9 - Null Modem
Female DB9 - Null Modem
Jumper 2<>4, 1<>3
Jumper 1<>2, 3<>4
Drive DTR on pin 4 of the male DB9
Jumper 7<>8
Drive DSR on pin 6 of the male DB9
Jumper 5<>6
Drive DCD on pin 1 of the male DB9
Jumper 9<>10
10
8
6
4
2
9
7
5
3
1
10
8
6
4
2
9
7
5
3
1
10
8
6
4
2
9
7
5
3
1
10
8
6
4
2
9
7
5
3
1
10
8
6
4
2
9
7
5
3
1
10
8
6
4
2
9
7
5
3
1
10
8
6
4
2
9
7
5
3
1
