User Manual
4 MHX-920 Operating Manual: Chapter 2 Electrical/Physical
2.1 Pinout
Figure 2 provides a top-view pinout drawing of the MHX-920 module. The
corner pins (1,20,21,40) are labeled directly on the module.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
AVcc
AVcc
DVcc
DVcc
DVcc
DVcc
DVcc
NC
\Config
\Reset
GND
GND
GND
GND
GND
GND
GND
NC
NC
NC
NC
NC
NC
NC
NC
Rx/SYNC
TxMODE
RSSI3
RSSI2
RSSI1
CTS
RTS
DSR
NC
DTR
TxD
MHX-910
19
20
NC
NC
RxD
DCD
37
38
39
40
Figure 2 - Pinout (Top View)
Table 1. Pin Description
Pin Name No. Description I/O
AVcc 1,2 Positive Supply for Radio Circuitry. See Section
2.3 for DC Characteristics
I
\Config 9
Leave unconnected. For factory use only. Do
not ground
CTS 28 RS-232 Clear to Send. Active low (TTL level)
output. See Appendix B for a complete description
of all RS-232 signals.
O
DCD 21 RS-232 Data Carrier Detect. Active low (TTL
level) output.
O
DSR 26 RS-232 Data Set Ready. Active low (TTL level)
output.
O
DTR 24
RS-232 Data Terminal Ready. Active low
(TTL level) input.
I
DVcc 3-7
Positive Supply for Logic circuitry and I/O
pins. See Section 2.3 for DC Characteristics
I