DE6277
1
SHM
SHM
SHM
SHM-1
-1
-1
-1
Short-Range Modem RS-232/RS-422
Installation Instructions
1
11
1. INTRODUCTION
. INTRODUCTION
. INTRODUCTION
. INTRODUCTION
SHM-1 is a short-range modem whose operation is based on
RS-232 and RS-422 serial communication format.
The modem is connected between a controller (for example,
AXS-100 access control system) and a computer.
Using the modem enables data communication range of up to
1200 meters.
Few modems can be used to increase the communication range
in 1200 meters increments.
Figure 1 - External View
Access Cont. System
(e.g., AXS-100)
SHM-1
Modem #2
PC
RS-422 comm. up to 1200m
(shielded cable)
Tx
Rx
Rx
Tx
Gnd
Tx
Rx
Rx
Tx
Gnd
Tx+
Rx+
Rx-
Gnd
Gnd
Tx-
Gnd
Gnd
Rx+
Rx-
Tx-
Tx+
Esc
Enter
3
6
9
2
5
8
0
No
1
Yes
4
7
Gnd
Gnd
RS-232
comm.
RS-232
comm.
9-12V DC/AC
9-12V DC/AC
Serial
port
See note
SHM-1
Modem #1
Figure 2 - Using SHM-1 Modem to Increase Data Communication Range
*
Important Note:
All the entering to / exiting from wires should be connected to the same channel (1 or 2) terminals.
Tx
Rx
Rx
Tx
Gnd
Tx
Rx
Rx
Tx
Gnd
Tx+
Rx+
Rx-
Gnd
Gnd
Tx-
Gnd
Gnd
Rx+
Rx-
Tx-
Tx+
Esc
Enter
3
6
9
2
5
8
0
No
1
Yes
4
7
Gnd
Gnd
Rx+
Rx-
Gnd
Tx-
Tx+
Tx+
Gnd
Tx-
Rx+
Rx-
9-12V DC/AC
9-12V DC/AC
9-12V DC/AC
Serial
port
Shielded
cable
Access Cont. System
(e.g., AXS-100)
SHM-1
Modem #1
SHM-1
Modem #2
SHM-1
Modem #3
RS-422 comm.
up to 1200m
RS-422 comm.
up to 1200m
RS-232
comm.
RS-232
comm.
PC
Shielded
cable
Figure 3 - Using Additional SHM-1 Modem to Increase Data Communication Range
2
22
2. SPECIFICATIONS
. SPECIFICATIONS
. SPECIFICATIONS
. SPECIFICATIONS
Communication Channels Number:
2
Communication Format:
RS-232 and RS-422
Power Supply:
9-12 VDC or 9-12 VAC (9 VDC power supply
unit is supplied with the modem)
Maximum Current Consumption:
50 mA
LEDs Number:
3, one for power indication and two for data
communication indication in both channels
Operating Temperatures:
-20
°
C to 49
°
C (4
°
F to 120
°
F)
Dimensions (LxWxD):
115x73x29 mm (4-1/2x2-7/8x1-1/4 in)
Weight:
125 g (4.4 oz)
Color:
Black
Recommended Connection Wires:
Twisted shielded pairs
3
33
3.
. .
. INSTALLATION AND WIRING
INSTALLATION AND WIRING
INSTALLATION AND WIRING
INSTALLATION AND WIRING
Figure 4 - Mounting
