Machine to machine connections, Serial connection other, Serial connection – Perle Systems DS1 User Manual
Page 35: Other
Machine To Machine Connections
Configuring the Device Server 35
Serial Connection
You also need to know the serial interface specifications as follows:
z
EIA-232 and its speed
z
EIA-422 and its speed
z
EIA-485 and
–
its speed
–
half duplex with/without echo suppression or full duplex
–
TX driver control is automatic or RTS
Other
The most important thing to keep in mind when configuring the hardware parameters is to make sure
that they are consistent with the serial device you have connected to the port. So, if you are
connecting to a modem that sends out a DSR signal, you probably want to turn the
Monitor DSR
option on. Following is a list of just some of the other hardware configuration options:
z
Data Bits—5 to 8
z
Stop Bits—1, 1.5, 2
z
Monitor DSR—on, off
z
Monitor DCD—on, off
z
Parity—None, Odd, Even, Space, Mark
z
Flow—Software, Hardware, or None
Machine To Machine Connections
If you are using the Device Server to connect two hosts, allowing data to flow freely between them,
you just need to configure the
Server
and the
Line
(no
User
required). In the following example, the
serial device is a security Card Reader that needs to transmit and receive information to/from a host
on the network that maintains the Card Reader’s application every time an employee uses an access
card to attempt to gain entry to the company.
Network
Device Server
Card
Reader
Security
pe
rle
After configuring the
Server
parameters (
Server Name
,
IP Address
,
Ethernet
and Serial interfaces,
etc.), the
Line Service
is set to
Sil Raw
, which creates an automatic, continuous connection between
the Card Reader and its associated application on the Security host (though the Device Server), by
specifying the Security host name (which must already be configured in the Device Server’s Host
Table) and TCP/IP port number. Therefore, the Card Reader can make a request to the Security host
card reader application for employee verification, also logging access time, employee name, etc., and
the Security host application can send back a code that does or does not unlock the door.