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User’s Manual
3. Connectors and Switches
The following describes the connectors and pins of the ESERV-10.
Serial Port (RS-232, RS-422/485 -connector)
Serial connector is a 9-pin male connector (DB9). A null modem cable can be used to connect the
ESERV-10 to a device or a PC. The ESERV-10 supports CTS/RTS flow control. The figure of
ESERV-10’s DB9 (DTE) Male connector is shown below:
1
5
6
9
The pin description in case of RS-232 -connector is following:
Pin
Number
Name Direction
Explanation
1
NC/PSU (IN/OUT)
Pin can be used as an optional power supply (+) for ESERV-10
or the target device.
2 RXD
IN
Receive
data
3 TXD
OUT
Transmit
data
4 NC
Not
connected
5 GND
- Signal
ground
6 NC
Not
connected
7
RTS
OUT
Ready To Send. Handshake output
8
CTS
IN
Clear To Send. Handshake input
9
NC/PSU (IN/OUT)
Pin can be used as an optional power supply (-) for ESERV-10 or
the target device.
In case of RS-422/485 the pin description is as follows
Pin
Number
RS-422
RS-485
Direction Explanation
1
NC/PSU (IN/OUT)
Pin can be used as an optional power supply (+) for ESERV-10
or the target device.
2
RXD
+
IN Non-inverted data input
3
TXD
–
OUT
Inverted data output
4 NC
NC
Not
connected
5 NC
NC
Not
connected
6 NC
NC
Not
connected
7
TXD+
OUT
Non-inverted data output
8
RXD-
IN
Inverted data input
9
NC/PSU (IN/OUT)
Pin can be used as an optional power supply (-) for ESERV-10 or
the target device.
Note:
Make sure that you do not connect RS-422 or RS-485 devices to port that is configured as
RS-232.
ESERV-10
11
Viola Systems Ltd.