ERECA SR2 - Optional Connectors; Description; RS422 Option Pinout

SR2 Technical Manual EN
Indice : C 25/03/2019
Firmware v2.9
20 / 31
ERECA SAS - 75 rue d'Orgemont, 95210 St Gratien France T : +33 1 39 89 76 23 W : www.ereca.fr
2.5 OPTIONAL CONNECTORS
2.5.1 Description
Available hardware options
There are two hardware options available on D-Sub25
connectors:
• 6 additional 500Kbps RS422 channels
In this case the 6 LED next to the connector will
display the IN/OUT activity of each additional serial
links.
• DC input Provision for D sub socket with power inserts
to connect a 10-16 VDC battery to power the Stage
Racer 2, used in case of mains power loss.
Caution: The DC input is protected by internal fast acting fuse, any polarity reversal will blow the fuse. Due
to the high current involved a resettable protection is not possible.
2.5.2 RS422 option pinout
One D SUB 25 pin female socket provides access to additional RS422 optional channels 1 to 6.
Channel SIGNAL
Socket
contact
D SUB
25
RS422 1to6
Socket
contact
SIGNAL
1
(3)
IN 1
-
1
1
25
14
13
14
IN 1 +
1
(3)
OUT 1 +
2
15
OUT 1
-
2
(4)
IN 2
-
3
16
IN 2 +
2
(4)
OUT 2 +
4
17
OUT 2
-
3
(5)
IN 3
-
5
18
IN 3 +
3
(5)
OUT 3 +
6
19
OUT 3
-
all
GND
7
20
IN 4
-
4
(6)
IN 40 +
8
21
OUT 4 +
4
(6)
OUT 4
-
9
22
IN 5
-
5
(7)
IN 5 +
10
23
OUT 5 +
5
(7)
OUT 5
-
11
24
IN 6
-
6
(8)
IN 6 +
12
25
OUT 6 +
6
(8)
OUT 6
-
13
Remark: (x) denotes the logical channel in the GUI.
It is strongly recommended to connect the shield of the signals transmitted to the GND pin.
Each LED summarize the Input and Output signal activity on the corresponding channel.
Each signal activity is also reported on the web interface.
Each differential input is not 120Ohms loaded internally for optimum compatibility with transmitted protocols.
If impedance matching is needed a small SFR16 resistor could be added directly on the D SUB pins,
together with the signal wire.
Note 1: For RS 485 Telex/RTS talkback panels please ask ERECA for wiring tip.
Note 2: As the differential inputs are unloaded internally a small crosstalk should happen on the adjacent
channel only if it is unused and left floating.