13
© Sealevel Systems, Inc.
RELIO R2 SYNC Manual | SL9255 10/2021
Interface Selection
The R2 SYNC supports a variety of electrical interfaces. Refer to the Control and Status Register Definitions
found in the Technical Description section of this manual for this bit description. There is line termination on
RXD, RXC and TXC in the following modes: RS-530, RS-530A, RS-485T and V.35. This table is provided for
users that desire to write their own driver. By default, at power-up, all signals are high impedance.
HEX
M3
M2
M1
M0
Interface Mode
0
0
0
0
0
All signals are high impedance
1
0
0
0
1
* not supported *
2
0
0
1
0
RS-232
3
0
0
1
1
* not supported *
4
0
1
0
0
RS-485T with 120
termination
5
0
1
0
1
RS-485 without termination
6,7,8,9
0
1
1
0
* not supported *
A
1
0
1
0
single ended loopback
B
1
0
1
1
differential loopback
C
1
1
0
0
* not supported *
D
1
1
0
1
RS-530
E
1
1
1
0
V.35
F
1
1
1
1
RS-530A
100-Pin Connector Pin Out
The R2 SYNC has a 100-pin high-density connector and includes a cable (Item# CA339) that breaks out to four
(4) DB25 male connectors. The pin outs for RS-232, RS-485, RS-530, RS-530A and V.35 interfaces on the DB25
connectors are listed on the following pages. For customers designing their own cable, the mating 100-pin
connector is AMP Part# 5787169-9. The pin out for the 100-pin connector is listed below.
