Microtronix Access User Guide
10.2 WAN Port – Synchronous Operation
The WAN port provides a choice of RS232 (V.24), RS530, RS530A, RS449, X.21, or V.35 signals in a
DB25F connector with standard RS530 DCE pin configuration.
When configured for synchronous or X.25 operation, the device name is hdlc0 (WAN port 0), and hdlc1
(WAN port 1) on the 4002-Snn model.
In RS530, RS449, and X.21 modes, all signals are balanced and have 2 pins per function (A/B). In
RS232, only single ended signals are used with a common ground (SG), and the B pins are not used.
In V.35 mode, control signals are unbalanced, and data/clock signals are balanced. All balanced
signals (A and B) require twisted pair wires in the cable. Unbalanced signals (A only) do not.
The following table shows the RS530 pin configuration of the WAN port.
Note:
Receive clock (RxC A/B) on pins 17/9 is bi-directional and depends on the clock configuration of
the port. Transmit clock (TxC A/B) is either output on pins 15/12 or input on pins 24/11 depending on
the clock configuration. Refer to the following sections for appropriate cabling for each clock
configuration.
67
Pin #
Direction
Signal Name
1
---
FG
2
input
TxD A
3
output
RxD A
4
input
RTS A
5
output
CTS A
6
output
DSR A
7
---
SG
8
output
DCD A
9
i/o
RxC B
10
output
DCD B
11
input
(E)TxC B
12
output
TxC B
13
output
CTS B
14
input
TxD B
15
output
TxC A
16
output
RxD B
17
i/o
RxC A
18
19
input
RTS B
20
input
DTR A
21
22
output
DSR B
23
input
DTR B
24
input
(E)TxC A
25
