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Chapter 2. Installation
2-4 Nx56/64 (EIA-530) Option Module User Manual 61200054L2-1
WIRING
The Nx56/64 (EIA-530) option module has a DB-25 Win-
chester-style connection, as shown in Figure 2-3.
Figure 2-3. DB-25 Pin Connection
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Clear to Send Return (CTS-B)
Transmit Clock Return (TC-B)
External TX Clock Return (ETC-B)
Data Carrier Detect Return (DCD-B)
Recieve Clock Return (RC-B)
Data Carrier Detect (to DTE) (DCD-A)
Signal Ground (SG)
Data Set Ready (to DTE) (DSR-A)
Clear to Send (to DTE) (CTS-A)
Request to Send (from DTE) (RTS-A)
Recieve Data (to DTE) (RD-A)
Transmit Data (from DTE) (TD-A)
Protective Ground, Cable Shield (PG)
(TM) Test Mode (to DTE)
(ETC-A) External TX Clock (from DTE)
(DTR-B) DTE Ready Return
(DSR) Data Set Ready Return
(RL) Remote Loopback*
(RTS-B) Request to Send Return
(LL) Local Loopback (from DTE)*
(RC-A) Recieve Clock (to DTE)
(RD-B) Recieve Data Return
(TC-A) Transmit Clock (to DTE)
(TC-B) Transmit Data Return
(DTR-A) DTE Ready
* Ignored by Nx56/64