This connector is used on our ST-1016, ST-1616, ST-1600, ST-1002, and ST-1008 products.
+--------------------------+
| pin | signal | direction |
Female DB-25 DTE |--------------------------|
| 2 | TxD | out |
___________ | 3 | RxD | in |
( 13......1 ) | 4 | RTS | out |
\ 25...14 / | 5 | CTS | in |
`-------' | 6 | DSR | in |
| 7 | GND | n/a |
| 8 | DCD | in |
| 20 | DTR | out |
+--------------------------+
This connector is used on our SC-1016, SC-1600, ST-2008, ST-1800, ST-1800P, ST-1400, ST-1610, and ST-8008 products.
.---. +--------------------------+
_| |_ | pin | signal | direction |
| | |--------------------------|
.-----~ ~-----. | 1 | RTS | out |
| | | 2 | DSR | in |
| | | 3 | DCD | in |
| | | 4 | RxD | in |
| | | 5 | TxD | out |
| | | 6 | GND | n/a |
| | | 7 | DTR | out |
+__|_|_|_|_|_|_|_|__+ | 8 | CTS | in |
8 7 6 5 4 3 2 1 +--------------------------+
Below, I show a few sample wiring configurations and give examples for DB25 to DB25, and then also DB25 to our flavor of RJ45. Rather than clog up the page with some redundancy, simply use the pin definitions here and translate the DB25 to DB25 cable examples below accordingly. The signal names are the same, and serve the same purpose. Only the pin numbers change in the wiring diagram.
+--------------------------+
| pin | signal | direction |
Male AT-style DB-9 DTE |--------------------------|
| 1 | DCD | in |
___________ | 2 | RxD | in |
( 1.......5 ) | 3 | TxD | out |
\ 6.....9 / | 4 | DTR | out |
`-------' | 5 | GND | n/a |
| 6 | DSR | in |
| 7 | RTS | out |
| 8 | CTS | in |
| 9 | RI | in |
+--------------------------+
(DTE) (DTE) ----- ----- SG ----------- SG TxD ----------- RxD RxD ----------- TxD RTS ----------- CTS CTS ----------- RTS DSR --+ DCD --+-------- DTR GND ----------- GND DTR --------+-- DSR +-- DCD Example pin connections: ------------------------ DB-25 -> DB-25 CD RJ-45 -> DB-25 -------------- ----------------- 2 -> 3 TxD - RxD 5 -> 3 3 -> 2 RxD - TxD 4 -> 2 4 -> 5 RTS - CTS 1 -> 5 5 -> 4 CTS - RTS 8 -> 4 7 -> 7 GND - GND 6 -> 7 6+8 -> 20 DSR+DCD - DTR 3 -> 20 (DCD - DTR) 20 -> 6+8 DTR - DSR+DCD 7 -> 8 (DTR - DCD) 2 -> n/c or pin 6 (see note below)Notes:
(DTE) (DTE) ----- ----- SG) ----------- SG TxD ----------- RxD RxD ----------- TxD DCD --+ +-- DCD | DSR --+ +-- DSR |- modem control loopback DTR --+ +-- DTR | GND ----------- GND RTS --+ +-- CTS | CTS --+ +-- RTS |- hardware flow control loopback Example pin connections: ------------------------ DB-25 -> DB-25 CD RJ-45 -> DB-25 -------------- ----------------- 2 -> 3 TxD - RxD 5 -> 3 3 -> 2 RxD - TxD 4 -> 2 6+8+20 DSR+DCD+DTR 2, 3, and 7 not connected. (see note below) 7 -> 7 GND - GND 6 -> 7 4+5 RTS+CTS 1 and 8 not connected. (see note below)Notes:
Some terminals are designed to use DTR and CTS for hardware flow control instead of the more common RTS/CTS pairing. Some serial PRINTERS are also designed this way. In these cases, the following wiring makes the most sense:
(DTE) (Terminal/Printer) ----- ------------------ SG ------------- SG TxD ------------- RxD RxD ------------- TxD RTS ------------- CTS CTS ------------- DTR GND ------------- GND DSR --+ DCD --+ DTR --+ Example pin connections: ------------------------ DB-25 -> DB-25 CD RJ-45 -> DB-25 -------------- ----------------- 2 -> 3 TxD - RxD 5 -> 3 3 -> 2 RxD - TxD 4 -> 2 4 -> 5 RTS - CTS 1 -> 5 5 -> 20 CTS - DTR 8 -> 20 7 -> 7 GND - GND 6 -> 7 6+8+20 -> n/c DSR+DCD+DTR 2 -> not connected. + 3 -> not connected. +-(see note below) 7 -> not connected. +Notes: