Honeywell BCRU211G

Honeywell BCRU211G
Manufacturer	Honeywell
Model	BCRU211G
Firmware
Code Chart	Honeywell BCRU211G

Images

• 
• 
• 
• 
• 
• 
• 
• 
• 

Honeywell BCRU221G

This is another one of the Honeywell serial terminals that were typically used with DPS mainframes, after Honeywell took over the line of GCOS-based mainframes from General Electric. Probably used with DPS6 mainframes (confirmation needed).

In terms of control characters, it has a lot of similarities with the VT52, but without ANSI compatibility mode, and without the GEMDOS/TOS extensions, but it also has a bunch of extra features (and quirks!).

Hardware connectivity

A typical db25 serial cable doesn't seem to work, nor does the typical null-modem cable. Instead, following pinout seems to work:

DB25 pinout:

--------------------------------------------------------------------
\ (1 ) (2 ) (3 ) (4 ) (5 ) (6 ) (7 ) (8 ) (9 ) (10) (11) (12) (13) /
 \   (14) (15) (16) (17) (18) (19) (20) (21) (22) (23) (24) (25)  /
  \______________________________________________________________/

  1: Shield ground          6: DSR (data set ready)      11: N/C
  2: TXD (transmit data)    7: Signal ground             12: DCD (2)
  3: RXD (receive data)     8: DCD (data carrier detect) 13: CTS (2)
  4: RTS (request to send)  9: test                      14: TXD (2)
  5: CTS (clear to send)   10: test                      15: DCE

 16: RXD (2)  21: signal quality detector
 17: RX clock 22: RI (ring indicator)
 18: N/C      23: data signal rate detector
 19: RTS (2)  24: DTE
 20: DTR      25: N/C


TXD (pin 2) has data going from the terminal to the computer at 0-5V
TXD2 (pin 14) has data going from the terminal to the computer at 0-1.5V

DB9 pinout:

  -----------------------
  \ (1) (2) (3) (4) (5) /
   \  (6) (7) (8) (9)  /
    \_________________/

1: DCD 4: DTR 7: RTS
2: RXD 5: GND 8: CTS
3: TXD 6: DSR 9: RI

Wiring:
-------

DB25                    DB9
-------------------------------------------------------------------
   1 (shield)          -> shield (the metal bit around the connector)
   2 (TXD)             -> 2 (RXD)
   3 (RXD) + 16 (RXD2) -> 3 (TXD)
   4 (RTS)             -> 8 (CTS)
   5 (CTS)             -> 7 (RTS)
   6 (DSR) + 8 (DCD)   -> 4 (DTR)
   7 (GND)             -> 5 (GND)
  20 (DTR)             -> 1 (DCD) + 6 (DSR)

DIP switch settings

   1 2 3 4 5 6 7 8 9 10
   _ _ _ _ _ _ _ _ _ _
1 | | | | | | | | | | |
0 |_|_|_|_|_|_|_|_|_|_|
   | | | | | | | | | |
   | | | | | | | | | `- beep on keypress
   | | | | | | | | `- ??
   | | | | | | | `- baud rate 1
   | | | | | | `- baud rate 2
   | | | | | `- baud rate 3
   | | | | `- bits per character?
   | | | `- bits per character?
   | | `- vertical wrap (if in the down position, 
   | |                   going past line 24 wraps back to line 1, 
   | |                   effectively disabling scrolling and messing 
   | |                   up all sorts of stuff for most stuff expecting
   | |                   normal terminal behavior.)
   | `- local echo (up=off, down=on)
   `- Test mode (runs test loops)

Need some further testing, but I believe bits 4 and 5 switch between 7 or 8 bits per character separately for sending and receiving.

Baud rate configuration switches

     .---- baud rate 3   (switch 6)
    / .--- baud rate 2  (switch 7)
   / / .-- baud rate 1 (switch 8)
  / / /
 0 0 0          300 baud
 0 0 1          600 baud
 0 1 0         1200 baud
 0 1 1         1800 baud
 1 0 0         2400 baud
 1 0 1         4800 baud
 1 1 0         9600 baud
 1 1 1        19200 baud